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<label for="email-from" class="action-panel-label">
From:
</label>
<input type="email" aria-label="Sender Email Address" placeholder="email@example.com" id="email-from" class="email-from" pattern="^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$" maxlength="256">
</div>
<div class="action-panel-control-wrap">
<label for="email-citation-format" class="action-panel-label">
Format:
</label>
<select id="email-citation-format" name="citation-format" class="action-panel-selector email-citation-format">
<option selected="selected" value="summary">Summary</option>
<option value="summary-text">Summary (text)</option>
<option value="abstract">Abstract</option>
<option value="abstract-text">Abstract (text)</option>
</select>
</div>
<div class="include-supplemental-container">
<input type="checkbox" aria-label="Include MeSH and other data" name="include-supplemental" id="email-include-supplemental" class="email-include-supplemental">
<label for="email-include-supplemental" class="email-include-supplemental-label">MeSH and other data</label>
</div>
<div class="form-field recaptcha ">
<div class="g-recaptcha" id="id-recaptcha" data-sitekey="6LfsWHMdAAAAAClKbtOpjQ2pMjgsGxvv7NdZW9uI"></div>
</div>
<div id="captcha-error-message" class="usa-input-error-message captcha-validation-message" role="alert"></div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Sending..."
data-ga-category="save_share"
data-ga-action="email"
data-ga-label="send">
Send email
</button>
<button class="action-panel-cancel"
aria-label="Close 'Email citations' panel"
ref="linksrc=close_email_panel"
aria-controls="email-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="email"
data-ga-label="cancel">
Cancel
</button>
</div>
<input type="hidden" name="email-search-details" value="" />
<input type="hidden" name="email-search-details-hash" value="0e42663a6c3bd85498fcb88798998fed7bfdc45d457db35281e41afe13cc0524" />
</form>
</div>
</div>
<div id="collections-action-panel"
class="collections-action-panel action-panel in-progress-dots-panel"
aria-hidden="true"
data-collections-open-panel-enabled="false"
data-collections-open-panel-url-hash="#open-collections-panel">
<div class="inner-wrap">
<h3 class="action-panel-heading">
Add to Collections
</h3>
<form id="collections-action-panel-form"
class="collections-action-panel-form action-panel-content action-form action-panel-smaller-selectors"
data-existing-collections-url="/list-existing-collections/"
data-add-to-existing-collection-url="/add-to-existing-collection/"
data-create-and-add-to-new-collection-url="/create-and-add-to-new-collection/"
data-get-article-ids-by-search-url="/get-article-ids-by-search/"
data-myncbi-max-collection-name-length="100"
data-add-to-collection-max-amount="1000"
data-collections-root-url="https://www.ncbi.nlm.nih.gov/myncbi/collections/">
<input type="hidden" name="csrfmiddlewaretoken" value="bl7ZXEpRqWhgBN6b5JRHOChhSwWXHA550T7cB4V95YW2WRKhW6hE0AMtp01jOOBd">
<div class="choice-group" role="radiogroup">
<ul class="radio-group-items">
<li>
<input type="radio"
id="collections-action-panel-new"
class="collections-new"
name="collections"
value="new"
data-ga-category="save_share"
data-ga-action="collections"
data-ga-label="collections_radio_new">
<label for="collections-action-panel-new">Create a new collection</label>
</li>
<li>
<input type="radio"
id="collections-action-panel-existing"
class="collections-existing"
name="collections"
value="existing"
checked="true"
data-ga-category="save_share"
data-ga-action="collections"
data-ga-label="collections_radio_existing">
<label for="collections-action-panel-existing">Add to an existing collection</label>
</li>
</ul>
</div>
<div class="controls-wrapper">
<div class="action-panel-control-wrap new-collections-controls">
<label for="collections-action-panel-add-to-new" class="action-panel-label required-field-asterisk">
Name your collection:
</label>
<input
type="text"
name="add-to-new-collection"
id="collections-action-panel-add-to-new"
class="collections-action-add-to-new"
pattern="[^&quot;&amp;=&lt;&gt;\/]*" title="The following characters are not allowed in the Name field: &quot;&amp;=&lt;&gt;/"
maxlength="100"
data-ga-category="save_share"
data-ga-action="create_collection"
data-ga-label="non_favorties_collection">
<div class="collections-new-name-too-long usa-input-error-message selection-validation-message">
Name must be less than 100 characters
</div>
</div>
<div class="action-panel-control-wrap existing-collections-controls">
<label for="collections-action-panel-add-to-existing" class="action-panel-label">
Choose a collection:
</label>
<select id="collections-action-panel-add-to-existing"
class="action-panel-selector collections-action-add-to-existing"
data-ga-category="save_share"
data-ga-action="select_collection"
data-ga-label="($('#collections-action-add-to-existing').val() === 'Favorites') ? 'Favorites' : 'non_favorites_collection'">
</select>
<div class="collections-retry-load-on-error usa-input-error-message selection-validation-message">
Unable to load your collection due to an error<br>
<a href="#">Please try again</a>
</div>
</div>
</div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Adding..."
data-pinger-ignore
data-ga-category="save_share"
data-ga-action="collections"
data-ga-label="add">
Add
</button>
<button class="action-panel-cancel"
aria-label="Close 'Add to Collections' panel"
ref="linksrc=close_collections_panel"
aria-controls="collections-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="collections"
data-ga-label="cancel">
Cancel
</button>
</div>
</form>
</div>
</div>
<div id="bibliography-action-panel"
class="bibliography-action-panel action-panel in-progress-dots-panel"
aria-hidden="true"
data-bibliography-open-panel-enabled="false"
data-bibliography-open-panel-url-hash="#open-bibliography-panel">
<div class="inner-wrap">
<h3 class="action-panel-heading">
Add to My Bibliography
</h3>
<form id="bibliography-action-panel-form"
class="bibliography-action-panel-form action-panel-content action-form action-panel-smaller-selectors"
data-add-to-bibliography-max-amount="100"
data-add-to-bibliography-batch-size="10"
data-bibliography-delegates-url="/list-bibliography-delegates/"
data-add-to-bibliography-url="/add-to-bibliography/"
data-get-article-ids-by-search-url="/get-article-ids-by-search/"
data-mybib-root-url="https://www.ncbi.nlm.nih.gov/myncbi/collections/mybibliography/">
<input type="hidden" name="csrfmiddlewaretoken" value="bl7ZXEpRqWhgBN6b5JRHOChhSwWXHA550T7cB4V95YW2WRKhW6hE0AMtp01jOOBd">
<div class="action-panel-control-wrap bibliographies-controls">
<div class="choice-group">
<ul class="bibliographies-action-add radio-group-items">
<li>
<input name="bibliography" id="my-bibliography" class="my-bibliography" type="radio" checked/>
<label for="my-bibliography">My Bibliography</label>
</li>
</ul>
</div>
</div>
<div class="bibliographies-retry-load-on-error usa-input-error-message selection-validation-message">
Unable to load your delegates due to an error<br>
<a href="#">Please try again</a>
</div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Adding..."
data-pinger-ignore>
Add
</button>
<button class="action-panel-cancel"
aria-label="Close 'Add to bibliography' panel"
ref="linksrc=close_bibliography_panel"
aria-controls="bibliography-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="mybib"
data-ga-label="cancel">
Cancel
</button>
</div>
</form>
</div>
</div>
<div id="saved-search-action-panel" class="saved-search-action-panel action-panel " aria-hidden="true"
data-saved-search-open-panel-enabled="false"
data-saved-search-open-panel-url-hash="#open-saved-search-panel">
<div class="inner-wrap">
<h2 class="action-panel-heading">
Your saved search
</h2>
<form id="saved-search-action-panel-form"
class="saved-search-action-panel-form action-panel-content action-form"
data-create-saved-search-url="/create-saved-search/"
data-try-search-terms-url="/try-search-term/"
data-saved-search-root-url="https://www.ncbi.nlm.nih.gov/myncbi/searches/">
<input type="hidden" name="csrfmiddlewaretoken" value="bl7ZXEpRqWhgBN6b5JRHOChhSwWXHA550T7cB4V95YW2WRKhW6hE0AMtp01jOOBd">
<div class="action-panel-control-wrap">
<label for="saved-search-name" class="action-panel-label saved-search-name-label required-field-asterisk">
Name of saved search:
</label>
<input maxlength="200"
type="text"
name="saved-search-name"
id="saved-search-name"
class="saved-search-name"
value=""
required
pattern="[^&quot;&amp;=&lt;&gt;\/]*" title="The following characters are not allowed in the Name field: &quot;&amp;=&lt;&gt;/">
</div>
<div class="action-panel-control-wrap">
<label for="saved-search-term" class="action-panel-label required-field-asterisk">
Search terms:
</label>
<textarea name="saved-search-term" id="saved-search-term" class="saved-search-term" required></textarea>
</div>
<div class="test-search-term-wrap">
<a href="#" class="try-search-term">Test search terms</a>
</div>
<div class="choice-group action-panel-extra-margin-top">
<span class="action-panel-label" id="fieldset-label">
Would you like email updates of new search results?
</span>
<fieldset id="saved-search-alert" aria-describedby="fieldset-label">
<legend class="usa-sr-only">Saved Search Alert Radio Buttons</legend>
<ul class="radio-group-items">
<li>
<input type="radio" id="saved-search-alert-yes" class="saved-search-alert-yes" name="saved-search-alert" value="yes" checked>
<label for="saved-search-alert-yes" class="action-panel-label">Yes</label>
</li>
<li>
<input aria-label="No radio input" type="radio" id="saved-search-alert-no" class="saved-search-alert-no" name="saved-search-alert" value="no">
<label for="saved-search-alert-no" class="action-panel-label">No</label>
</li>
</ul>
</fieldset>
</div>
<div class="alert-schedule-wrap">
<div class="action-panel-control-wrap">
<label class="action-panel-label">
Email:
</label>
<span aria-label="Email address" id="saved-search-email" class="action-panel-label"><span class="action-panel-label-bold"></span> (<a class="myncbi-account-settings" href="https://www.ncbi.nlm.nih.gov/account/settings/">change</a>)</span>
</div>
<div class="action-panel-control-wrap action-panel-extra-margin-top">
<label for="saved-search-frequency" class="action-panel-label">
Frequency:
</label>
<select id="saved-search-frequency" class="no-border-panel-selector saved-search-frequency">
<option value="monthly">Monthly</option>
<option value="weekly">Weekly</option>
<option value="daily">Daily</option>
</select>
</div>
<div class="action-panel-control-wrap saved-search-monthly-additional">
<label for="saved-search-monthly-on-day" class="action-panel-label">
Which day?
</label>
<select id="saved-search-monthly-on-day" class="no-border-panel-selector">
<option value="Sunday">The first Sunday</option>
<option value="Monday">The first Monday</option>
<option value="Tuesday">The first Tuesday</option>
<option value="Wednesday">The first Wednesday</option>
<option value="Thursday">The first Thursday</option>
<option value="Friday">The first Friday</option>
<option value="Saturday">The first Saturday</option>
<option value="day">The first day</option>
<option value="weekday">The first weekday</option>
</select>
</div>
<div class="action-panel-control-wrap saved-search-weekly-additional">
<label for="saved-search-weekly-on-day" class="action-panel-label">
Which day?
</label>
<select id="saved-search-weekly-on-day" class="no-border-panel-selector saved-search-weekly-on-day">
<option value="Sunday">Sunday</option>
<option value="Monday">Monday</option>
<option value="Tuesday">Tuesday</option>
<option value="Wednesday">Wednesday</option>
<option value="Thursday">Thursday</option>
<option value="Friday">Friday</option>
<option value="Saturday">Saturday</option>
</select>
</div>
<div class="action-panel-control-wrap">
<label for="saved-search-report" class="action-panel-label">
Report format:
</label>
<select id="saved-search-report" class="no-border-panel-selector saved-search-report">
<option value="DocSum">Summary</option>
<option value="DocSumText">Summary (text)</option>
<option value="Abstract">Abstract</option>
<option value="AbstractText">Abstract (text)</option>
<option value="MEDLINE">PubMed</option>
</select>
</div>
<div class="action-panel-control-wrap">
<label for="saved-search-amount" class="action-panel-label">
Send at most:
</label>
<select id="saved-search-amount" class="no-border-panel-selector saved-search-amount">
<option value="1">1 item</option>
<option value="5" selected>5 items</option>
<option value="10">10 items</option>
<option value="20">20 items</option>
<option value="50">50 items</option>
<option value="100">100 items</option>
<option value="200">200 items</option>
</select>
</div>
<div>
<input type="checkbox" id="saved-search-send-if-no-result" class="saved-search-send-if-no-result" name="saved-search-send-if-no-result">
<label for="saved-search-send-if-no-result" class="action-panel-label smaller-checkbox">
Send even when there aren't any new results
</label>
</div>
<div class="action-panel-control-wrap option-text-in-email-wrap">
<label for="saved-search-email-text" class="action-panel-label">
Optional text in email:
</label>
<textarea name="saved-search-email-text"
id="saved-search-email-text"
class="saved-search-email-text"></textarea>
</div>
</div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Saving..."
data-ga-category="save_share"
data-ga-action="alert"
data-ga-label="save">
Save
</button>
<button class="action-panel-cancel"
aria-label="Close 'Your saved search' panel"
ref="linksrc=close_saved_search_panel"
aria-controls="saved-search-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="alert"
data-ga-label="cancel">
Cancel
</button>
</div>
</form>
</div>
</div>
<div id="citation-manager-action-panel" class="citation-manager-action-panel action-panel" aria-hidden="true">
<div class="inner-wrap">
<h2 class="action-panel-heading">
Create a file for external citation management software
</h2>
<form id="citation-manager-action-panel-form"
class="action-panel-content action-form"
action="/results-export-ids/"
data-by-search-action="/results-export-search-data/"
data-by-ids-action="/results-export-ids/"
method="post"
data-by-search-method="post"
data-by-ids-method="post">
<input type="hidden" name="csrfmiddlewaretoken" value="bl7ZXEpRqWhgBN6b5JRHOChhSwWXHA550T7cB4V95YW2WRKhW6hE0AMtp01jOOBd">
<input name="results-format" type="hidden" value="pubmed"/>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Sending..."
data-ga-category="save_share"
data-ga-action="citation_manager"
data-ga-label="save">
Create file
</button>
<button class="action-panel-cancel"
aria-label="Close 'Send citations to citation manager' panel"
ref="linksrc=close_citation_manager_panel"
aria-controls="citation-manager-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="citation_manager"
data-ga-label="cancel">
Cancel
</button>
</div>
</form>
</div>
</div>
<div id="rss-action-panel" class="rss-action-panel action-panel " aria-hidden="true">
<div class="inner-wrap">
<h2 class="action-panel-heading">
Your RSS Feed
</h2>
<form id="rss-action-panel-form"
class="rss-action-panel-form action-panel-content action-form"
data-create-rss-feed-url="/create-rss-feed-url/"
data-search-form-term-value="">
<input type="hidden" name="csrfmiddlewaretoken" value="bl7ZXEpRqWhgBN6b5JRHOChhSwWXHA550T7cB4V95YW2WRKhW6hE0AMtp01jOOBd">
<div class="action-panel-control-wrap">
<label for="rss-name" class="action-panel-label required-field-asterisk">
Name of RSS Feed:
</label>
<input maxlength="200"
placeholder="Name"
type="text"
name="rss-name"
id="rss-name"
class="rss-name"
value=''
required
pattern="[^&quot;&amp;=&lt;&gt;\/]*" title="The following characters are not allowed in the Name field: &quot;&amp;=&lt;&gt;/">
</div>
<div class="rss-limit-wrap">
<div class="action-panel-control-wrap action-panel-extra-margin-top">
<label for="rss-limit" class="action-panel-label">
Number of items displayed:
</label>
<select id="rss-limit" class="no-border-panel-selector rss-limit">
<option value="5">5</option>
<option value="10">10</option>
<option value="15" selected="selected">15</option>
<option value="20">20</option>
<option value="50">50</option>
<option value="100">100</option>
</select>
</div>
</div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Creating..."
data-ga-category="save_share"
data-ga-action="alert"
data-ga-label="save">
Create RSS
</button>
<button class="action-panel-cancel"
aria-label="Close 'Your RSS' panel"
ref="linksrc=close_rss_panel"
aria-controls="rss-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="alert"
data-ga-label="cancel">
Cancel
</button>
</div>
<div class="action-panel-control-wrap rss-link-copy-wrap">
<label for="rss-link" class="usa-sr-only">RSS Link</label>
<input placeholder="Your RSS Feed Link" type="text" name="rss-link" id="rss-link" class="rss-link" title="RSS Link">
<button
type="button"
disabled
class="rss-link-copy-button disabled"
data-ga-category="save_share"
data-ga-action="rss"
data-ga-label="copy">
Copy
</button>
</div>
</form>
</div>
</div>
</div>
</div>
<div class="article-page" id="article-page" data-article-pmid="34265024">
<aside class="page-sidebar">
<div class="inner-wrap">
<div class="full-text-links">
<div class="full-view">
<h3 class="title">
Full text links
</h3>
<div class="full-text-links-list">
<a class="link-item
dialog-focus"
href="https://dx.plos.org/10.1371/journal.ppat.1009725"
target="_blank"
rel="noopener"
ref="linksrc=fulltextorjournal_fulltext&amp;is_pmc=False&amp;PrId=4656&amp;itool=Abstract-def&amp;log$=linkouticon&amp;uid=34265024&amp;db=pubmed&amp;nlmid=101238921"
title="See full text options at Public Library of Science"
data-ga-category="full_text"
data-ga-action="Public Library of Science"
data-ga-label="34265024"
><img src="https://cdn.ncbi.nlm.nih.gov/corehtml/query/egifs/https:--journals.plos.org-resource-img-external-ppat_120x30.png" alt="Public Library of Science full text link"><span class="text">
Public Library of Science
</span></a><a class="link-item
pmc
"
href="https://pmc.ncbi.nlm.nih.gov/articles/pmid/34265024/"
target="_blank"
rel="noopener"
ref="linksrc=fulltextorjournal_fulltext&amp;is_pmc=True&amp;PrId=3494&amp;itool=Abstract-def&amp;log$=linkouticon&amp;uid=34265024&amp;db=pubmed&amp;nlmid=101238921"
title="Free full text at PubMed Central"
data-ga-category="full_text"
data-ga-action="PMC"
data-ga-label="34265024"
><span class="text">
Free PMC article
</span></a>
</div>
</div>
<div class="short-view">
<a href="#" class="full-text-links-button full-text-links-dialog-trigger">
Full text links
</a>
</div>
</div>
<div class="actions-buttons sidebar"><h3 class="title">Actions</h3><div class="inner-wrap"><button class="citation-button citation-dialog-trigger"
aria-label="Open dialog with citation text in different styles"
data-ga-category="save_share"
data-ga-action="cite"
data-ga-label="open"
data-all-citations-url="/34265024/citations/"
data-citation-style="nlm"
data-pubmed-format-link="/34265024/export/"><span class="button-label">Cite</span></button><link type="text/css" href="ncbi-overlay-block/src/overlay-block.css"><div class="collections-button-container" data-article-id="34265024" data-article-db="pubmed"><button class="collections-button collections-dialog-trigger"
aria-label="Save article in MyNCBI collections."
data-ga-category="collections_button"
data-ga-action="click"
data-ga-label="collections_button"
data-collections-open-dialog-enabled="false"
data-collections-open-dialog-url="https://account.ncbi.nlm.nih.gov/?back_url=https%3A%2F%2Fpubmed.ncbi.nlm.nih.gov%2F34265024%2F%23open-collections-dialog"
data-in-collections="false"><span class="button-label">Collections</span></button><div class="overlay" role="dialog"><div id="collections-action-dialog"
class="dialog collections-dialog"
aria-hidden="true"><div class="title">Add to Collections</div><div class="collections-action-panel action-panel"><form id="collections-action-dialog-form"
class="collections-action-panel-form action-panel-content action-form action-panel-smaller-selectors"
data-existing-collections-url="/list-existing-collections/"
data-add-to-existing-collection-url="/add-to-existing-collection/"
data-create-and-add-to-new-collection-url="/create-and-add-to-new-collection/"
data-myncbi-max-collection-name-length="100"
data-collections-root-url="https://www.ncbi.nlm.nih.gov/myncbi/collections/"><input type="hidden" name="csrfmiddlewaretoken" value="bl7ZXEpRqWhgBN6b5JRHOChhSwWXHA550T7cB4V95YW2WRKhW6hE0AMtp01jOOBd"><div class="choice-group" role="radiogroup"><ul class="radio-group-items"><li><input type="radio"
id="collections-action-dialog-new"
class="collections-new"
name="collections"
value="new"
data-ga-category="collections_button"
data-ga-action="click"
data-ga-label="collections_radio_new"><label for="collections-action-dialog-new">Create a new collection</label></li><li><input type="radio"
id="collections-action-dialog-existing"
class="collections-existing"
name="collections"
value="existing"
checked="true"
data-ga-category="collections_button"
data-ga-action="click"
data-ga-label="collections_radio_existing"><label for="collections-action-dialog-existing">Add to an existing collection</label></li></ul></div><div class="controls-wrapper"><div class="action-panel-control-wrap new-collections-controls"><label for="collections-action-dialog-add-to-new" class="action-panel-label required-field-asterisk">
Name your collection:
</label><input
type="text"
name="add-to-new-collection"
id="collections-action-dialog-add-to-new"
class="collections-action-add-to-new"
pattern="[^&quot;&amp;=&lt;&gt;\/]*" title="The following characters are not allowed in the Name field: &quot;&amp;=&lt;&gt;/"
maxlength="100"
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PlzA is a bifunctional c-di-GMP biosensor that promotes tick and mammalian host-adaptation of Borrelia burgdorferi
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PlzA is a bifunctional c-di-GMP biosensor that promotes tick and mammalian host-adaptation of Borrelia burgdorferi
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><sup class="key">1</sup> Department of Medicine, UConn Health, Farmington, Connecticut, United States of America.</li>
<li data-affiliation-id="short-view-affiliation-2"
id="short-view-affiliation-2"
><sup class="key">2</sup> Department of Pediatrics, UConn Health, Farmington, Connecticut, United States of America.</li>
<li data-affiliation-id="short-view-affiliation-3"
id="short-view-affiliation-3"
><sup class="key">3</sup> Center for Environmental Sciences and Engineering, University of Connecticut, Storrs, Connecticut, United States of America.</li>
<li data-affiliation-id="short-view-affiliation-4"
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><sup class="key">4</sup> Department of Molecular Biology and Biophysics, UConn Health, Farmington, Connecticut, United States of America.</li>
<li data-affiliation-id="short-view-affiliation-5"
id="short-view-affiliation-5"
><sup class="key">5</sup> Department of Genetics and Genome Science, UConn Health, Farmington, Connecticut, United States of America.</li>
<li data-affiliation-id="short-view-affiliation-6"
id="short-view-affiliation-6"
><sup class="key">6</sup> Department of Immunology, UConn Health, Farmington, Connecticut, United States of America.</li>
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<p>
In this study, we examined the relationship between c-di-GMP and its only known effector protein, PlzA, in Borrelia burgdorferi during the arthropod and mammalian phases of the enzootic cycle. Using a B. burgdorferi strain expressing a plzA point mutant (plzA-R145D) unable to bind c-di-GMP, we confirmed that the protective function of PlzA in ticks is c-di-GMP-dependent. Unlike ΔplzA spirochetes, which are severely attenuated in mice, the plzA-R145D strain was fully infectious, firmly establishing that PlzA serves a c-di-GMP-independent function in mammals. Contrary to prior reports, loss of PlzA did not affect expression of RpoS or RpoS-dependent genes, which are essential for transmission, mammalian host-adaptation and murine infection. To ascertain the nature of PlzA's c-di-GMP-independent function(s), we employed infection models using (i) host-adapted mutant spirochetes for needle inoculation of immunocompetent mice and (ii) infection of scid mice with in vitro-grown organisms. Both approaches substantially restored ΔplzA infectivity, suggesting that PlzA enables B. burgdorferi to overcome an early bottleneck to infection. Furthermore, using a Borrelia strain expressing a heterologous, constitutively active diguanylate cyclase, we demonstrate that 'ectopic' production of c-di-GMP in mammals abrogates spirochete virulence and interferes with RpoS function at the post-translational level in a PlzA-dependent manner. Structural modeling and SAXS analysis of liganded- and unliganded-PlzA revealed marked conformational changes that underlie its biphasic functionality. This structural plasticity likely enables PlzA to serve as a c-di-GMP biosensor that in its respective liganded and unliganded states promote vector- and host-adaptation by the Lyme disease spirochete.
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<p xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:p1="http://pubmed.gov/pub-one">The authors have declared that no competing interests exist.</p>
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Figures
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<div class="figures-list" id="slides-container"
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<figure class="figure-item "
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itemprop="associatedMedia"
data-slide-index="0"
data-label-slug="fig-1">
<a class="figure-link"
href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0491/8323883/ee679d5b39f5/ppat.1009725.g001.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-0"
role="button"
data-image-width="690"
data-image-height="484"
data-image-alt="Fig 1"
data-pmc-id="PMC8323883"
data-figure-id="ppat.1009725.g001">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-0"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0491/8323883/4f2962c89aaa/ppat.1009725.g001.gif"
alt="Fig 1" />
</a>
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<div class="caption-wrap">
<strong class="figure-label">
<p> Fig 1. Binding of c-di-GMP by PlzA… </p>
</strong>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> Fig 1. Binding of c-di-GMP by PlzA is essential for survival of <i> B </i> . <i> burgdorferi… </i> </p>
</strong>
</div>
<figcaption id="figure-caption-0" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
Fig 1. Binding of c-di-GMP by PlzA is essential for survival of <i>B</i>. <i>burgdorferi</i> during tick feeding.
</strong>
<div class="figure-caption-contents">(<b>A</b>) Viable spirochete burdens for larvae immersion-fed with B31 A3-68 Δ<i>bbe02</i> (<i>wt</i>), Δ<i>plzA</i>, <i>plzA-R145D</i> and <i>plzA</i>comp strains as determined by colony forming units (CFU). (<b>B</b>) Representative immunofluorescence images of immersion-fed larvae using FITC-conjugated anti-<i>Borrelia</i> antibody. (<b>C</b>) Burdens in immersion-fed larvae determined by qPCR using a TaqMan assay for <i>flaB</i>. Data points in panels <b>A</b> and <b>C</b> represent individual pools of larvae. Error bars indicate the mean ± standard error of the mean for each strain normalized per tick. Asterisks (*) indicate statistical significance (<i>p</i> &lt; 0.05) of all pairwise comparisons determined by unpaired Students <i>t</i>-test.</div>
</figcaption>
</figure>
<figure class="figure-item "
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="1"
data-label-slug="fig-2">
<a class="figure-link"
href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0491/8323883/6725a0bb2e4d/ppat.1009725.g002.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-1"
role="button"
data-image-width="800"
data-image-height="892"
data-image-alt="Fig 2"
data-pmc-id="PMC8323883"
data-figure-id="ppat.1009725.g002">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-1"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0491/8323883/76670402c09d/ppat.1009725.g002.gif"
alt="Fig 2" />
</a>
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<strong class="figure-label">
<p> Fig 2. PlzA deficiency does not impair… </p>
</strong>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> Fig 2. PlzA deficiency does not impair the RpoN/RpoS pathway <i> in vitro </i> or during cultivation… </p>
</strong>
</div>
<figcaption id="figure-caption-1" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
Fig 2. PlzA deficiency does not impair the RpoN/RpoS pathway <i>in vitro</i> or during cultivation in DMCs.
</strong>
<div class="figure-caption-contents">Whole-cell lysates from B31 A3-68 Δ<i>bbe02</i> (<i>wt</i>), Δ<i>plzA</i> and <i>plzA</i>comp strains following temperature-shift <i>in vitro</i> (<b>A</b>) or cultivation within rat peritoneal dialysis membrane chambers (<b>B</b>) were separated by SDS-PAGE and stained with silver or immunoblotted using antisera against PlzA, GlpD, RpoS, OspC, OspA, Lp6.6 or FlaB (loading control). Molecular weight markers (MWM) are shown on the left.</div>
</figcaption>
</figure>
<figure class="figure-item "
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href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0491/8323883/8f59657a1a1b/ppat.1009725.g003.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-2"
role="button"
data-image-width="800"
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data-image-alt="Fig 3"
data-pmc-id="PMC8323883"
data-figure-id="ppat.1009725.g003">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-2"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0491/8323883/91975f520c9f/ppat.1009725.g003.gif"
alt="Fig 3" />
</a>
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<strong class="figure-label">
<p> Fig 3. Constitutive synthesis of c-di-GMP functionally… </p>
</strong>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> Fig 3. Constitutive synthesis of c-di-GMP functionally complements GlpD expression and motility in Δ <i> rrp1… </i> </p>
</strong>
</div>
<figcaption id="figure-caption-2" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
Fig 3. Constitutive synthesis of c-di-GMP functionally complements GlpD expression and motility in Δ<i>rrp1</i> spirochetes <i>in vitro</i>.
</strong>
<div class="figure-caption-contents">(<b>A</b>) Cartoon depiction of the P<sub><i>flaB</i></sub>-<i>slr1143</i>-HA construct encoding a <i>B</i>. <i>burgdorferi</i> codon-optimized, constitutively active Slr1143 diguanylate cyclase (cDGC) from <i>Synechocystis</i> sp. [85]. TSS (+1), transcriptional start site; P<i>flaB</i>, <i>flaB</i> promoter; RBS, ribosome binding site; HA, hemagglutinin tag. (<b>B</b>) Whole-cell lysates of B31 5A18 NP1 (<i>wt</i>), Δ<i>rrp1</i> and <i>cDGC</i> strains grown <i>in vitro</i> following temperature-shift were separated by SDS-PAGE and stained with silver or immunoblotted with antibodies against HA or GlpD. Molecular weight markers (MWM) are shown on the left. (<b>C</b>) c-di-GMP measurements for B31 5A18 NP1 (<i>wt</i>), Δ<i>rrp1</i>, and c<i>DGC</i> strains as determined by LC-MS/MS. Bars represent the mean ± standard error of the mean for three independent cultures per strain. Statistical significance was determined by unpaired Students <i>t</i>-test. Asterisks (*) indicate statistical significance (<i>p</i> ≤ 0.05) of all pairwise comparisons. (<b>D</b>) Growth curves of 5A18 NP1 (<i>wt</i>), Δ<i>rrp1</i> and <i>cDGC</i> strains (in quadruplicate) from a starting density of 1 × 10<sup>3</sup> spirochetes per ml at 37°C. Statistical significance was determined using the CGGC permutation test [122]. Asterisks (*) indicate statistical significance (<i>p</i> ≤ 0.05) of all pairwise comparisons; ns, not significant.</div>
</figcaption>
</figure>
<figure class="figure-item "
itemscope itemtype="http://schema.org/ImageObject"
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data-slide-index="3"
data-label-slug="fig-4">
<a class="figure-link"
href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0491/8323883/d57f1e06b83f/ppat.1009725.g004.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-3"
role="button"
data-image-width="800"
data-image-height="707"
data-image-alt="Fig 4"
data-pmc-id="PMC8323883"
data-figure-id="ppat.1009725.g004">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-3"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0491/8323883/3980227dedb3/ppat.1009725.g004.gif"
alt="Fig 4" />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="800">
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<strong class="figure-label">
<p> Fig 4. Constitutive synthesis of c-di-GMP functionally… </p>
</strong>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> Fig 4. Constitutive synthesis of c-di-GMP functionally complements Δ <i> rrp1 </i> in feeding ticks. </p>
</strong>
<div class="figure-caption-contents"><p> ( <b> A </b> )… </p></div>
</div>
<figcaption id="figure-caption-3" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
Fig 4. Constitutive synthesis of c-di-GMP functionally complements Δ<i>rrp1</i> in feeding ticks.
</strong>
<div class="figure-caption-contents">(<b>A</b>) Viable spirochete burdens in larvae immersion-fed with B31 5A18 NP1 wild-type (<i>wt</i>), Δ<i>rrp1</i> and <i>cDGC</i> strains as determined by colony forming units (CFUs) following semi-solid plating. (<b>B</b>) Representative immunofluorescence images of immersion-fed larvae using FITC-conjugated anti-<i>Borrelia</i> antibody. (<b>C</b>) DNA burdens in immersion fed larvae determined by qPCR using a TaqMan assay for <i>flaB</i>. Data points in panels A and C represent individual pools of ticks. Error bars indicate the mean ± standard error of the mean for each strain normalized per tick. Asterisks (*) indicate statistical significance (<i>p</i> ≤ 0.05) of all pairwise comparisons, as determined by unpaired Students <i>t</i>-test.</div>
</figcaption>
</figure>
<figure class="figure-item "
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="4"
data-label-slug="fig-5">
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href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0491/8323883/3ebdacd86a5b/ppat.1009725.g005.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-4"
role="button"
data-image-width="750"
data-image-height="366"
data-image-alt="Fig 5"
data-pmc-id="PMC8323883"
data-figure-id="ppat.1009725.g005">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-4"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0491/8323883/b2581c146a20/ppat.1009725.g005.gif"
alt="Fig 5" />
</a>
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<div class="caption-wrap">
<strong class="figure-label">
<p> Fig 5. Constitutive synthesis of c-di-GMP antagonizes… </p>
</strong>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> Fig 5. Constitutive synthesis of c-di-GMP antagonizes the RpoN/RpoS pathway in mammalian host-adapted spirochetes. </p>
</strong>
<div class="figure-caption-contents"><p> (… </p></div>
</div>
<figcaption id="figure-caption-4" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
Fig 5. Constitutive synthesis of c-di-GMP antagonizes the RpoN/RpoS pathway in mammalian host-adapted spirochetes.
</strong>
<div class="figure-caption-contents">(<b>A</b>) Whole-cell lysates from B31 5A18 NP1 wild-type (<i>wt</i>), Δ<i>rrp1</i>, and <i>cDGC</i> strains cultivated in DMCs were separated by SDS-PAGE and stained with silver or immunoblotted with antisera against GlpD, PlzA, RpoS, OspC, OspA, Lp6.6 and FlaB (loading control). Molecular weight markers (MWM) are shown on the left. (<b>B</b>) Expression of <i>rpoS</i> determined by qRT-PCR using RNA extracted from <i>wt</i>, Δ<i>rrp1</i> and <i>cDGC</i> strains cultivated in DMCs. Transcript copy numbers for <i>rpoS</i> were normalized using <i>flaB</i>. Statistical significance was determined by unpaired Students <i>t</i>-test. No significance difference (<i>p</i> ≥ 0.05) was observed for any pairwise comparison.</div>
</figcaption>
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itemprop="contentUrl"
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data-pmc-id="PMC8323883"
data-figure-id="ppat.1009725.g006">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-5"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0491/8323883/7f7cad84e633/ppat.1009725.g006.gif"
alt="Fig 6" />
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<strong class="figure-label">
<p> Fig 6. c-di-GMP requires PlzA to antagonize… </p>
</strong>
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</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> Fig 6. c-di-GMP requires PlzA to antagonize RpoS-dependent mammalian host-adaptation. </p>
</strong>
<div class="figure-caption-contents"><p> Whole-cell lysates from wild-type B31… </p></div>
</div>
<figcaption id="figure-caption-5" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
Fig 6. c-di-GMP requires PlzA to antagonize RpoS-dependent mammalian host-adaptation.
</strong>
<div class="figure-caption-contents">Whole-cell lysates from wild-type B31 A3-68 Δ<i>bbe02</i> wild-type (<i>wt</i>), Δ<i>plzA</i>, <i>plzA-R145D</i>, Δ<i>plzA</i>+<i>cDGC</i> and <i>cDGC</i> strains cultivated within DMCs, separated by SDS-PAGE and stained with silver or immunoblotted with antisera against PlzA, GlpD, RpoS, OspC, OspA, Lp6.6, HA, and FlaB (loading control). Molecular weight markers (MWM) are shown on the left.</div>
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<p> Fig 7. Structural analysis of PlzA. </p>
</strong>
<div class="figure-caption-contents"><p> (… </p></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> Fig 7. Structural analysis of PlzA. </p>
</strong>
<div class="figure-caption-contents"><p> ( <b> A </b> ) Kratky plots for liganded (orange) and… </p></div>
</div>
<figcaption id="figure-caption-6" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
Fig 7. Structural analysis of PlzA.
</strong>
<div class="figure-caption-contents">(<b>A</b>) Kratky plots for liganded (orange) and unliganded PlzA (blue). (<b>B</b>) Superposition of the SAXS envelope and refined structural model for liganded-PlzA. The PilZN3 and PilZ β-barrels are colored in salmon and yellow, respectively. The α helices in the PilZN3 and PilZ domains are highlighted in light green and cyan, respectively, while the C-terminal α-helix in PilZN3 is shown in purple. c-di-GMP binding residues in RXXXR and DXSXXG motifs are highlighted in dark green. c-di-GMP (red) was docked into the model using HADDOCK [75].</div>
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data-figure-id="ppat.1009725.g008">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-7"
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<strong class="figure-label">
<p> Fig 8. Proposed model for the function(s)… </p>
</strong>
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</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> Fig 8. Proposed model for the function(s) of liganded- and unliganded-PlzA throughout the enzootic cycle. </p>
</strong>
</div>
<figcaption id="figure-caption-7" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
Fig 8. Proposed model for the function(s) of liganded- and unliganded-PlzA throughout the enzootic cycle.
</strong>
<div class="figure-caption-contents">Global gene expression by <i>B</i>. <i>burgdorferi</i> throughout the enzootic cycle is modulated in large part by the ON and OFF states of two major regulatory networksthe Hk1/Rrp1 two component system and the RpoN/RpoS pathway [3,20,42]. During acquisition, exogenous as yet unidentified small molecules generated during tick feeding activate an Hk1-dependent signaling cascade that culminates in phosphorylation of Rrp1 and synthesis of c-di-GMP [,46]. Binding of c-di-GMP by PlzA (liganded-PlzA) promotes transcription of the <i>glpKFD</i> operon and other tick-phase genes, presumably by binding to an upstream “PlzA box” [38,41,42,53]. At the same time, transcription of <i>rpoS</i> by the BosR/Rrp2/RpoN complex ceases and spirochetes transition from an RpoS-ON to -OFF state [3,20,42]. To expedite the switch from an RpoS-ON to -OFF state, liganded-PlzA interferes with transcription by residual RpoS allosterically by, in essence, acting as a brake on RNAP-RpoS holoenzyme. The absence of <i>rpoS</i>/RpoS within fed larval midguts allows for unfettered expression of RpoD-dependent tick-phase genes (<i>i</i>.<i>e</i>., <i>glps</i>, <i>ospA</i>, <i>lp6</i>.<i>6</i>) that are repressed by RpoS in mammals [36,42,55,61]. During transmission, c-di-GMP signaling also is activated (<i>i</i>.<i>e</i>., ON) in response to tick-specific signals, again allowing for expression of the <i>glp</i> operon and other tick-phase genes that are upregulated by liganded-PlzA [36,38,41,42,45,53]. In contrast to acquisition, however, during transmission, BosR/Rrp2/RpoN-dependent transcription of <i>rpoS</i> is induced [3,20,42], making this the only point within the enzootic cycle when both the c-di-GMP and RpoN/RpoS pathways are ON. Based on findings presented herein, we postulate that the RpoS-brake function of liganded-PlzA prevents RpoS-mediated repression of tick phase genes, which are required for survival within fed midguts, while at the same time allowing transcription of RpoS-upregulated genes required for transmission (<i>i</i>.<i>e</i>., <i>bba64</i>) and/or early infection (<i>i</i>.<i>e</i>., <i>ospC</i>, <i>dbpBA</i>) [36,82,95]. Once within the mammal, loss of c-di-GMP signaling (i) restores RpoSs Gatekeeper function and (ii) enables unliganded-PlzA, working directly or indirectly <i>via</i> an unidentified interactive partner, to assume its alternative, c-di-GMP-independent virulence-related function(s).</div>
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Pathogenicity and virulence of <em>Borrelia burgdorferi</em>.
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<span class="docsum-journal-citation full-journal-citation">Virulence. 2023 Dec;14(1):2265015. doi: 10.1080/21505594.2023.2265015. Epub 2023 Oct 9.</span>
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