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<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="eAI6m0H3HEDyXJzLHWtH76L6MBWjdluX38Ij0qdlmGikiNdRyjTEj4gij51Fkz05">
<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="eAI6m0H3HEDyXJzLHWtH76L6MBWjdluX38Ij0qdlmGikiNdRyjTEj4gij51Fkz05">
<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="eAI6m0H3HEDyXJzLHWtH76L6MBWjdluX38Ij0qdlmGikiNdRyjTEj4gij51Fkz05">
<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="eAI6m0H3HEDyXJzLHWtH76L6MBWjdluX38Ij0qdlmGikiNdRyjTEj4gij51Fkz05">
<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="eAI6m0H3HEDyXJzLHWtH76L6MBWjdluX38Ij0qdlmGikiNdRyjTEj4gij51Fkz05">
<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="28928205">
<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://journals.asm.org/doi/10.1128/mBio.00443-17?url_ver=Z39.88-2003&amp;rfr_id=ori:rid:crossref.org&amp;rfr_dat=cr_pub 0pubmed"
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ref="linksrc=fulltextorjournal_fulltext&amp;is_pmc=False&amp;PrId=4487&amp;itool=Abstract-def&amp;log$=linkouticon&amp;uid=28928205&amp;db=pubmed&amp;nlmid=101519231"
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Atypon
</span></a><a class="link-item
pmc
"
href="https://pmc.ncbi.nlm.nih.gov/articles/pmid/28928205/"
target="_blank"
rel="noopener"
ref="linksrc=fulltextorjournal_fulltext&amp;is_pmc=True&amp;PrId=3494&amp;itool=Abstract-def&amp;log$=linkouticon&amp;uid=28928205&amp;db=pubmed&amp;nlmid=101519231"
title="Free full text at PubMed Central"
data-ga-category="full_text"
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Free PMC article
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</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="/28928205/citations/"
data-citation-style="nlm"
data-pubmed-format-link="/28928205/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="28928205" 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%2F28928205%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="eAI6m0H3HEDyXJzLHWtH76L6MBWjdluX38Ij0qdlmGikiNdRyjTEj4gij51Fkz05"><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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BolA Is Required for the Accurate Regulation of c-di-GMP, a Central Player in Biofilm Formation
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><sup class="key">1</sup> Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Oeiras, Portugal rnmoreira@itqb.unl.pt cecilia@itqb.unl.pt.</li>
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><sup class="key">2</sup> Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Oeiras, Portugal.</li>
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><sup class="key">3</sup> Research Core Unit Metabolomics and Institute of Pharmacology, Hannover Medical School, Hannover, Germany.</li>
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><sup class="key">4</sup> Biozentrum of the University of Basel, Basel, Switzerland.</li>
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Abstract
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<p>
The bacterial second messenger cyclic dimeric GMP (c-di-GMP) is a nearly ubiquitous intracellular signaling molecule involved in the transition from the motile to the sessile/biofilm state in bacteria. C-di-GMP regulates various cellular processes, including biofilm formation, motility, and virulence. BolA is a transcription factor that promotes survival in different stresses and is also involved in biofilm formation. Both BolA and c-di-GMP participate in the regulation of motility mechanisms leading to similar phenotypes. Here, we establish the importance of the balance between these two factors for accurate regulation of the transition between the planktonic and sessile lifestyles. This balance is achieved by negative-feedback regulation of BolA and c-di-GMP. BolA not only contributes directly to the motility of bacteria but also regulates the expression of diguanylate cyclases and phosphodiesterases. This expression modulation influences the synthesis and degradation of c-di-GMP, while this signaling metabolite has a negative influence in <i>bolA</i> mRNA transcription. Finally, we present evidence of the dominant role of BolA in biofilm, showing that, even in the presence of elevated c-di-GMP levels, biofilm formation is reduced in the absence of BolA. C-di-GMP is one of the most important bacterial second messengers involved in several cellular processes, including virulence, cell cycle regulation, biofilm formation, and flagellar synthesis. In this study, we unravelled a direct connection between the <i>bolA</i> morphogene and the c-di-GMP signaling molecule. We show the important cross-talk that occurs between these two molecular regulators during the transition between the motile/planktonic and adhesive/sessile lifestyles in <i>Escherichia coli</i> This work provides important clues that can be helpful in the development of new strategies, and the results can be applied to other organisms with relevance for human health.<b>IMPORTANCE</b> Bacterial cells have evolved several mechanisms to cope with environmental stresses. BolA-like proteins are widely conserved from prokaryotes to eukaryotes, and in <i>Escherichia coli</i>, in addition to its pleiotropic effects, this protein plays a determinant role in bacterial motility and biofilm formation regulation. Similarly, the bacterial second messenger c-di-GMP is a molecule with high importance in coordinating the switch between planktonic and sessile life in bacteria. Here we have unravelled the importance of accurate regulation of cross-talk between BolA and c-di-GMP for a proper response in the regulation of these bacterial lifestyles. This finding underlines the complexity of bacterial cell regulation, revealing the existence of one additional tool for fine-tuning such important cellular molecular mechanisms. The relationship between BolA and c-di-GMP gives new perspectives regarding biofilm formation and opens the possibility to extend our studies to other organisms with relevance for human health.
</p>
</div>
<p>
<strong class="sub-title">
Keywords:
</strong>
BolA; biofilm; c-di-GMP; diguanylate cyclase; motility; phosphodiesterase.
</p>
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Copyright © 2017 Moreira et al.
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<div class="figures" id="figures">
<h2 class="title">
Figures
</h2>
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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/e73b/5605933/18ef6ccd5cc5/mbo0041734890001.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-0"
role="button"
data-image-width="800"
data-image-height="1799"
data-image-alt="FIG 1"
data-pmc-id="PMC5605933"
data-figure-id="fig1">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-0"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e73b/5605933/e9b023fab7d9/mbo0041734890001.gif"
alt="FIG 1" />
</a>
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<div class="caption-wrap">
<strong class="figure-label">
<p> FIG 1 </p>
</strong>
<div class="figure-caption-contents"><p> Influence of BolA in cell… </p></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIG 1 </p>
</strong>
<div class="figure-caption-contents"><p> Influence of BolA in cell motility and c-di-GMP regulation. (A) To measure motility,… </p></div>
</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
</strong>
<div class="figure-caption-contents">Influence of BolA in cell motility and c-di-GMP regulation. (A) To measure motility, bacteria were inoculated in swimming agar plates. The plates were incubated at 37°C for 17 h and pictures were taken using ImageScanner III (GE Healthcare Life Sciences). Significant differences, relative to the wt strain, were determined by measuring the diameter of the swimming halo. ****, <i>P</i> &lt; 0,0001 (analysis of variance [ANOVA] test). (B) Quantification of c-di-GMP metabolite in bacteria expressing different amounts of BolA. In the absence of BolA, the c-di-GMP concentration in the cells was increased about 1.7-fold. In the presence of high levels of this protein, the c-di-GMP concentration was reduced. ****, <i>P</i> ≤ 0.0001 (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/e73b/5605933/386a0c70fe6f/mbo0041734890002.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-1"
role="button"
data-image-width="800"
data-image-height="602"
data-image-alt="FIG 2"
data-pmc-id="PMC5605933"
data-figure-id="fig2">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-1"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e73b/5605933/1c82c2c6d6b7/mbo0041734890002.gif"
alt="FIG 2" />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="800">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="602">
<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> FIG 2 </p>
</strong>
<div class="figure-caption-contents"><p> Validation of microarrays results by… </p></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIG 2 </p>
</strong>
<div class="figure-caption-contents"><p> Validation of microarrays results by RT-PCR and analysis of BolA effect on the… </p></div>
</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
</strong>
<div class="figure-caption-contents">Validation of microarrays results by RT-PCR and analysis of BolA effect on the intracellular c-di-GMP levels in <i>ydaM</i> and <i>yhjH</i> knockout mutants. (A) The levels of several DGCs and PDEs differentially regulated by BolA were determined to validate the data from the microarrays. In all reactions, 50 ng of total RNA that had been extracted 3 h after the addition of arabinose to the media was used. The results of parallel RT-PCR procedures run in the absence of reverse transcriptase yielded no product. The results of RT-PCR performed with primers specific for 16S rRNA showed that there were no significant variations in the amount of RNA used in each sample. The images are representative of results from at least three independent RT-PCR experiments performed with RNAs from two different extractions. (B and C) A <i>bolA ydaM</i> double mutant showed a reversion effect on the elevated levels of c-di-GMP caused by a single <i>bolA</i> mutation (B). In the <i>bolA</i><sup>++</sup> strain lacking the <i>yhjH</i> gene, inhibition of c-di-GMP production was retained (C). Both observations indicate a modulation of c-di-GMP levels dependent on BolA through the regulation of <i>ydaM</i> and <i>yhjH</i> gene expression. ****, <i>P</i> ≤ 0.0001 (one-way ANOVA test).</div>
</figcaption>
</figure>
<figure class="figure-item "
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="2"
data-label-slug="fig-3">
<a class="figure-link"
href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e73b/5605933/5e422dbe3a11/mbo0041734890003.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-2"
role="button"
data-image-width="742"
data-image-height="783"
data-image-alt="FIG 3"
data-pmc-id="PMC5605933"
data-figure-id="fig3">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-2"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e73b/5605933/c967a366ef56/mbo0041734890003.gif"
alt="FIG 3" />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="742">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="783">
<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> FIG 3 </p>
</strong>
<div class="figure-caption-contents"><p> Real-time biolayer interferometry measurement of… </p></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIG 3 </p>
</strong>
<div class="figure-caption-contents"><p> Real-time biolayer interferometry measurement of 0.5, 1.0, and 1.5 M BolA in immobilized… </p></div>
</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
</strong>
<div class="figure-caption-contents">Real-time biolayer interferometry measurement of 0.5, 1.0, and 1.5 M BolA in immobilized substrate. BolA association and dissociation data are labeled and represented by the dashed red line. BSA protein and <i>flhDC</i> promoter sequence were used as negative controls.</div>
</figcaption>
</figure>
<figure class="figure-item "
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="3"
data-label-slug="fig-4">
<a class="figure-link"
href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e73b/5605933/a58769add69d/mbo0041734890004.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-3"
role="button"
data-image-width="800"
data-image-height="674"
data-image-alt="FIG 4"
data-pmc-id="PMC5605933"
data-figure-id="fig4">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-3"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e73b/5605933/c5a304a0b25b/mbo0041734890004.gif"
alt="FIG 4" />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="800">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="674">
<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> FIG 4 </p>
</strong>
<div class="figure-caption-contents"><p> Motility assay of a wt… </p></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIG 4 </p>
</strong>
<div class="figure-caption-contents"><p> Motility assay of a wt strain growing in LB and in LB supplemented… </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
</strong>
<div class="figure-caption-contents">Motility assay of a wt strain growing in LB and in LB supplemented with 10 µM c-di-GMP, cGMP, GTP, pGpG, or guanosine. When growth medium was supplemented with c-di-GMP, similar effects of elevated intracellular levels of this metabolite were observed, representing inhibition of bacterial motility. The same effect was observed when the medium was supplemented with cGMP, GTP, and guanosine but not when it was supplemented with pGpG. cAMP, a metabolite that is not related to c-di-GMP, was used as negative control under the same conditions. Significant differences were determined by measuring the swimming halo diameter after 10 h of growth. ****, <i>P</i> &lt; 0.0001 (one-way ANOVA 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">
<a class="figure-link"
href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e73b/5605933/87414021a2ad/mbo0041734890005.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-4"
role="button"
data-image-width="800"
data-image-height="663"
data-image-alt="FIG 5"
data-pmc-id="PMC5605933"
data-figure-id="fig5">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-4"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e73b/5605933/6f75033e1621/mbo0041734890005.gif"
alt="FIG 5" />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="800">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="663">
<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> FIG 5 </p>
</strong>
<div class="figure-caption-contents"><p> Influence of c-di-GMP in the… </p></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIG 5 </p>
</strong>
<div class="figure-caption-contents"><p> Influence of c-di-GMP in the transcription of <i> bolA </i> . (A and B) <i> bolA… </i> </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
</strong>
<div class="figure-caption-contents">Influence of c-di-GMP in the transcription of <i>bolA</i>. (A and B) <i>bolA</i> mRNA relative expression levels determined by qRT-PCR. Samples in the exponential (A) and stationary (B) phases of growth were analyzed. The levels of expression of <i>bolA</i> were compared in wt and <i>bolA</i><sup>+</sup> strains in the presence or absence of c-di-GMP. All values are relative to expression of the wt strain in the exponential phase. (C) Graph showing the β-galactosidase activity of a construct with the <i>bolA</i> promoter region. The expression of β-galactosidase was analyzed in the wt strain cultured in LB media or in LB media supplemented with 1 µM c-di-GMP. *, <i>P</i> ≤ 0.05; **, <i>P</i> ≤ 0.01 (Students <i>t</i> test).</div>
</figcaption>
</figure>
<figure class="figure-item "
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="5"
data-label-slug="fig-6">
<a class="figure-link"
href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e73b/5605933/d1bcefd802f6/mbo0041734890006.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-5"
role="button"
data-image-width="700"
data-image-height="551"
data-image-alt="FIG 6"
data-pmc-id="PMC5605933"
data-figure-id="fig6">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-5"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e73b/5605933/84fe9c523c8e/mbo0041734890006.gif"
alt="FIG 6" />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="700">
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<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> FIG 6 </p>
</strong>
<div class="figure-caption-contents"><p> Influence of YdaM and YhjH… </p></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIG 6 </p>
</strong>
<div class="figure-caption-contents"><p> Influence of YdaM and YhjH in the transcription of <i> bolA </i> . (Left) In… </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
</strong>
<div class="figure-caption-contents">Influence of YdaM and YhjH in the transcription of <i>bolA</i>. (Left) In a mutant strain with a deletion of <i>yhjH</i><i>yhjH</i> mutant) and consequently with higher intracellular levels of c-di-GMP, <i>bolA</i> expression was reduced. (Right) When <i>ydaM</i> was deleted, with the concomitant decrease of c-di-GMP levels, expression of <i>bolA</i> mRNA was slightly increased in comparison to the wt strain levels. ***, <i>P</i> ≤ 0.001 (Students <i>t</i> test).</div>
</figcaption>
</figure>
<figure class="figure-item tail"
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="6"
data-label-slug="fig-7">
<a class="figure-link"
href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e73b/5605933/4e4c2b1f5659/mbo0041734890007.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-6"
role="button"
data-image-width="700"
data-image-height="495"
data-image-alt="FIG 7"
data-pmc-id="PMC5605933"
data-figure-id="fig7">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-6"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e73b/5605933/0ce8661587b8/mbo0041734890007.gif"
alt="FIG 7" />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="700">
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<div class="caption-wrap">
<strong class="figure-label">
<p> FIG 7 </p>
</strong>
<div class="figure-caption-contents"><p> Cross-talk between the transcription factor… </p></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIG 7 </p>
</strong>
<div class="figure-caption-contents"><p> Cross-talk between the transcription factor BolA and the second messenger c-di-GMP in bacterial… </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
</strong>
<div class="figure-caption-contents">Cross-talk between the transcription factor BolA and the second messenger c-di-GMP in bacterial biofilm formation. BolA and c-di-GMP are known to be important players in biofilm development. <b>(</b>A<b>)</b> Our model suggests that a negative-feedback modulation, which leads to a balance between these two factors, is needed for a proper physiological response. <b>(</b>B<b>)</b> Additionally, the absence of BolA leads to less-robust biofilm formation, even in the presence of high levels of c-di-GMP, which evidences the determinant function of this protein in the regulation of biofilm formation.</div>
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