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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="nlSjdJVOFm2JTHlLqmgeHZnndRcx86RDcTSwR9r6koHveLZRhJGbTXSzKlhTfknL">
<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="nlSjdJVOFm2JTHlLqmgeHZnndRcx86RDcTSwR9r6koHveLZRhJGbTXSzKlhTfknL">
<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="nlSjdJVOFm2JTHlLqmgeHZnndRcx86RDcTSwR9r6koHveLZRhJGbTXSzKlhTfknL">
<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="nlSjdJVOFm2JTHlLqmgeHZnndRcx86RDcTSwR9r6koHveLZRhJGbTXSzKlhTfknL">
<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="nlSjdJVOFm2JTHlLqmgeHZnndRcx86RDcTSwR9r6koHveLZRhJGbTXSzKlhTfknL">
<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="21990613">
<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.00163-11?url_ver=Z39.88-2003&amp;rfr_id=ori:rid:crossref.org&amp;rfr_dat=cr_pub 0pubmed"
target="_blank"
rel="noopener"
ref="linksrc=fulltextorjournal_fulltext&amp;is_pmc=False&amp;PrId=4487&amp;itool=Abstract-def&amp;log$=linkouticon&amp;uid=21990613&amp;db=pubmed&amp;nlmid=101519231"
title="See full text options at Atypon"
data-ga-category="full_text"
data-ga-action="Atypon"
data-ga-label="21990613"
><img src="https://cdn.ncbi.nlm.nih.gov/corehtml/query/egifs/https:--journals.asm.org-pb-assets-pubmed-mbio-oaicon-pubmed.png" alt="Atypon full text link"><span class="text">
Atypon
</span></a><a class="link-item
pmc
"
href="https://pmc.ncbi.nlm.nih.gov/articles/pmid/21990613/"
target="_blank"
rel="noopener"
ref="linksrc=fulltextorjournal_fulltext&amp;is_pmc=True&amp;PrId=3494&amp;itool=Abstract-def&amp;log$=linkouticon&amp;uid=21990613&amp;db=pubmed&amp;nlmid=101519231"
title="Free full text at PubMed Central"
data-ga-category="full_text"
data-ga-action="PMC"
data-ga-label="21990613"
><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="/21990613/citations/"
data-citation-style="nlm"
data-pubmed-format-link="/21990613/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="21990613" 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%2F21990613%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="nlSjdJVOFm2JTHlLqmgeHZnndRcx86RDcTSwR9r6koHveLZRhJGbTXSzKlhTfknL"><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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Cyclic-di-GMP is a near-ubiquitous bacterial second messenger that is important in localized signal transmission during the control of various processes, including virulence and switching between planktonic and biofilm-based lifestyles. Cyclic-di-GMP is synthesized by GGDEF diguanylate cyclases and hydrolyzed by EAL or HD-GYP phosphodiesterases, with each functional domain often appended to distinct sensory modules. HD-GYP domain proteins have resisted structural analysis, but here we present the first structural representative of this family (1.28 Å), obtained using the unusual Bd1817 HD-GYP protein from the predatory bacterium Bdellovibrio bacteriovorus. Bd1817 lacks the active-site tyrosine present in most HD-GYP family members yet remains an excellent model of their features, sharing 48% sequence similarity with the archetype RpfG. The protein structure is highly modular and thus provides a basis for delineating domain boundaries in other stimulus-dependent homologues. Conserved residues in the HD-GYP family cluster around a binuclear metal center, which is observed complexed to a molecule of phosphate, providing information on the mode of hydroxide ion attack on substrate. The fold and active site of the HD-GYP domain are different from those of EAL proteins, and restricted access to the active-site cleft is indicative of a different mode of activity regulation. The region encompassing the GYP motif has a novel conformation and is surface exposed and available for complexation with binding partners, including GGDEF proteins.
</p>
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Importance:
</strong>
It is becoming apparent that many bacteria use the signaling molecule cyclic-di-GMP to regulate a variety of processes, most notably, transitions between motility and sessility. Importantly, this regulation is central to several traits implicated in chronic disease (adhesion, biofilm formation, and virulence gene expression). The mechanisms of cyclic-di-GMP synthesis via GGDEF enzymes and hydrolysis via EAL enzymes have been suggested by the analysis of several crystal structures, but no information has been available to date for the unrelated HD-GYP class of hydrolases. Here we present the multidomain structure of an unusual member of the HD-GYP family from the predatory bacterium Bdellovibrio bacteriovorus and detail the features that distinguish it from the wider structural family of general HD fold hydrolases. The structure reveals how a binuclear iron center is formed from several conserved residues and provides a basis for understanding HD-GYP family sequence requirements for c-di-GMP hydrolysis.
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id="article-image-0"
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<p> FIG 1 </p>
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<div class="figure-caption-contents"><p> Sequence alignment of <i> B. bacteriovorus… </i> </p></div>
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<p> FIG 1 </p>
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<div class="figure-caption-contents"><p> Sequence alignment of <i> B. bacteriovorus </i> Bd1817 and other HD-GYP proteins. Bacterial strains and… </p></div>
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FIG 1
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<div class="figure-caption-contents">Sequence alignment of <i>B. bacteriovorus</i> Bd1817 and other HD-GYP proteins. Bacterial strains and associated UNIPROT accession codes are as follows: Bd1817 (<i>B. bacteriovorus</i>, Q6MM30, aa 131 to 308), RpfG (<i>Xanthomonas campestris</i>, Q4UU85, aa 180 to 349), PA4108 (<i>Pseudomonas aeruginosa</i>, Q9HWS0, aa 141 to 308), PA4781 (<i>P. aeruginosa</i>, Q9HV27, aa 161 to 344), VCA_0681 (<i>Vibrio cholerae</i>, Q9KLR1, aa 237 to 405), 3,508 bp (<i>Bordetella pertussis</i>, Q7VTL7, aa 14 to 183), KPK_3322 (<i>Klebsiella pneumoniae</i>, B5XSE7, aa 204 to 372), SCO5218 (<i>Streptomyces coelicolor</i>, Q9K4A3, aa 226 to 393), BAS0914 (<i>Bacillus anthracis</i>, Q81UA6, aa 187 to 355). Conserved residues are boxed in white font on a red background, and partially conserved residues are boxed in red font on a white background. Metal-liganding and phosphate-liganded residues are indicated by blue triangles and magenta ovals, respectively. Secondary structure elements for Bd1817 are given above the alignment, corresponding to the HD-GYP domain only. Residue numbering refers to Bd1817, which terminates at L308; the other sequences have been cropped to match the region from A131 to the common DP element preceding α7. This alignment was prepared using T-Coffee (33) and ESPript (34).</div>
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<img class="figure-thumb" itemprop="thumbnail"
id="article-image-1"
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<p> FIG 2 </p>
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<div class="figure-caption-contents"><p> Comparative transcriptional profiling of <i> Bd1817… </i> </p></div>
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<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIG 2 </p>
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<div class="figure-caption-contents"><p> Comparative transcriptional profiling of <i> Bd1817 </i> expression. Lanes AP to 4h contain total RNA… </p></div>
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<figcaption id="figure-caption-1" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
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FIG 2
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<div class="figure-caption-contents">Comparative transcriptional profiling of <i>Bd1817</i> expression. Lanes AP to 4h contain total RNA taken from predatory <i>B. bacteriovorus</i> HD100 attacking <i>E. coli</i> prey cells, i.e., wild-type attack phase cells outside prey (AP) and <i>B. bacteriovorus</i> HD100 wild-type cells that invaded and were replicating inside <i>E. coli</i> prey cells for 15, 30, or 45 min or 1, 2, 3, 4 h. Lanes 1 to 4 contain <i>Bd1817</i> RT-PCR products showing expression levels from matched 10-ng total RNA samples from attack phase <i>Bdellovibrio</i> (lane 1) and axenically grown, independently isolated wild-type HI strains of <i>B. bacteriovorus</i> HD100. Lane 2, strain HID2; lane 3, strain HID13; lane 4, strain HID26. Control lanes are as follows: S17-1, <i>E. coli</i> S17-1 RNA alone; , no-template negative control; +, <i>B. bacteriovorus</i> genomic DNA positive control; L, 100-bp DNA ladder. This figure shows that <i>Bd1817</i> is most highly expressed in the growth and septation phases of the <i>Bdellovibrio</i> axenic and predatory life cycles.</div>
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itemprop="contentUrl"
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data-pmc-id="PMC3188283"
data-figure-id="f3">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-2"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b8a8/3188283/46450cb963b1/mbo0051111720003.gif"
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<p> FIG 3 </p>
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<div class="figure-caption-contents"><p> Electron density of chain A… </p></div>
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<strong class="figure-label">
<p> FIG 3 </p>
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<div class="figure-caption-contents"><p> Electron density of chain A P2 <sub> 1 </sub> <sup> A </sup> crystal form, 1.28-Å resolution data,… </p></div>
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<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
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<div class="figure-caption-contents">Electron density of chain A P2<sub>1</sub><sup>A</sup> crystal form, 1.28-Å resolution data, final refined map at 1.2σ. (a) Binuclear metal-binding site, with bridging hydroxide ion (W1) and tetrahedral ion, modeled as phosphate. (b) Region of GYP motif (glycine 245 and proline 246, “missing” the conserved tyrosine), electron density of aa 237 to 249 demonstrating the ordered nature of the fold.</div>
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itemprop="contentUrl"
aria-describedby="figure-caption-3"
role="button"
data-image-width="666"
data-image-height="141"
data-image-alt="FIG 4"
data-pmc-id="PMC3188283"
data-figure-id="f4">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-3"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b8a8/3188283/a68db5a646f0/mbo0051111720004.gif"
alt="FIG 4" />
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<strong class="figure-label">
<p> FIG 4 </p>
</strong>
<div class="figure-caption-contents"><p> Modular nature of the Bd1817… </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> Modular nature of the Bd1817 HD-GYP protein and active-site coordination of metal ions.… </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">Modular nature of the Bd1817 HD-GYP protein and active-site coordination of metal ions. Selected side chains and bound phosphate are shown in stick form, and metal ions (tan, M1 leftmost and M2 rightmost) and bound hydroxide (red, W1) are shown in sphere form. (a) Ribbon diagram of Bd1817 with individual domains colored separately as follows: NTD (aa 1 to 78), blue; linker helices (aa 79 to 146), yellow; HD-GYP domain (aa 147 to 308), white; lid region subdomain (aa 188 to 211), green; GYP motif subdomain (aa 239 to 255), orange. (b) Detail of binuclear metal active site (HD-GYP domain). Fe-protein interactions, purple dashed lines; hydroxide-protein interaction, green dashed line. (c) Schematic of binuclear metal site with coordination distances shown (taken from chain A of the 1.28-Å P2<sub>1</sub><sup>A</sup> crystal form).</div>
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aria-describedby="figure-caption-4"
role="button"
data-image-width="640"
data-image-height="213"
data-image-alt="FIG 5"
data-pmc-id="PMC3188283"
data-figure-id="f5">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-4"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b8a8/3188283/9253c04e3b4c/mbo0051111720005.gif"
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<strong class="figure-label">
<p> FIG 5 </p>
</strong>
<div class="figure-caption-contents"><p> Features of the NTD. (a)… </p></div>
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<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> Features of the NTD. (a) The Bd1817 NTD (blue) possesses weak structural homology… </p></div>
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FIG 5
</strong>
<div class="figure-caption-contents">Features of the NTD. (a) The Bd1817 NTD (blue) possesses weak structural homology with the Ral-binding domain of Exo84 (cyan; PDB code 1ZC3 [11]), ending at the point where the Bd1817 linker region (yellow) starts. In the P2<sub>1</sub><sup>B</sup> crystal form, residues 11 to 3 of chain B (the polyhistidine tag with the thrombin site left uncleaved [red]) are highly ordered and bind into a cleft formed between the NTD and linker region of chain A. This interaction occurs in a region identical to that of the Exo84 binding partner RalA (magenta), albeit running in different chain directions. (b) Detail of affinity tag-NTD interaction. Selected side chains are shown in stick form.</div>
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role="button"
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<img class="figure-thumb" itemprop="thumbnail"
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src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b8a8/3188283/a3984b4528e3/mbo0051111720006.gif"
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<strong class="figure-label">
<p> FIG 6 </p>
</strong>
<div class="figure-caption-contents"><p> Comparison of the HD-GYP fold… </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> Comparison of the HD-GYP fold with a representative of the wider HD family.… </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">Comparison of the HD-GYP fold with a representative of the wider HD family. Bd1817 (yellow; GYP motif orange) and the HD protein YfbR (PDB code 2PAQ [13]; blue) are shown superimposed, with the HD residues of Bd1817 in stick form and the active-site binuclear metal center in sphere form. It is apparent that all of the α-helices of the HD-GYP fold have counterparts in the generalized HD fold, although α6 sits at an angle different from that of its counterpart in YfbR. The lid region of Bd1817 corresponds to a flexible loop of YfbR (lower left-hand area of image, left unmodeled). Comparatively, the GYP motif of Bd1817 replaces the short interhelical loop of HD proteins (between α4 and α5 equivalents, the 20 residues between Bd1817 aa 236 and 255 contrasting with the 5 residues between YfbR aa 122 and 126).</div>
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<img class="figure-thumb" itemprop="thumbnail"
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<strong class="figure-label">
<p> FIG 7 </p>
</strong>
<div class="figure-caption-contents"><p> Structure of the GYP region… </p></div>
</div>
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<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> Structure of the GYP region of the fold and possible site for c-di-GMP… </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
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<div class="figure-caption-contents">Structure of the GYP region of the fold and possible site for c-di-GMP binding. (a) Detail of the GYP motif (residues 239 to 255; orange), illustrating fold stabilization by the conserved E239 side chain and tightly bound solvent molecule W2 (hydrogen bond interactions represented by dashed green line, backbone amide and carbonyl groups represented by blue and red spheres, respectively). Proline 246 of the GYP motif (G-P for Bd1817, this structure) sits at the edge of the second of two perpendicular U-shaped turns (with glycine 245, N atom shown as a blue sphere, preceding it). The GYP motif is located in a region close to that of the binuclear metal active site (liganding residues are yellow). (b) Possible binding site modeled for a c-di-GMP substrate in HD-GYP proteins. The bound phosphate in the Bd1817 structure was used as a guide to place c-di-GMP (stick form, C atoms magenta), with the 3 end located proximal to H187 (postulated to protonate this group upon bond cleavage; see text). One of the guanine bases is positioned toward the GYP motif and a region formed by the S262 and H293 residues (consensus A and D, respectively), while the other base clashes with the lid region (green). Regardless of how c-di-GMP is positioned next to the binuclear center, the restricted space available in this region suggests that a small conformational rearrangement of the lid region would be required to accommodate the substrate if this structure of Bd1817 is representative of other HD-GYP active-site geometry. (c) Detail of several nonconsensus residues of Bd1817 (single-letter code, C atoms blue, HD-GYP family consensus in parentheses; derived from Fig. 1), illustrating the position around the predicted c-di-GMP-binding site (in surface representation, transparent to show side chain detail, metal sites and bound phosphate ion). In particular, the consensus arginine at Bd1817 E274 would be well placed to contact the second c-di-GMP phosphate group (oriented toward the top in this view). The nonconsensus GYP motif at aa 245 and 246 has been left unnumbered for clarity.</div>
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