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<meta name="description" content="Bacteria use second messengers for signal transduction. Cyclic di-AMP (c-di-AMP) is the only second messenger known so far that is essential for a large group of bacteria. We have studied the regulation of c-di-AMP synthesis and the role of the phosphodiesterases that degrade this second messenger. …"><meta name="keywords" content="pmid:26240071, PMC4573722, doi:10.1128/JB.00564-15, Research Support, Non-U.S. Gov&#x27;t, Jan Gundlach, Felix M P Mehne, Jörg Stülke, Bacillus subtilis / metabolism*, Bacterial Proteins / genetics, Bacterial Proteins / metabolism*, Dinucleoside Phosphates / metabolism*, Gene Expression Regulation, Bacterial / physiology*, Gene Expression Regulation, Enzymologic / physiology, Mutation, Phosphoric Diester Hydrolases / genetics, Phosphoric Diester Hydrolases / metabolism*, Phosphorus-Oxygen Lyases / genetics, Phosphorus-Oxygen Lyases / metabolism, Signal Transduction / physiology, PubMed Abstract, NIH, NLM, NCBI, National Institutes of Health, National Center for Biotechnology Information, National Library of Medicine, MEDLINE"><meta name="robots" content="index,nofollow,noarchive"><meta property="og:title" content="An Essential Poison: Synthesis and Degradation of Cyclic Di-AMP in Bacillus subtilis - PubMed"><meta property="og:url" content="https://pubmed.ncbi.nlm.nih.gov/26240071/"><meta property="og:description" content="Bacteria use second messengers for signal transduction. Cyclic di-AMP (c-di-AMP) is the only second messenger known so far that is essential for a large group of bacteria. We have studied the regulation of c-di-AMP synthesis and the role of the phosphodiesterases that degrade this second messenger. …"><meta property="og:image" content="https://cdn.ncbi.nlm.nih.gov/pubmed/persistent/pubmed-meta-image-v2.jpg"><meta property="og:image:secure_url" content="https://cdn.ncbi.nlm.nih.gov/pubmed/persistent/pubmed-meta-image-v2.jpg"><meta property="og:type" content="website"><meta property="og:site_name" content="PubMed"><meta name="twitter:domain" content="pubmed.ncbi.nlm.nih.gov"><meta name="twitter:card" content="summary_large_image"><meta name="twitter:title" content="An Essential Poison: Synthesis and Degradation of Cyclic Di-AMP in Bacillus subtilis - PubMed"><meta name="twitter:url" content="https://pubmed.ncbi.nlm.nih.gov/26240071/"><meta name="twitter:description" content="Bacteria use second messengers for signal transduction. Cyclic di-AMP (c-di-AMP) is the only second messenger known so far that is essential for a large group of bacteria. We have studied the regulation of c-di-AMP synthesis and the role of the phosphodiesterases that degrade this second messenger. …"><meta name="twitter:image" content="https://cdn.ncbi.nlm.nih.gov/pubmed/persistent/pubmed-meta-image-v2.jpg">
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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="3eGEt4Srw7DvyEGSOzEwphHkgeQAHLIxSMGR7uoJb9ihTIkYFW4tBfcwNIVWOZeF">
<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="3eGEt4Srw7DvyEGSOzEwphHkgeQAHLIxSMGR7uoJb9ihTIkYFW4tBfcwNIVWOZeF">
<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="3eGEt4Srw7DvyEGSOzEwphHkgeQAHLIxSMGR7uoJb9ihTIkYFW4tBfcwNIVWOZeF">
<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="3eGEt4Srw7DvyEGSOzEwphHkgeQAHLIxSMGR7uoJb9ihTIkYFW4tBfcwNIVWOZeF">
<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="3eGEt4Srw7DvyEGSOzEwphHkgeQAHLIxSMGR7uoJb9ihTIkYFW4tBfcwNIVWOZeF">
<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="26240071">
<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/JB.00564-15?url_ver=Z39.88-2003&amp;rfr_id=ori:rid:crossref.org&amp;rfr_dat=cr_pub 0pubmed"
target="_blank"
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ref="linksrc=fulltextorjournal_fulltext&amp;is_pmc=False&amp;PrId=4487&amp;itool=Abstract-def&amp;log$=linkouticon&amp;uid=26240071&amp;db=pubmed&amp;nlmid=2985120R"
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Atypon
</span></a><a class="link-item
pmc
"
href="https://pmc.ncbi.nlm.nih.gov/articles/pmid/26240071/"
target="_blank"
rel="noopener"
ref="linksrc=fulltextorjournal_fulltext&amp;is_pmc=True&amp;PrId=3494&amp;itool=Abstract-def&amp;log$=linkouticon&amp;uid=26240071&amp;db=pubmed&amp;nlmid=2985120R"
title="Free full text at PubMed Central"
data-ga-category="full_text"
data-ga-action="PMC"
data-ga-label="26240071"
><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="/26240071/citations/"
data-citation-style="nlm"
data-pubmed-format-link="/26240071/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="26240071" 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%2F26240071%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="3eGEt4Srw7DvyEGSOzEwphHkgeQAHLIxSMGR7uoJb9ihTIkYFW4tBfcwNIVWOZeF"><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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><sup class="key">1</sup> Department of General Microbiology, Institute of Microbiology and Genetics, Georg-August University Göttingen, Göttingen, Germany.</li>
<li data-affiliation-id="short-view-affiliation-2"
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><sup class="key">2</sup> Department of Molecular Microbiology and Genetics, Institute of Microbiology and Genetics, Georg-August University Göttingen, Göttingen, Germany.</li>
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><sup class="key">3</sup> Research Core Unit Metabolomics, Hanover Medical School, Hanover, Germany.</li>
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><sup class="key">4</sup> Department of General Microbiology, Institute of Microbiology and Genetics, Georg-August University Göttingen, Göttingen, Germany jstuelk@gwdg.de.</li>
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<p>
Gram-positive bacteria synthesize the second messenger cyclic di-AMP (c-di-AMP) to control cell wall and potassium homeostasis and to secure the integrity of their DNA. In the firmicutes, c-di-AMP is essential for growth. The model organism Bacillus subtilis encodes three diadenylate cyclases and two potential phosphodiesterases to produce and degrade c-di-AMP, respectively. Among the three cyclases, CdaA is conserved in nearly all firmicutes, and this enzyme seems to be responsible for the c-di-AMP that is required for cell wall homeostasis. Here, we demonstrate that CdaA localizes to the membrane and forms a complex with the regulatory protein CdaR and the glucosamine-6-phosphate mutase GlmM. Interestingly, cdaA, cdaR, and glmM form a gene cluster that is conserved throughout the firmicutes. This conserved arrangement and the observed interaction between the three proteins suggest a functional relationship. Our data suggest that GlmM and GlmS are involved in the control of c-di-AMP synthesis. These enzymes convert glutamine and fructose-6-phosphate to glutamate and glucosamine-1-phosphate. c-di-AMP synthesis is enhanced if the cells are grown in the presence of glutamate compared to that in glutamine-grown cells. Thus, the quality of the nitrogen source is an important signal for c-di-AMP production. In the analysis of c-di-AMP-degrading phosphodiesterases, we observed that both phosphodiesterases, GdpP and PgpH (previously known as YqfF), contribute to the degradation of the second messenger. Accumulation of c-di-AMP in a gdpP pgpH double mutant is toxic for the cells, and the cells respond to this accumulation by inactivation of the diadenylate cyclase CdaA.
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Importance:
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Bacteria use second messengers for signal transduction. Cyclic di-AMP (c-di-AMP) is the only second messenger known so far that is essential for a large group of bacteria. We have studied the regulation of c-di-AMP synthesis and the role of the phosphodiesterases that degrade this second messenger. c-di-AMP synthesis strongly depends on the nitrogen source: glutamate-grown cells produce more c-di-AMP than glutamine-grown cells. The accumulation of c-di-AMP in a strain lacking both phosphodiesterases is toxic and results in inactivation of the diadenylate cyclase CdaA. Our results suggest that CdaA is the critical diadenylate cyclase that produces the c-di-AMP that is both essential and toxic upon accumulation.
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<img class="figure-thumb" itemprop="thumbnail"
id="article-image-0"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3668/4573722/217470e3169a/zjb9990937740001.gif"
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<strong class="figure-label">
<p> FIG 1 </p>
</strong>
<div class="figure-caption-contents"><p> Major components of c-di-AMP signaling… </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> Major components of c-di-AMP signaling in B. subtilis studied in this work. (A)… </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">Major components of c-di-AMP signaling in B. subtilis studied in this work. (A) Cyclic di-AMP signaling in B. subtilis. Transmembrane regions are depicted as barrels, with one barrel per transmembrane domain. The three diadenylate cyclases, DisA, CdaA, and CdaS, are shown in yellow. CdaR and GlmM are shown in green and red, respectively. The phosphodiesterases GdpP and PgpH are shown in black. Please note that the illustration is not shown to scale. (B) Genetic organization of the highly conserved <i>cda-glm</i> operon in firmicutes. The operon is expressed under the control of a constitutive promoter; in addition, <i>glmS</i> is controlled by the glucosamine 6-phosphate-responsive <i>glmS</i> ribozyme.</div>
</figcaption>
</figure>
<figure class="figure-item "
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="1"
data-label-slug="fig-2">
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itemprop="contentUrl"
aria-describedby="figure-caption-1"
role="button"
data-image-width="680"
data-image-height="494"
data-image-alt="FIG 2"
data-pmc-id="PMC4573722"
data-figure-id="F2">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-1"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3668/4573722/43beb03c71cc/zjb9990937740002.gif"
alt="FIG 2" />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="680">
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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 2 </p>
</strong>
<div class="figure-caption-contents"><p> The diadenylate cyclase CdaA is… </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> The diadenylate cyclase CdaA is a membrane-associated enzyme. A crude extract of B.… </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">The diadenylate cyclase CdaA is a membrane-associated enzyme. A crude extract of B. subtilis GP1381 (<i>cdaA</i>-FLAG) was separated by ultracentrifugation to obtain cytosolic and membrane fractions. To check for successful separation, the cytosolic and membrane fractions were tested with specific antibodies recognizing CggR and Rny, respectively. CdaA-FLAG was detected using commercial antibodies. CE, cell extract.</div>
</figcaption>
</figure>
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itemprop="associatedMedia"
data-slide-index="2"
data-label-slug="fig-3">
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itemprop="contentUrl"
aria-describedby="figure-caption-2"
role="button"
data-image-width="740"
data-image-height="476"
data-image-alt="FIG 3"
data-pmc-id="PMC4573722"
data-figure-id="F3">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-2"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3668/4573722/4776ffcd1026/zjb9990937740003.gif"
alt="FIG 3" />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="740">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="476">
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<div class="caption-wrap">
<strong class="figure-label">
<p> FIG 3 </p>
</strong>
<div class="figure-caption-contents"><p> Interactions between CdaA, CdaR, and… </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> Interactions between CdaA, CdaR, and GlmM. (A) Detection of <i> in vivo </i> interaction partners… </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">Interactions between CdaA, CdaR, and GlmM. (A) Detection of <i>in vivo</i> interaction partners of CdaR. B. subtilis cells (GP1331) were grown in CSE minimal medium supplemented with glucose in the presence or absence of the cross-linker paraformaldehyde (PFA). The copurified proteins were analyzed in an SDS-polyacrylamide gel and visualized by silver staining. Proteins were identified by mass spectrometry. CE, cell extract; E , elution fraction without cross-linking; E +, elution fraction after cross-linking with paraformaldehyde. (B) B2H screen. (C) β-Galactosidase activities in B2H screen.</div>
</figcaption>
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itemprop="associatedMedia"
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data-label-slug="fig-4">
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itemprop="contentUrl"
aria-describedby="figure-caption-3"
role="button"
data-image-width="680"
data-image-height="351"
data-image-alt="FIG 4"
data-pmc-id="PMC4573722"
data-figure-id="F4">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-3"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3668/4573722/d041628252bd/zjb9990937740004.gif"
alt="FIG 4" />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="680">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="351">
<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> The intracellular c-di-AMP concentration depends… </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> The intracellular c-di-AMP concentration depends on the nitrogen source. Cells were grown in… </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">The intracellular c-di-AMP concentration depends on the nitrogen source. Cells were grown in SM minimal medium supplemented with the indicated nitrogen sources (68 mM [each]). Data for three biological replicates are shown; error bars show standard deviations. E, glutamate; Q glutamine.</div>
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itemprop="contentUrl"
aria-describedby="figure-caption-4"
role="button"
data-image-width="700"
data-image-height="264"
data-image-alt="FIG 5"
data-pmc-id="PMC4573722"
data-figure-id="F5">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-4"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3668/4573722/881a49b6eccb/zjb9990937740005.gif"
alt="FIG 5" />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="700">
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<strong class="figure-label">
<p> FIG 5 </p>
</strong>
<div class="figure-caption-contents"><p> Identification of PgpH as 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> Identification of PgpH as the major c-di-AMP-hydrolyzing enzyme. Cells were grown in SM… </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">Identification of PgpH as the major c-di-AMP-hydrolyzing enzyme. Cells were grown in SM minimal medium supplemented with glutamine (gray) or glutamate (black). Data for three biological replicates are shown; error bars show standard deviations. wt, wild type.</div>
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itemprop="contentUrl"
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data-image-width="650"
data-image-height="92"
data-image-alt="FIG 6"
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data-figure-id="F6">
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<p> FIG 6 </p>
</strong>
<div class="figure-caption-contents"><p> Mutations affecting the diadenylate cyclase… </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> Mutations affecting the diadenylate cyclase CdaA. TM, transmembrane region; CC, coiled-coil domain; DAC,… </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">Mutations affecting the diadenylate cyclase CdaA. TM, transmembrane region; CC, coiled-coil domain; DAC, diadenylate cyclase domain; #, DGA and RHR active site motifs; SD, Shine-Dalgarno sequence (the first G of the sequence is replaced by a T in the suppressor mutant GP2134); *, frameshift mutations (both mutations result in the production of inactive truncated proteins); △, C-terminal deletion.</div>
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