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<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="qQRPWmgUXls5yHPKeXD36peOBLFow1KQHDBUzcJgxWfzs8VARgg5AxKs9PnApCia">
<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="qQRPWmgUXls5yHPKeXD36peOBLFow1KQHDBUzcJgxWfzs8VARgg5AxKs9PnApCia">
<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="qQRPWmgUXls5yHPKeXD36peOBLFow1KQHDBUzcJgxWfzs8VARgg5AxKs9PnApCia">
<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="qQRPWmgUXls5yHPKeXD36peOBLFow1KQHDBUzcJgxWfzs8VARgg5AxKs9PnApCia">
<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="qQRPWmgUXls5yHPKeXD36peOBLFow1KQHDBUzcJgxWfzs8VARgg5AxKs9PnApCia">
<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="22661709">
<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://linkinghub.elsevier.com/retrieve/pii/S0021-9258(20)73676-8"
target="_blank"
rel="noopener"
ref="linksrc=fulltextorjournal_fulltext&amp;is_pmc=False&amp;PrId=3048&amp;itool=Abstract-def&amp;log$=linkouticon&amp;uid=22661709&amp;db=pubmed&amp;nlmid=2985121R"
title="See full text options at Elsevier Science"
data-ga-category="full_text"
data-ga-action="Elsevier Science"
data-ga-label="22661709"
><img src="https://cdn.ncbi.nlm.nih.gov/corehtml/query/egifs/https:--linkinghub.elsevier.com-ihub-images-elsevieroa.png" alt="Elsevier Science full text link"><span class="text">
Elsevier Science
</span></a><a class="link-item
pmc
"
href="https://pmc.ncbi.nlm.nih.gov/articles/pmid/22661709/"
target="_blank"
rel="noopener"
ref="linksrc=fulltextorjournal_fulltext&amp;is_pmc=True&amp;PrId=3494&amp;itool=Abstract-def&amp;log$=linkouticon&amp;uid=22661709&amp;db=pubmed&amp;nlmid=2985121R"
title="Free full text at PubMed Central"
data-ga-category="full_text"
data-ga-action="PMC"
data-ga-label="22661709"
><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="/22661709/citations/"
data-citation-style="nlm"
data-pubmed-format-link="/22661709/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="22661709" 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%2F22661709%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="qQRPWmgUXls5yHPKeXD36peOBLFow1KQHDBUzcJgxWfzs8VARgg5AxKs9PnApCia"><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"
data-ga-category="collections_button"
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-dialog-add-to-existing" class="action-panel-label">
Choose a collection:
</label><select id="collections-action-dialog-add-to-existing"
class="action-panel-selector collections-action-add-to-existing"
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Intra- and interprotein phosphorylation between two-hybrid histidine kinases controls Myxococcus xanthus developmental progression
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Histidine-aspartate phosphorelay signaling systems are used to couple stimuli to cellular responses. A hallmark feature is the highly modular signal transmission modules that can form both simple "two-component" systems and sophisticated multicomponent systems that integrate stimuli over time and space to generate coordinated and fine-tuned responses. The deltaproteobacterium Myxococcus xanthus contains a large repertoire of signaling proteins, many of which regulate its multicellular developmental program. Here, we assign an orphan hybrid histidine protein kinase, EspC, to the Esp signaling system that negatively regulates progression through the M. xanthus developmental program. The Esp signal system consists of the hybrid histidine protein kinase, EspA, two serine/threonine protein kinases, and a putative transport protein. We demonstrate that EspC is an essential component of this system because ΔespA, ΔespC, and ΔespA ΔespC double mutants share an identical developmental phenotype. Neither substitution of the phosphoaccepting histidine residue nor deletion of the entire catalytic ATPase domain in EspC produces an in vivo mutant developmental phenotype. In contrast, substitution of the receiver phosphoaccepting residue yields the null phenotype. Although the EspC histidine kinase can efficiently autophosphorylate in vitro, it does not act as a phosphodonor to its own receiver domain. Our in vitro and in vivo analyses suggest the phosphodonor is instead the EspA histidine kinase. We propose EspA and EspC participate in a novel hybrid histidine protein kinase signaling mechanism involving both inter- and intraprotein phosphotransfer. The output of this signaling system appears to be the combined phosphorylated state of the EspA and EspC receiver modules. This system regulates the proteolytic turnover of MrpC, an important regulator of the developmental program.
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<strong class="figure-label">
<p> FIGURE 1. </p>
</strong>
<div class="figure-caption-contents"><b> EspA and EspC are components… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 1. </p>
</strong>
<div class="figure-caption-contents"><b> EspA and EspC are components of a single signaling pathway. </b> <i> A </i> , developmental…</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">
FIGURE 1.
</strong>
<div class="figure-caption-contents"><b>EspA and EspC are components of a single signaling pathway.</b>
<i>A</i>, developmental phenotypes of <i>esp</i> null mutants. Wild type (<i>wt</i>; DZ2), Δ<i>espA</i> (DZ4227), Δ<i>espC</i> (PH1044), and Δ<i>espA</i> Δ<i>espC</i> (PH1047) strains were developed under submerged culture in 24-well culture dishes, and pictures were recorded at the indicated hours of development. Heat- and sonication-resistant spores were isolated at the indicated time points and displayed as the percent of wild type spores at 72 h. Spore numbers are the average and associated standard deviation of three biological replicates. <i>Scale bar</i>, 0.5 mm; <i>nd</i>, not determined. <i>B</i>, EspA and EspC developmental protein accumulation patterns. Anti-EspC (<i>left</i>) and anti-EspA (<i>right</i>) immunoblot analysis of cell lysates prepared from the indicated strains developed for the indicated hours under 16 ml of submerged culture format.</div>
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itemprop="contentUrl"
aria-describedby="figure-caption-1"
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data-image-width="693"
data-image-height="323"
data-image-alt="FIGURE 2."
data-pmc-id="PMC3408162"
data-figure-id="F2">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-1"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2b4e/3408162/37eb914235d1/zbc0321216880002.gif"
alt="FIGURE 2." />
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<strong class="figure-label">
<p> FIGURE 2. </p>
</strong>
<div class="figure-caption-contents"><b> Domain organization of the EspA… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 2. </p>
</strong>
<div class="figure-caption-contents"><b> Domain organization of the EspA and EspC hybrid histidine kinases. </b> Percent amino acid…</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">
FIGURE 2.
</strong>
<div class="figure-caption-contents"><b>Domain organization of the EspA and EspC hybrid histidine kinases.</b> Percent amino acid identity for the indicated domains is represented by <i>shaded areas</i>. The invariant histidine (<i>H</i>) residues in the dimerization and histidine phosphotransfer domains (<i>DHp</i>) and invariant aspartate (<i>D</i>) residues in the receiver (<i>REC</i>) domains are indicated. <i>FHA</i>, forkhead-associated domain; <i>MASE1</i>, predicted integral membrane sensory domain.</div>
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itemprop="contentUrl"
aria-describedby="figure-caption-2"
role="button"
data-image-width="693"
data-image-height="1432"
data-image-alt="FIGURE 3."
data-pmc-id="PMC3408162"
data-figure-id="F3">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-2"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2b4e/3408162/ed4bdb429017/zbc0321216880003.gif"
alt="FIGURE 3." />
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<strong class="figure-label">
<p> FIGURE 3. </p>
</strong>
<div class="figure-caption-contents"><b> Phosphorylation of EspC receiver domain,… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 3. </p>
</strong>
<div class="figure-caption-contents"><b> Phosphorylation of EspC receiver domain, but not EspC autophosphorylation, is required for regulation… </b></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">
FIGURE 3.
</strong>
<div class="figure-caption-contents"><b>Phosphorylation of EspC receiver domain, but not EspC autophosphorylation, is required for regulation of development.</b>
<i>A</i>, developmental phenotypes of <i>espA</i> and <i>espC</i> signal transmission point mutants. Wild type (<i>wt</i>; DZ2), Δ<i>espA</i> (DZ4227), <i>espA</i><sub>H407A</sub> (PH1008), <i>espA</i><sub>D696A</sub> (PH1009), <i>espA</i><sub>H407A,D696A</sub> (PH1029), Δ<i>espC</i> (PH1044), <i>espC</i><sub>H461A</sub> (PH1026), <i>espC</i><sub>D749A</sub> (PH1027),and <i>espC</i><sub>H461A,D749A</sub> (PH1028) strains were developed under submerged culture in 24-well culture dishes, and pictures were recorded at the indicated hours of development. Heat- and sonication-resistant spores were isolated at the indicated time points and displayed as the percent of wild type spores at 72 h. Spore numbers are the average and associated standard deviation of three biological replicates. <i>Scale bar</i>, 0.5 mm; <i>nd</i>, not determined. <i>B</i>, EspC and EspA developmental protein accumulation patterns. Anti-EspC (<i>left panel</i>) and anti-EspA (<i>right panel</i>) immunoblot analyses of cell lysates were prepared from the indicated strains developed for the indicated hours under 16 ml of submerged culture format.</div>
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itemprop="contentUrl"
aria-describedby="figure-caption-3"
role="button"
data-image-width="800"
data-image-height="1937"
data-image-alt="FIGURE 4."
data-pmc-id="PMC3408162"
data-figure-id="F4">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-3"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2b4e/3408162/b8375bd8619a/zbc0321216880004.gif"
alt="FIGURE 4." />
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<strong class="figure-label">
<p> FIGURE 4. </p>
</strong>
<div class="figure-caption-contents"><b> EspC kinase region autophosphorylates <i> in… </i> </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 4. </p>
</strong>
<div class="figure-caption-contents"><b> EspC kinase region autophosphorylates <i> in vitro </i> . </b> <i> A </i> , <i> in vitro </i> autophosphorylation of…</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">
FIGURE 4.
</strong>
<div class="figure-caption-contents"><b>EspC kinase region autophosphorylates <i>in vitro</i>.</b>
<i>A</i>, <i>in vitro</i> autophosphorylation of EspA<sub>HK</sub>-His<sub>6</sub>, EspC<sub>HK</sub>-His<sub>6</sub>, EspA<sub>HK H407A</sub>-His<sub>6</sub>, and EspC<sub>HK H461A</sub>-His<sub>6</sub>. 10 μ<sc>m</sc> of each recombinant protein was incubated in the presence of [γ-<sup>32</sup>P]ATP for 60 min, quenched, and resolved by SDS-PAGE, and the radiolabel was detected by exposure to a Storage PhosphoScreen (<i>AR</i>). Total protein was subsequently detected by Coomassie stain (<i>CS</i>). <i>B</i>, relative <i>in vitro</i> autophosphorylation rates of EspC and EspA kinase regions. 10 μ<sc>m</sc> EspA<sub>HK</sub>-His<sub>6</sub> or EspC<sub>HK</sub>-His<sub>6</sub> was incubated in the presence of [γ-<sup>32</sup>P]ATP; aliquots were removed at the indicated time points and analyzed as above. <i>C</i>, quantification of EspC (<i>dashed line</i>) and EspA (<i>solid line</i>) HK autophosphorylation rates in <i>B</i>. Relative (<i>rel.</i>) signal intensities of the bands from three independent time courses were quantified and normalized to the maximal signal intensity of each protein. The average relative signal intensity and associated standard deviation from each time point was plotted.</div>
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itemprop="contentUrl"
aria-describedby="figure-caption-4"
role="button"
data-image-width="760"
data-image-height="1090"
data-image-alt="FIGURE 5."
data-pmc-id="PMC3408162"
data-figure-id="F5">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-4"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2b4e/3408162/b63bf2ce9b96/zbc0321216880005.gif"
alt="FIGURE 5." />
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<strong class="figure-label">
<p> FIGURE 5. </p>
</strong>
<div class="figure-caption-contents"><b> EspA <sub> HK </sub> , but not… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 5. </p>
</strong>
<div class="figure-caption-contents"><b> EspA <sub> HK </sub> , but not EspC <sub> HK </sub> , efficiently phosphorylates EspC <sub> REC </sub> .… </b></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">
FIGURE 5.
</strong>
<div class="figure-caption-contents"><b>EspA<sub>HK</sub>, but not EspC<sub>HK</sub>, efficiently phosphorylates EspC<sub>REC</sub>.</b>
<i>A, in vitro</i> phosphotransfer from autophosphorylated EspC or EspA kinase regions to EspC receiver domain (<i>EspC<sub>REC</sub></i>). <i>Lanes 15</i>, EspC<sub>HK</sub>-His<sub>6</sub> (<i>K</i>) or EspC<sub>HK H461A</sub>-His<sub>6</sub> (<i>K</i><sup></sup>) was first incubated in the presence of [γ-<sup>32</sup>P]ATP for 30 min and then incubated with either buffer or equimolar (10 μ<sc>m</sc>) EspC<sub>REC</sub>-His<sub>6</sub> (<i>R</i>) or EspC<sub>REC D749A</sub>-His<sub>6</sub> (<i>R</i><sup></sup>) for 2 min as indicated. +, indicated component present; , indicated component absent. <i>Lanes 610</i>, EspA<sub>HK</sub>-His<sub>6</sub> (<i>K</i>) or EspA<sub>HK H407A</sub>-His<sub>6</sub> (<i>K</i><sup></sup>) analyzed as per <i>lanes 15</i>. All samples were quenched and resolved by SDS-PAGE, and radiolabel was detected by exposure to a Storage PhosphoScreen (<i>AR</i>). Total protein was subsequently detected by Coomassie stain (<i>CS</i>). <i>B</i>, quantification of the relative signal intensities of radiolabeled EspC or EspA HK (<i>K</i>, <i>black bars</i>), and EspC<sub>REC</sub> (<i>R</i>, <i>gray bars</i>). Signal intensities are the average and associated standard deviation of three biological replicates of the reactions represented in <i>A</i>. HK and REC intensity values are reported as a percent of the respective Esp HK autophosphorylation controls (represented by <i>lanes 1</i> and <i>6</i>, respectively). *, not determined.</div>
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itemprop="contentUrl"
aria-describedby="figure-caption-5"
role="button"
data-image-width="693"
data-image-height="1037"
data-image-alt="FIGURE 6."
data-pmc-id="PMC3408162"
data-figure-id="F6">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-5"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2b4e/3408162/8b5c0f7b4a2f/zbc0321216880006.gif"
alt="FIGURE 6." />
</a>
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<div class="caption-wrap">
<strong class="figure-label">
<p> FIGURE 6. </p>
</strong>
<div class="figure-caption-contents"><b> Disruption of a phosphatase motif… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 6. </p>
</strong>
<div class="figure-caption-contents"><b> Disruption of a phosphatase motif in EspA but not EspC effects developmental progression.… </b></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">
FIGURE 6.
</strong>
<div class="figure-caption-contents"><b>Disruption of a phosphatase motif in EspA but not EspC effects developmental progression.</b>
<i>A</i>, developmental phenotypes of <i>espC</i> and <i>espA</i> phosphatase motif mutants. Wild type (<i>wt</i>; DZ2), <i>espC</i><sub>D749A</sub> (PH1027), <i>espC</i><sub>N465Y</sub> (PH1034), <i>espC</i><sub>N465Y,D749A</sub> (PH1035), <i>espC</i><sub>ΔCA</sub> (PH1032), espC<sub>ΔCA,D749A</sub> (PH1033), and <i>espA</i><sub>N411D</sub> (PH1045) strains were developed under submerged culture in 24-well culture dishes, and pictures were recorded at the indicated hours of development. Heat- and sonication-resistant spores were isolated at the indicated time points and displayed as the percent of wild type spores at 72 h. Spore numbers are the average and associated standard deviation of three biological replicates. <i>Scale bar</i>, 0.5 mm; <i>nd</i>, not determined. <i>B</i>, EspC and EspA developmental protein accumulation patterns. Anti-EspC (<i>left panel</i>) and anti-EspA (<i>right panel</i>) immunoblot analyses of cell lysates were prepared from the indicated strains developed for the indicated hours under 16 ml of submerged culture format. *, 5 times longer exposure is required.</div>
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<img class="figure-thumb" itemprop="thumbnail"
id="article-image-6"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2b4e/3408162/1dd4d45c54cf/zbc0321216880007.gif"
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<strong class="figure-label">
<p> FIGURE 7. </p>
</strong>
<div class="figure-caption-contents"><b> Esp system negatively regulates MrpC… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 7. </p>
</strong>
<div class="figure-caption-contents"><b> Esp system negatively regulates MrpC protein stability. </b> <i> A </i> , MrpC developmental protein accumulation…</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">
FIGURE 7.
</strong>
<div class="figure-caption-contents"><b>Esp system negatively regulates MrpC protein stability.</b>
<i>A</i>, MrpC developmental protein accumulation patterns in the wild type (DZ2, <i>wt</i>), Δ<i>espC</i> (PH1044), Δ<i>espA</i> Δ<i>espC</i> (PH1047), <i>espC</i><sub>H461A</sub> (PH1026), <i>espC</i><sub>D749A</sub> (PH1027), and <i>espC</i><sub>H461A,D749A</sub> (PH1028) strains. 10 μg of total protein lysates developed for the indicated hours in the 16-ml submerged culture format were subject to anti-MrpC immunoblot. <i>B</i>, chloramphenicol chase of MrpC. Wild type (<i>wt</i>) or Δ<i>espA</i> Δ<i>espC</i> cells were developed for 9 h as above and treated with 34 μg ml<sup>1</sup> chloramphenicol for the indicated minutes. Equal proportions of the samples were subject to anti-MrpC immunoblot. <i>C</i>, calculation of the half-life (<i>t</i>½) of MrpC. Triplicate biological replicates of the wild type (<i>black line</i>) and Δ<i>espA</i> Δ<i>espC</i> (<i>gray line</i>) chloramphenicol chase experiments represented in <i>B</i> were performed, and the MrpC band intensity for each time point was normalized to <i>t</i> = 0 of the respective strain and averaged. The natural log of the average intensities was plotted <i>versus</i> min of chloramphenicol treatment and the slope a linear fit of the data were used to calculate the MrpC <i>t</i>½ in wild type cells as described under “Experimental Procedures.” No significant decrease in MrpC signal intensity could be detected in the Δ<i>espA</i> Δ<i>espC</i> strain. <i>Vertical bars</i>, standard deviation of the average from triplicate biological replicates; *, average intensity values are significantly different (<i>p</i> = 0.003).</div>
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<img class="figure-thumb" itemprop="thumbnail"
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<strong class="figure-label">
<p> FIGURE 8. </p>
</strong>
<div class="figure-caption-contents"><b> Model of the Esp signaling… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 8. </p>
</strong>
<div class="figure-caption-contents"><b> Model of the Esp signaling system. </b> Two-hybrid histidine kinases EspC ( <i> dark gray… </i></div>
</div>
<figcaption id="figure-caption-7" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
FIGURE 8.
</strong>
<div class="figure-caption-contents"><b>Model of the Esp signaling system.</b> Two-hybrid histidine kinases EspC (<i>dark gray</i>) and EspA (<i>light gray</i>) regulate the accumulation rate of an important developmental regulator, MrpC, to ensure appropriate and coordinated progression through the <i>M. xanthus</i> developmental program. The combined phosphorylation of EspA and EspC receiver domains (<i>REC</i>) activates an unknown protease or protease targeting factor (×) to stimulate MrpC turnover. EspA histidine kinase region (<i>HK</i>) autophosphorylates and donates a phosphoryl group to both its own and EspC receiver domains. EspA may also act as a phosphatase on EspA and or EspC REC. Autophosphorylation of EspC histidine kinase domain is not required for stimulating MrpC turnover under laboratory developmental conditions. EspA activity is controlled by a signaling module consisting of two serine/threonine kinases, PktA5 (<i>A5</i>) and PktB8 (<i>B8</i>), and a putative transport protein (EspB) predicted to reside in the cytoplasmic membrane (<i>CM</i>) (37, 41). PktA5 and PktB8 are thought to interact with the Forkhead associated (<i>FHA</i>) domain in EspA (41). Two PAS domains in EspA and one in EspC may be involved in sensing internal or membrane-associated redox stimuli (65). EspC is predicted to be anchored in the CM by putative MASE1 sensing domain of unknown function (64). The array of signaling domains may allow cell fate-specific accumulation of MrpC within the developmental program.</div>
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Related information
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<ul class="related-links-list"><li><a title="Related PubChem Compound" href="https://www.ncbi.nlm.nih.gov/pccompound?linkname=pubmed_pccompound&amp;from_uid=22661709"
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