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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="wGL8gmayDYLss3pJkOHijljDnhPnw5wENtvdTcDUdzyWmuvzX7kkNtPhVlxzpG4Y">
<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="wGL8gmayDYLss3pJkOHijljDnhPnw5wENtvdTcDUdzyWmuvzX7kkNtPhVlxzpG4Y">
<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="wGL8gmayDYLss3pJkOHijljDnhPnw5wENtvdTcDUdzyWmuvzX7kkNtPhVlxzpG4Y">
<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="wGL8gmayDYLss3pJkOHijljDnhPnw5wENtvdTcDUdzyWmuvzX7kkNtPhVlxzpG4Y">
<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="wGL8gmayDYLss3pJkOHijljDnhPnw5wENtvdTcDUdzyWmuvzX7kkNtPhVlxzpG4Y">
<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="15747061">
<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://doi.org/10.1007/s00018-004-4462-3"
target="_blank"
rel="noopener"
ref="linksrc=fulltextorjournal_fulltext&amp;is_pmc=False&amp;PrId=3055&amp;itool=Abstract-def&amp;log$=linkouticon&amp;uid=15747061&amp;db=pubmed&amp;nlmid=9705402"
title="See full text options at Springer"
data-ga-category="full_text"
data-ga-action="Springer"
data-ga-label="15747061"
><img src="https://cdn.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--production.springer.de-OnlineResources-Logos-springerlink.gif" alt="Springer full text link"><span class="text">
Springer
</span></a><a class="link-item
pmc
"
href="https://pmc.ncbi.nlm.nih.gov/articles/pmid/15747061/"
target="_blank"
rel="noopener"
ref="linksrc=fulltextorjournal_fulltext&amp;is_pmc=True&amp;PrId=3494&amp;itool=Abstract-def&amp;log$=linkouticon&amp;uid=15747061&amp;db=pubmed&amp;nlmid=9705402"
title="Free full text at PubMed Central"
data-ga-category="full_text"
data-ga-action="PMC"
data-ga-label="15747061"
><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="/15747061/citations/"
data-citation-style="nlm"
data-pubmed-format-link="/15747061/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="15747061" 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%2F15747061%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="wGL8gmayDYLss3pJkOHijljDnhPnw5wENtvdTcDUdzyWmuvzX7kkNtPhVlxzpG4Y"><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"
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Heterotrimeric G-proteins are intracellular partners of G-protein-coupled receptors (GPCRs). GPCRs act on inactive Galpha.GDP/Gbetagamma heterotrimers to promote GDP release and GTP binding, resulting in liberation of Galpha from Gbetagamma. Galpha.GTP and Gbetagamma target effectors including adenylyl cyclases, phospholipases and ion channels. Signaling is terminated by intrinsic GTPase activity of Galpha and heterotrimer reformation - a cycle accelerated by 'regulators of G-protein signaling' (RGS proteins). Recent studies have identified several unconventional G-protein signaling pathways that diverge from this standard model. Whereas phospholipase C (PLC) beta is activated by Galpha(q) and Gbetagamma, novel PLC isoforms are regulated by both heterotrimeric and Ras-superfamily G-proteins. An Arabidopsis protein has been discovered containing both GPCR and RGS domains within the same protein. Most surprisingly, a receptor-independent Galpha nucleotide cycle that regulates cell division has been delineated in both Caenorhabditis elegans and Drosophila melanogaster. Here, we revisit classical heterotrimeric G-protein signaling and explore these new, non-canonical G-protein signaling pathways.
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Figures
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<p> Figure 1 </p>
</strong>
<div class="figure-caption-contents"><p> Standard model of the GDP/GTP… </p></div>
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<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"><p> Standard model of the GDP/GTP cycle governing activation of heterotrimeric GPCR signaling pathways.… </p></div>
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<strong class="figure-label">
Figure 1
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<div class="figure-caption-contents">Standard model of the GDP/GTP cycle governing activation of heterotrimeric GPCR signaling pathways. In the absence of ligand, the G<i>α</i> subunit is GDP bound and closely associated with the G<i>βγ</i> heterodimer. This G<i>α</i>·GDP/G<i>βγ</i> heterotrimer interacts with the cytosolic loops of a seven-transmembrane-domain G-protein-coupled receptor (GPCR). G<i>βγ</i> facilitates the coupling of G<i>α</i> to receptor and also acts as a guanine nucleotide dissociation inhibitor (GDI) for G<i>α</i>·GDP, slowing the spontaneous exchange of GDP for GTP. Ligand-bound GPCRs act as guanine nucleotide exchange factors (GEFs) by inducing a conformational change in the G<i>α</i> subunit, allowing it to exchange GTP for GDP. G<i>βγ</i> dissociates from G<i>α</i>·GTP, and both G<i>α</i>·GTP and G<i>βγ</i> are competent to signal to their respective effectors. The cycle returns to the basal state when G<i>α</i> hydrolyzes the gamma-phosphate moiety of GTP, a reaction that is augmented by GTPase-accelerating proteins (GAPs) such as the Regulator of G-protein Signaling (RGS) proteins.</div>
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src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9e23/11365923/177d37f58819/18_2004_4462_Fig2.gif"
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<p> Figure 2 </p>
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<div class="figure-caption-contents"><p> Structural features of heterotrimeric G-protein… </p></div>
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<strong class="figure-label">
<p> Figure 2 </p>
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<div class="figure-caption-contents"><p> Structural features of heterotrimeric G-protein subunits. ( <i> A </i> ) The crystal structure of… </p></div>
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Figure 2
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<div class="figure-caption-contents">Structural features of heterotrimeric G-protein subunits. (<i>A</i>) The crystal structure of G<i>α</i>
<sub>t</sub>·GDP·AlF<sub arrange="stack">4</sub><sup arrange="stack"></sup> (Protein Data Bank identifier: 1TAD) illustrates the Ras-like domain, the all-alpha-helical domain and the bound nucleotide at the interdomain interface. Switch regions I, II and III are shown in blue, GDP in magenta and the phosphate binding loop (P-loop) in yellow. Alpha-helices and beta-sheets are labeled according to traditional designations. (<i>B</i>) Close-up view of the guanine nucleotide binding pocket of a chimeric G<i>α</i>
<sub>t/i1</sub> subunit (structural coordinates from PBD ID: 1GOT). Residues that contact the guanine base, ribose sugar, and <i>α</i> and <i>β</i> phosphates are labeled. P-loop residues are shown in yellow and GDP in magenta. (<i>C</i>) The structure of the G<i>β</i>
<sub>1</sub>
<i>γ</i>
<sub>1</sub> dimer (PDB ID: 1TBG) shows that G<i>β</i> (yellow) forms a seven-bladed propeller consisting of seven WD40 repeats. G<i>γ</i> (red) forms two alpha helices that bind to the single alpha-helix of G<i>β</i> and to several of the WD40 blades. (<i>D</i>) The crystal structure of the heterotrimer (PDB ID: 1GOT) shows that the switch regions of G<i>α</i> (blue) form part of the interface for interaction with G<i>βγ</i>.</div>
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<strong class="figure-label">
<p> Figure 3 </p>
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<div class="figure-caption-contents"><p> Schematic of the varied multi-domain… </p></div>
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<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> Figure 3 </p>
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<div class="figure-caption-contents"><p> Schematic of the varied multi-domain architectures of RGS family proteins. RGS subfamily nomenclature… </p></div>
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Figure 3
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<div class="figure-caption-contents">Schematic of the varied multi-domain architectures of RGS family proteins. RGS subfamily nomenclature follows that first established by Wilkie and Ross [318]. Abbreviations used are Cys (cysteine-rich region), RGS (Regulator of G-protein Signaling domain), DEP (Dishevelled/EGL-10/Pleckstrin homology domain), GGL (G<i>γ</i>-like domain), PDZ (PSD-95/Dlg/ZO-1 homology domain), PTB (phosphotyrosine binding domain), RBD (Ras binding domain), GoLoco (G<i>α</i>
<sub>i/o</sub>-Loco interacting motif), <i>β</i>Cat (<i>β</i>-catenin binding domain), GSK3<i>β</i> (glycogen synthase kinase-3<i>β</i> binding domain), PP2A (phosphatase PP2A binding domain), DIX (domain present in Dishevelled and Axin), DH (Dbl homology domain), PH (Pleckstrin homology domain), Ser/Thr-kinase (serine-threonine kinase domain).</div>
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<p> Figure 4 </p>
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<div class="figure-caption-contents"><p> Domain architecture of mammalian PLC… </p></div>
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<strong class="figure-label">
<p> Figure 4 </p>
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<div class="figure-caption-contents"><p> Domain architecture of mammalian PLC family members. Hallmarks of phosholipase C (PLC) family… </p></div>
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Figure 4
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<div class="figure-caption-contents">Domain architecture of mammalian PLC family members. Hallmarks of phosholipase C (PLC) family members are an N-terminal PH domain, which binds G<i>βγ</i> subunits, and EF, X, Y and C2 motifs forming the catalytic core for phosphoinositide hydrolysis. PLC-<i>γ</i> can be activated by G<i>α</i>
<sub>q</sub> through a unique C-terminal (CT) domain [319], which also acts as a G<i>α</i>
<sub>q</sub> GAP [111]. Unique to PLC-<i>γ</i> are two Src-homology-2 (SH2) domains and a Src-homology-3 (SH3) domain that bisect the PH domain. The SH2 domains confer sensitivity to stimulation by PDGF and EGF receptors, whereas the SH3 domain has been shown to act as a GEF for the phosphatidylinositol-3 kinase (PI3K) enhancer, PIKE [320]. PLC-<i>ɛ</i> interacts with a variety of small GTPases through domains not found in other PLCs. An N-terminal CDC25 (cell division cycle protein 25-like) domain has been shown to promote guanine nucleotide exchange of Ras-family GTPases such as H-Ras and Rap1A, whereas the second Ras-associating (RA) domain (RA2) is reported to bind to H-Ras and Rap in a GTP-dependent fashion; the first RA domain (RA1) displays weak affinity for H-Ras and binds independent of nucleotide state. In addition, RhoA, RhoB and RhoC can activate PLC-<i>ɛ</i> through a unique 6070-amino acid insert (shaded box) in the Y domain [161]; other Rho family members such as Rac1, Rac2, Rac3 and Cdc42 do not interact with PLC-<i>ɛ</i>.</div>
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<strong class="figure-label">
<p> Figure 5 </p>
</strong>
<div class="figure-caption-contents"><p> The 19-amino acid GoLoco motif… </p></div>
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<strong class="figure-label">
<p> Figure 5 </p>
</strong>
<div class="figure-caption-contents"><p> The 19-amino acid GoLoco motif is found in a diverse set of signaling… </p></div>
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Figure 5
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<div class="figure-caption-contents">The 19-amino acid GoLoco motif is found in a diverse set of signaling regulatory proteins. Domain organization of single- and multi-GoLoco motif-containing proteins is illustrated. Abbreviations used are RGS (Regulator of G-protein Signaling domain), RBD (Ras binding domain), GoLoco or GL (G<i>α</i>
<sub>i/o</sub>-Loco interacting motif), PDZ (PSD-95/Dlg/ZO-1 homology domain), PTB (phosphotyrosine binding domain), RapGAP (Rap-specific GTPase-activating protein domain), GPSM (G-protein-signaling modulator).</div>
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<p> Figure 6 </p>
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<div class="figure-caption-contents"><p> Proposed models of AtRGS1 signaling… </p></div>
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<strong class="figure-label">
<p> Figure 6 </p>
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<div class="figure-caption-contents"><p> Proposed models of AtRGS1 signaling interactions. ( <i> A </i> ) In the Membrane anchor</p></div>
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Figure 6
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<div class="figure-caption-contents">Proposed models of AtRGS1 signaling interactions. (<i>A</i>) In the Membrane anchor scenario, AtRGS1 acts to recruit (grey arrow) activated AtGPA1 to specific membrane microdomains, allowing localized signaling and deactivation by AtRGS1. (<i>B</i>) In the Spatial focusing model, AtRGS1 is a ligand-activated GPCR that coordinately catalyzes both guanine nucleotide exchange on the <i>Arabidopsis</i> heterotrimer (grey arrow) and GTP hydrolysis by the activated G<i>α</i> subunit (dotted arrow). (<i>C</i>) In the third model, AtRGS1 is a ligand-regulated GAP: i.e. ligand-mediated agonism or inverse agonism regulates deactivation of AtGPA1·GTP via AtRGS1 RGS domain GAP activity.</div>
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<strong class="figure-label">
<p> Figure 7 </p>
</strong>
<div class="figure-caption-contents"><p> Models of asymmetric cell division… </p></div>
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<strong class="figure-label">
<p> Figure 7 </p>
</strong>
<div class="figure-caption-contents"><p> Models of asymmetric cell division in <i> Drosophila </i> and <i> C. elegans </i> . (A) In… </p></div>
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Figure 7
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<div class="figure-caption-contents">Models of asymmetric cell division in <i>Drosophila</i> and <i>C. elegans</i>. (A) In delaminating neuroblasts, two apical complexes (Bazooka [Baz], atypical protein kinase C [DaPKC] and Par6; Inscuteable [Insc], Partner of Inscuteable [Pins] and G<i>α</i>i) facilitate the localization of cell-fate determinants to the basal lateral membrane and the orientation of the mitotic spindle. (<i>B</i>) In sensory precursor (SOP) cells, planar polarity is established by counteracting complexes of Baz-DaPKC towards the posterior and Discs Large (Dlg)-Pins-G<i>α</i>i towards the anterior. (<i>C</i>) In <i>C. elegans</i> one-cell zygotes, PAR-1/-2 proteins enrich GPR-1/2-GOA-1 complex localization towards the posterior, resulting in greater astral microtubule pulling forces on the posterior spindle pole and a resultant smaller P1 daughter cell.</div>
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<strong class="figure-label">
<p> Figure 8 </p>
</strong>
<div class="figure-caption-contents"><p> Phenotypes and relative spindle pulling… </p></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"><p> Phenotypes and relative spindle pulling forces of <i> C. elegans </i> embryos in various genetic… </p></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">Phenotypes and relative spindle pulling forces of <i>C. elegans</i> embryos in various genetic backgrounds. In wild-type embryos, posterior enrichment of G<i>α</i> and GPR-1/2 are associated with stronger posterior pulling forces resulting in asymmetric division (light grey, AB daughter cell; dark grey, P1 daughter cell). Loss-of-function mutation or RNAi of either <i>goa-1</i> or <i>gpa-16</i> G<i>α</i> subunit leads to reduction in force magnitude and force asymmetry, but no change in the overall asymmetry of the cell division [294]. Mutation or RNAi of both G-protein subunits, both GoLoco motif proteins <i>gpr-1/2</i> or the receptor-independent G<i>α</i> GEF <i>ric-8</i> causes symmetric division due to loss or mislocalization of pulling force generators. Simultaneous loss of <i>ric-8</i> and <i>gpb-1</i> leads to an enhancement of anterior pulling forces indistinguishable from <i>gpb-1</i> RNAi alone [294]. In contrast, <i>rgs-7</i> mutants display reduced anterior pulling forces, resulting in exaggerated asymmetry and a smaller P1 cell [305]. In all cases, pulling forces were determined by laser ablation of central mitotic spindles and direct measurement of resultant peak velocities of spindle poles.</div>
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<p> Figure 9 </p>
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<div class="figure-caption-contents"><p> Working model of G <i> α… </i> </p></div>
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<p> Figure 9 </p>
</strong>
<div class="figure-caption-contents"><p> Working model of G <i> α </i> activation during asymmetric cell division of <i> C. elegans… </i> </p></div>
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<figcaption id="figure-caption-8" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
Figure 9
</strong>
<div class="figure-caption-contents">Working model of G<i>α</i> activation during asymmetric cell division of <i>C. elegans</i> embryos. (<i>A</i>) In the wild-type embryo, RIC-8 GEF activity generates G<i>α</i>·GTP. (It is still unclear whether <i>C. elegans</i> RIC-8 can act directly on G<i>βγ</i>-complexed G<i>α</i>·GDP, since rat Ric-8A has been shown, at least in vitro, to act only on free G<i>α</i> subunits [193]. An alternate possibility is that a distinct pool of free G<i>α</i> exists or is generated from G<i>α</i>·GDP/G<i>βγ</i> heterotrimers by some as-yet unidentified player in this pathway.) The intrinsic GTPase activity of G<i>α</i>·GTP, possibly accelerated by RGS-7 GAP activity, then generates G<i>α</i>·GDP that binds the GoLoco motif of GPR-1/2 (the latter protein in complex with its critical co-factor LIN-5; [199]). The GPR-1/2/G<i>α</i>·GDP complex is presumed to either modulate the (as-yet undefined) astral microtubule force generator or directly generate force (black arrow). (<i>B</i>) In the absence of RIC-8 activity, G<i>α</i>·GTP levels are reduced, resulting in significantly lower levels of G<i>α</i>·GDP required to form the GPR-1/2/G<i>α</i>·GDP complex. This is consistent with the observations of reduced GPR-1/2/G<i>α</i>·GDP co-immunoprecipitation from <i>ric-8 (md1909+RNAi) C. elegans</i> embryos [294]. (<i>C</i>) Combining the elimination of RIC-8 activity with RNAi-mediated knockdown of <i>gpb-1</i> (G<i>β</i>) is observed to restore the levels of GPR-1/2/G<i>α</i>·GDP complex [294] and the magnitude of force applied to the spindle poles (fig. 8). G<i>α</i>·GDP freed from its normal heterotrimeric state has a higher spontaneous nucleotide exchange rate [5] and therefore, in this model, can cycle through the GTP-bound state, GTP hydrolysis and GPR-1/2 interaction (or can directly bind to GPR-1/2; not shown). (<i>D</i>) In this model, loss of RGS-7 GAP activity leads to slower conversion of G<i>α</i>·GTP to the G<i>α</i>·GDP form required for the GPR-1/2/G<i>α</i>·GDP complex. This is consistent with the reduced anterior forces observed in loss-of-function <i>rgs-7</i> mutants, although it is not known if RGS-7 is restricted in expression to the anterior cortex [305].</div>
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