Electrostatic regulation of the cis- and trans-membrane interactions of synaptotagmin-1
<p dir="ltr">Synaptotagmin-1 is a vesicular protein and Ca<sup>2+</sup> sensor for Ca<sup>2+</sup>-dependent exocytosis. Ca<sup>2+</sup> induces synaptotagmin-1 binding to its own vesicle membrane, called the cis-interaction, thus preventing the tr...
محفوظ في:
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| منشور في: |
2022
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| الملخص: | <p dir="ltr">Synaptotagmin-1 is a vesicular protein and Ca<sup>2+</sup> sensor for Ca<sup>2+</sup>-dependent exocytosis. Ca<sup>2+</sup> induces synaptotagmin-1 binding to its own vesicle membrane, called the cis-interaction, thus preventing the trans-interaction of synaptotagmin-1 to the plasma membrane. However, the electrostatic regulation of the cis- and trans-membrane interaction of synaptotagmin-1 was poorly understood in different Ca<sup>2+</sup>-buffering conditions. Here we provide an assay to monitor the cis- and trans-membrane interactions of synaptotagmin-1 by using native purified vesicles and the plasma membrane-mimicking liposomes (PM-liposomes). Both ATP and EGTA similarly reverse the cis-membrane interaction of synaptotagmin-1 in free [Ca<sup>2+</sup>] of 10–100 μM. High PIP2 concentrations in the PM-liposomes reduce the Hill coefficient of vesicle fusion and synaptotagmin-1 membrane binding; this observation suggests that local PIP2 concentrations control the Ca<sup>2+</sup>-cooperativity of synaptotagmin-1. Our data provide evidence that Ca<sup>2+</sup> chelators, including EGTA and polyphosphate anions such as ATP, ADP, and AMP, electrostatically reverse the cis-interaction of synaptotagmin-1.</p><h2>Other Information</h2><p dir="ltr">Published in: Scientific Reports<br>License: <a href="https://creativecommons.org/licenses/by/4.0" target="_blank">https://creativecommons.org/licenses/by/4.0</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1038/s41598-022-26723-9" target="_blank">https://dx.doi.org/10.1038/s41598-022-26723-9</a></p> |
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