Calcium promotes the formation of syntaxin 1 mesoscale domains through phosphatidylinositol 4,5-bisphosphate
Publikation: Beitrag in Fachzeitschrift › Forschungsartikel › Beigetragen › Begutachtung
Beitragende
Abstract
Phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2) is a minor component of total plasma membrane lipids, but it has a substantial role in the regulation of many cellular functions, including exo- and endocytosis. Recently, it was shown that PI(4,5)P2 and syntaxin 1, a SNARE protein that catalyzes regulated exocytosis, form domains in the plasma membrane that constitute recognition sites for vesicle docking. Also, calcium was shown to promote syntaxin 1 clustering in the plasma membrane, but the molecular mechanism was unknown. Here, using a combination of superresolution stimulated emission depletion microscopy, FRET, and atomic force microscopy, we show that Ca2+ acts as a charge bridge that specifically and reversibly connects multiple syntaxin 1/PI(4,5)P2 complexes into larger mesoscale domains. This transient reorganization of the plasma membrane by physiological Ca2+ concentrations is likely to be important for Ca2+-regulated secretion.
Details
Originalsprache | Englisch |
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Seiten (von - bis) | 7868-7876 |
Seitenumfang | 9 |
Fachzeitschrift | Journal of Biological Chemistry |
Jahrgang | 291 |
Ausgabenummer | 15 |
Publikationsstatus | Veröffentlicht - 8 Apr. 2016 |
Peer-Review-Status | Ja |
Extern publiziert | Ja |
Externe IDs
PubMed | 26884341 |
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ORCID | /0000-0003-0475-3790/work/161889547 |