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- W2003200324 abstract "The chromaffin granule membrane binding and aggregating properties of three annexins, synexin, p32 and p67, have been studied and compared. Each protein was activated to bind and aggregate membranes with a biphasic Ca2+ dependence, with one phase titrating between pCa 5.0–3.5 and the second at higher levels of calcium (pCa < 3.5). cis-Unsaturated free fatty acids lowered these Ca2+ requirements by approximately one log unit. Barium and strontium were able to partially substitute for calcium, with the order of sensitivity Ca2+ >; Sr2+ >; Ba2+. The proteins appeared to bind to distinct but overlapping populations of receptor sites, and did so in a manner displaying positive cooperativity at the higher Ca2+ levels. The maximal efficacy of the proteins as membrane aggregators differed with synexin being 1–2-fold more efficacious than p32, which in turn was 7-fold more efficacious than p67. In combination, p67 was an effective inhibitor of granule aggregation induced by synexin or p32, while p32 was able to both promote and inhibit synexin-induced granule aggregation in a manner which varied with synexin concentration. The complexity of these annexin-membrane interactions may be a reflection of the multidomain structure of the annexins and may have implications for the differential functions of these proteins in cells." @default.
- W2003200324 created "2016-06-24" @default.
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- W2003200324 date "1990-11-01" @default.
- W2003200324 modified "2023-10-11" @default.
- W2003200324 title "Annexin-chromaffin granule membrane interactions: a comparative study of synexin, p32 and p67" @default.
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- W2003200324 doi "https://doi.org/10.1016/0005-2736(90)90448-w" @default.
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