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Ca2+-bridging mechanism and phospholipid head group recognition in the membrane-binding protein annexin V

Abstract

Structural evidence is presented for a ‘Ca2+-bridging’ mechanism, proposed for Ca2+- binding interfacial membrane proteins such as annexins, protein kinase C, and certain coagulation proteins. Crystal structures of Ca2+-annexin V complexes with phospholipid polar heads provide molecular details of ‘Ca2+-bridges’ as key features in the membrane attachment exhibited by these proteins. Distinct binding sites for phospholipid head groups are observed, including a novel, double-Ca2+ recognition site for phosphoserine that may serve as a phosphatidylserine receptor site in vivo.

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Swairjo, M., Concha, N., Kaetzel, M. et al. Ca2+-bridging mechanism and phospholipid head group recognition in the membrane-binding protein annexin V. Nat Struct Mol Biol 2, 968–974 (1995). https://doi.org/10.1038/nsb1195-968

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