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From Proteopedia
Structure of the Ca2+-bound Rabphilin 3A C2B domain SNAP25 complex (P21 space group)
Structural highlights
Function[RP3A_RAT] Protein transport. Probably involved with Ras-related protein Rab-3A in synaptic vesicle traffic and/or synaptic vesicle fusion. Could play a role in neurotransmitter release by regulating membrane flow in the nerve terminal. [SNP25_RAT] t-SNARE involved in the molecular regulation of neurotransmitter release. May play an important role in the synaptic function of specific neuronal systems. Associates with proteins involved in vesicle docking and membrane fusion. Regulates plasma membrane recycling through its interaction with CENPF. Publication Abstract from PubMedMembrane fusion is essential in a myriad of eukaryotic cell biological processes, including the synaptic transmission. Rabphilin-3A is a membrane trafficking protein involved in the calcium-dependent regulation of secretory vesicle exocytosis in neurons and neuroendocrine cells, but the underlying mechanism remains poorly understood. Here, we report the crystal structures and biochemical analyses of Rabphilin-3A C2B-SNAP25 and C2B-phosphatidylinositol 4,5-bisphosphate (PIP2) complexes, revealing how Rabphilin-3A C2 domains operate in cooperation with PIP2/Ca(2+) and SNAP25 to bind the plasma membrane, adopting a conformation compatible to interact with the complete SNARE complex. Comparisons with the synaptotagmin1-SNARE show that both proteins contact the same SNAP25 surface, but Rabphilin-3A uses a unique structural element. Data obtained here suggest a model to explain the Ca(2+)-dependent fusion process by membrane bending with a myriad of variations depending on the properties of the C2 domain-bearing protein, shedding light to understand the fine-tuning control of the different vesicle fusion events. Structural characterization of the Rabphilin-3A-SNAP25 interaction.,Ferrer-Orta C, Perez-Sanchez MD, Coronado-Parra T, Silva C, Lopez-Martinez D, Baltanas-Copado J, Gomez-Fernandez JC, Corbalan-Garcia S, Verdaguer N Proc Natl Acad Sci U S A. 2017 Jul 3;114(27):E5343-E5351. doi:, 10.1073/pnas.1702542114. Epub 2017 Jun 20. PMID:28634303[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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