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Structural characterization of the Rabphilin-3A-SNAP25 interaction
- Source :
- Digital.CSIC. Repositorio Institucional del CSIC, instname
- Publication Year :
- 2017
-
Abstract
- Membrane 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/Ca2+ 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 Ca2+-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.<br />Work in Barcelona was supported by Grants BIO2014-54588-P [Ministry of Economy and Competitiveness (MINECO), Spain–European Fund for Economic and Regional Development (FEDER)] and Maria de Maeztu Unit of Excellence MDM-2014-0435. Work in Murcia was supported by Grants BFU2014-52269-P (MINECO, Spain–FEDER) and Fundación Séneca Region de Murcia 19409/PI/14. X-ray data were collected at ALBA-CELLS (beamline XALOC) (Cerdanyola del Valles, Barcelona, Spain) with the collaboration of ALBA staff and at ESRF beamline ID23.2 (Grenoble, France). Financial support was also provided by ALBA and ESRF.
- Subjects :
- 0301 basic medicine
Vesicle fusion
Synaptosomal-Associated Protein 25
Vesicle-Associated Membrane Protein 2
membrane fusion
Vesicular Transport Proteins
Syntaxin 1
Nerve Tissue Proteins
Biology
Rabphilin-3A
Crystallography, X-Ray
Ligands
Exocytosis
Membrane bending
03 medical and health sciences
0302 clinical medicine
Protein Domains
Animals
C2 domains
X-ray crystallography
Adaptor Proteins, Signal Transducing
Multidisciplinary
Secretory Vesicles
Cell Membrane
SNAP25
Lipid bilayer fusion
Munc-18
Secretory Vesicle
Cell biology
Rats
030104 developmental biology
PNAS Plus
Mutation
SNAP-25
Calcium
030217 neurology & neurosurgery
Protein Binding
Subjects
Details
- ISSN :
- 10916490
- Volume :
- 114
- Issue :
- 27
- Database :
- OpenAIRE
- Journal :
- Proceedings of the National Academy of Sciences of the United States of America
- Accession number :
- edsair.doi.dedup.....cf89f62a5b4824d2c307ce583c5330f4