2bwq | pdb_00002bwq

CRYSTAL STRUCTURE OF THE RIM2 C2A-DOMAIN AT 1.4 ANGSTROM RESOLUTION

spinqualitylabelsall models 2bwq, resolution 1.41Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2bwq is a 1 chain structure with sequence from Buffalo rat. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Function [RIMS2_RAT] Rab effector involved in exocytosis. May act as scaffold protein. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed RIMs are large proteins that contain two C2-domains and are localized at presynaptic active zones, where neurotransmitters are released. RIMs play key roles in synaptic vesicle priming and regulation of presynaptic plasticity. A mutation in the RIM1 C2A-domain has been implicated in autosomal dominant cone-rod dystrophy (CORD7). The RIM C2A-domain does not contain the full complement of aspartate residues that commonly mediate Ca2+ binding at the top loops of C2-domains, and has been reported to interact with SNAP-25 and synaptotagmin 1, two proteins from the Ca2+-dependent membrane fusion machinery. Here we have used NMR spectroscopy and X-ray crystallography to analyze the structure and biochemical properties of the RIM2 C2A-domain, which is closely related to the RIM1 C2A-domain. We find that the RIM2 C2A-domain does not bind Ca2+. Moreover, little binding of the RIM2 C2A-domain to SNAP-25 and to the C2-domains of synaptotagmin 1 was detected by NMR experiments, suggesting that as yet unidentified interactions of the RIM C2A-domain mediate its function. The crystal structure of the RIM2 C2A-domain using data to 1.4 A resolution reveals a beta-sandwich that resembles those observed for other C2-domains, but exhibits a unique dipolar distribution of electrostatic charges whereby one edge of the beta-sandwich is highly positive and the other edge is highly negative. The location of the mutation site implicated in CORD7 at the bottom of the domain and the pattern of sequence conservation suggest that, in contrast to most C2-domains, the RIM C2A-domains may function through Ca2+-independent interactions involving their bottom face. Crystal structure of the RIM2 C2A-domain at 1.4 A resolution.,Dai H, Tomchick DR, Garcia J, Sudhof TC, Machius M, Rizo J Biochemistry. 2005 Oct 18;44(41):13533-42. PMID:16216076 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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