2q3x

The RIM1alpha C2B domain

spinqualitylabelsall models 2q3x, resolution 1.73Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2q3x is a 2 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: CL, NA, SO4 NonStd Res: MSE Gene: Rims1, Rim1 (Buffalo rat) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [RIMS1_RAT] Rab effector involved in exocytosis. May act as scaffold protein that regulates neurotransmitter release at the active zone. Essential for maintaining normal probability of neurotransmitter release and for regulating release during short-term synaptic plasticity (By similarity). 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 RIM proteins play critical roles in synaptic vesicle priming and diverse forms of presynaptic plasticity. The C-terminal C2B domain is the only module that is common to all RIMs but is only distantly related to well-studied C2 domains, and its three-dimensional structure and interactions have not been characterized in detail. Using NMR spectroscopy, we now show that N- and C-terminal extensions beyond the predicted C2B domain core sequence are necessary to form a folded, stable RIM1alpha C2B domain. We also find that the isolated RIM1alpha C2B domain is not sufficient for previously described protein-protein interactions involving the RIM1alpha C-terminus, suggesting that additional sequences adjacent to the C2B domain might be required for these interactions. However, analytical ultracentrifugation shows that the RIM1alpha C2B domain forms weak dimers in solution. The crystal structure of the RIM1alpha C2B domain dimer at 1.7 A resolution reveals that it forms a beta-sandwich characteristic of C2 domains and that the unique N- and C-terminal extensions form a small subdomain that packs against the beta-sandwich and mediates dimerization. Our results provide a structural basis to understand the function of RIM C2B domains and suggest that dimerization may be a crucial aspect of RIM function. Crystal structure of the RIM1alpha C2B domain at 1.7 A resolution.,Guan R, Dai H, Tomchick DR, Dulubova I, Machius M, Sudhof TC, Rizo J Biochemistry. 2007 Aug 7;46(31):8988-98. Epub 2007 Jul 14. PMID:17630786 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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