3evu | pdb_00003evu

Crystal structure of Calcium bound dimeric GCAMP2, (#1)

spinqualitylabelsall models 3evu, resolution 1.75Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3evu is a 1 chain structure with sequence from Aequorea victoria. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA NonStd Res: CRO Related: 3evp, 3evr, 3evv Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Genetically encoded Ca(2+) indicators are important tools that enable the measurement of Ca(2+) dynamics in a physiologically relevant context. GCaMP2, one of the most robust indicators, is a circularly permutated EGFP (cpEGFP)/M13/calmodulin (CaM) fusion protein that has been successfully used for studying Ca(2+) fluxes in vivo in the heart and vasculature of transgenic mice. Here we describe crystal structures of bright and dim states of GCaMP2 that reveal a sophisticated molecular mechanism for Ca(2+) sensing. In the bright state, CaM stabilizes the fluorophore in an ionized state similar to that observed in EGFP. Mutational analysis confirmed critical interactions between the fluorophore and elements of the fused peptides. Solution scattering studies indicate that the Ca(2+)-free form of GCaMP2 is a compact, predocked state, suggesting a molecular basis for the relatively rapid signaling kinetics reported for this indicator. These studies provide a structural basis for the rational design of improved Ca(2+)-sensitive probes. Structural Basis for Calcium Sensing by GCaMP2.,Wang Q, Shui B, Kotlikoff MI, Sondermann H Structure. 2008 Dec 12;16(12):1817-27. PMID:19081058 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Calmodulin Green Fluorescent Protein

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