2gw4

Crystal structure of stony coral fluorescent protein Kaede, red form

spinqualitylabelsall models 2gw4, resolution 1.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2gw4 is a 4 chain structure with sequence from Open brain coral. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: NI NonStd Res: NFA, RC7 Related: 2gw3 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT 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 A coral fluorescent protein from Trachyphyllia geoffroyi, Kaede, possesses a tripeptide of His62-Tyr63-Gly64, which forms a chromophore with green fluorescence. This chromophore's fluorescence turns red following UV light irradiation. We have previously shown that such photoconversion is achieved by a formal beta-elimination reaction, which results in a cleavage of the peptide bond found between the amide nitrogen and the alpha-carbon at His62. However, the stereochemical arrangement of the chromophore and the precise structural basis for this reaction mechanism previously remained unknown. Here, we report the crystal structures of the green and red form of Kaede at 1.4 A and 1.6 A resolutions, respectively. Our structures depict the cleaved peptide bond in the red form. The chromophore conformations both in the green and red forms are similar, except a well-defined water molecule in the proximity of the His62 imidazole ring in the green form. We propose a molecular mechanism for green-to-red photoconversion, which is assisted by the water molecule. Crystallographic evidence for water-assisted photo-induced peptide cleavage in the stony coral fluorescent protein Kaede.,Hayashi I, Mizuno H, Tong KI, Furuta T, Tanaka F, Yoshimura M, Miyawaki A, Ikura M J Mol Biol. 2007 Sep 28;372(4):918-26. Epub 2007 Jun 19. PMID:17692334 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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