2gw4
Crystal structure of stony coral fluorescent protein Kaede, red form
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OverviewOverview
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.
About this StructureAbout this Structure
2GW4 is a Protein complex structure of sequences from Trachyphyllia geoffroyi with as ligand. Full crystallographic information is available from OCA.
ReferenceReference
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
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