2dd7

A GFP-like protein from marine copepod, Chiridius poppei

spinqualitylabelsall models 2dd7, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2dd7 is a 2 chain structure with sequence from Chiridius poppei. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.9Å Ligands: CL, CR2, CXS Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q2MHN7_9MAXI 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 The fluorescence excitation and emission maxima of a GFP-like protein from the marine copepod Chiridius poppei (CpYGFP) show a significant red shift (lambda(ex) = 509 nm, lambda(em) = 517 nm) compared with those of GFP from Aequorea victoria (avGFP) and other GFP-like proteins from marine copepods. We performed crystallographic and biochemical studies to understand why this shift occurs in CpYGFP. The structure of CpYGFP showed that the imidazole side chain of His52 is involved in stacking on the phenol moiety of the chromophore. We investigated the potential role of His52 in causing the red-shifted spectral properties by performing mutational analyses of H52T, H52D and H52F. The emission wavelengths of H52T and H52D were blue-shifted and that of H52F was red-shifted relative to the wild type. Comparison of its structure of another copepod GFP (ppluGFP2) having an emission maximum at 502 nm showed that the imidazole ring of His54 (corresponding to His52 in CpYGFP) is flipped out of the stacking position with the chromophore. These findings suggest that pi-pi stacking interaction between His52 and the phenol moiety of the chromophore is the likely cause of the red-shift in light emission. Structural basis for red-shifted emission of a GFP-like protein from the marine copepod Chiridius poppei.,Suto K, Masuda H, Takenaka Y, Tsuji FI, Mizuno H Genes Cells. 2009 Jun;14(6):727-37. Epub 2009 May 14. PMID:19469881 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Green Fluorescent Protein 3D structures

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