2ib6

Structural characterization of a blue chromoprotein and its yellow mutant from the sea anemone cnidopus japonicus

spinqualitylabelsall models 2ib6, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2ib6 is a 8 chain structure with sequence from Epiactis japonica. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2Å Ligands: MSE, PO4, QLG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0AQQ8_EPIJA 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 Green fluorescent protein (GFP) and its relatives (GFP protein family) have been isolated from marine organisms such as jellyfish and corals that belong to the phylum Cnidaria (stinging aquatic invertebrates). They are intrinsically fluorescent proteins. In search of new members of the family of green fluorescent protein family, we identified a non-fluorescent chromoprotein from the Cnidopus japonicus species of sea anemone that possesses 45% sequence identity to dsRed (a red fluorescent protein). This newly identified blue color protein has an absorbance maximum of 610 nm and is hereafter referred to as cjBlue. Determination of the cjBlue 1.8 A crystal structure revealed a chromophore comprised of Gln(63)-Tyr(64)-Gly(65). The ring stacking between Tyr(64) and His(197) stabilized the cjBlue trans chromophore conformation along the Calpha2-Cbeta2 bond of 5-[(4-hydroxyphenyl)methylene]-imidazolinone, which closely resembled that of the "Kindling Fluorescent Protein" and Rtms5. Replacement of Tyr(64) with Leu in wild-type cjBlue produced a visible color change from blue to yellow with a new absorbance maximum of 417 nm. Interestingly, the crystal structure of the yellow mutant Y64L revealed two His(197) imidazole ring orientations, suggesting a flip-flop interconversion between the two conformations in solution. We conclude that the dynamics and structure of the chromophore are both essential for the optical appearance of these color proteins. Structural characterization of a blue chromoprotein and its yellow mutant from the sea anemone Cnidopus japonicus.,Chan MC, Karasawa S, Mizuno H, Bosanac I, Ho D, Prive GG, Miyawaki A, Ikura M J Biol Chem. 2006 Dec 8;281(49):37813-9. Epub 2006 Oct 6. PMID:17028187 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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