2koi

Refined solution structure of a cyanobacterial phytochrome GAF domain in the red light-absorbing ground state

spinqualitylabelsall models 2koi Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2koi is a 1 chain structure with sequence from Synechococcus sp. JA-2-3B'a(2-13). Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR, 20 models Ligands: CYC Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q2JIZ5_SYNJB 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 Phytochromes are a collection of bilin-containing photoreceptors that regulate numerous photoresponses in plants and microorganisms through their ability to photointerconvert between a red-light-absorbing, ground state (Pr) and a far-red-light-absorbing, photoactivated state (Pfr). Although the structures of several phytochromes as Pr have been determined, little is known about the structure of Pfr and how it initiates signalling. Here we describe the three-dimensional solution structure of the bilin-binding domain as Pfr, using the cyanobacterial phytochrome from Synechococcus OSB'. Contrary to predictions, light-induced rotation of the A pyrrole ring but not the D ring is the primary motion of the chromophore during photoconversion. Subsequent rearrangements within the protein then affect intradomain and interdomain contact sites within the phytochrome dimer. On the basis of our models, we propose that phytochromes act by propagating reversible light-driven conformational changes in the bilin to altered contacts between the adjacent output domains, which in most phytochromes direct differential phosphotransfer. Structural basis for the photoconversion of a phytochrome to the activated Pfr form.,Ulijasz AT, Cornilescu G, Cornilescu CC, Zhang J, Rivera M, Markley JL, Vierstra RD Nature. 2010 Jan 14;463(7278):250-4. PMID:20075921 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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