5b4i

Crystal structure of I86D mutant of phycocyanobilin:ferredoxin oxidoreductase in complex with biliverdin (data 2)

spinqualitylabelsall models 5b4i, resolution 1.11Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5b4i is a 1 chain structure with sequence from Synechocystis sp. PCC 6803. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.11Å Ligands: BLA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PCYA_SYNY3 Catalyzes the four-electron reduction of biliverdin IX-alpha (2-electron reduction at both the A and D rings); the reaction proceeds via an isolatable 2-electron intermediate, 181,182-dihydrobiliverdin (By similarity). Publication Abstract from PubMed Phycocyanobilin:ferredoxin oxidoreductase (PcyA) catalyzes the reduction of biliverdin (BV) to produce phycocyanobilin, a linear tetrapyrrole pigment used for light harvesting and light sensing. Spectroscopic and HPLC analyses inidicate that BV bound to the I86D mutant of PcyA is fully protonated (BVH+ ) and can accept an electron, but I86D is unable to donate protons for the reduction; therefore, compared to the wild-type PcyA, the I86D mutant stabilizes BVH+ . To elucidate the structural basis of the I86D mutation, we determined the atomic-resolution structure of the I86D-BVH+ complex and the protonation states of the essential residues Asp105 and Glu76 in PcyA. Our study revealed that Asp105 adopted a fixed conformation in the I86D mutant, although it had dual conformations in wild-type PcyA which reflected the protonation states of BV. Taken together with biochemical/spectroscopic results, our analysis of the I86D-BVH+ structure supports the hypothesis that flexibility of Asp105 is essential for the catalytic activity of PcyA. Atomic-resolution structure of the phycocyanobilin:ferredoxin oxidoreductase I86D mutant in complex with fully protonated biliverdin.,Hagiwara Y, Wada K, Irikawa T, Sato H, Unno M, Yamamoto K, Fukuyama K, Sugishima M FEBS Lett. 2016 Oct;590(19):3425-3434. doi: 10.1002/1873-3468.12387. Epub 2016, Sep 18. PMID:27596987 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Phycocyanobilin:ferredoxin oxidoreductase

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