5k0a

Structure of an oxidoreductase from Synechocystis sp. PCC6803

spinqualitylabelsall models 5k0a, resolution 1.71Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5k0a is a 4 chain structure with sequence from Synechocystis sp. PCC 6803 substr. Kazusa. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.706Å Ligands: 1PE, CSO, FAD, NO3, PG4, PGE, PO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function P74746_SYNY3 Publication Abstract from PubMed Flavoproteins participate in a wide variety of physiologically relevant processes that typically involve redox reactions. Within this protein superfamily, there exists a group that is able to transfer reducing equivalents from FAD to a redox-active disulfide bridge, which further reduces disulfide bridges in target proteins to regulate their structure and function. We have identified a previously undescribed type of flavin enzyme that is exclusive to oxygenic photosynthetic prokaryotes and that is based on the primary sequence that had been assigned as an NADPH-dependent thioredoxin reductase (NTR). However, our experimental data show that the protein does not transfer reducing equivalents from flavins to disulfides as in NTRs but functions in the opposite direction. High-resolution structures of the protein from Gloeobacter violaceus and Synechocystis sp. PCC6803 obtained by X-ray crystallography showed two juxtaposed FAD molecules per monomer in redox communication with an active disulfide bridge in a variant of the fold adopted by NTRs. We have tentatively named the flavoprotein "DDOR" (diflavin-linked disulfide oxidoreductase) and propose that its activity is linked to a thiol-based transfer of reducing equivalents in bacterial membranes. These findings expand the structural and mechanistic repertoire of flavoenzymes with oxidoreductase activity and pave the way to explore new protein engineering approaches aimed at designing redox-active proteins for diverse biotechnological applications. Unprecedented pathway of reducing equivalents in a diflavin-linked disulfide oxidoreductase.,Buey RM, Arellano JB, Lopez-Maury L, Galindo-Trigo S, Velazquez-Campoy A, Revuelta JL, de Pereda JM, Florencio FJ, Schurmann P, Buchanan BB, Balsera M Proc Natl Acad Sci U S A. 2017 Nov 13. pii: 201713698. doi:, 10.1073/pnas.1713698114. PMID:29133410 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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