5b46 | pdb_00005b46

2-Oxoacid:Ferredoxin Oxidoreductase 2 from Sulfolobus tokodai - ligand free form

spinqualitylabelsall models 5b46, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5b46 is a 2 chain structure with sequence from Sulfurisphaera tokodaii str. 7. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.1Å Ligands: MG, TPP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function OFOA2_SULTO Catalyzes the coenzyme A-dependent oxidative decarboxylation of different 2-oxoacids such as 2-oxoglutarate, pyruvate and 2-oxobutyrate to form their CoA derivatives. Publication Abstract from PubMed As the first three-dimensional structure of the two-subunit type 2-oxoacid:ferredoxin oxidoreductases (OFOR) from archaea, we solved the crystal structures of STK_23000/STK_22980 (StOFOR1) and STK_24350/STK_24330 (StOFOR2) from Sulfolobus tokodaii. They showed similar overall structures, consisting of two a- and b-subunit heterodimers containing thiamin pyrophosphate (TPP) cofactor and [4Fe-4S] cluster, but lack an intramolecular ferredoxin domain. Unlike other OFORs, StOFORs can utilize both pyruvate and 2-oxoglutarate, playing a key role in the central metabolism. In the structure of StOFOR2 in unreacted pyruvate complex form, carboxylate group of pyruvate is recognized by Arg344 and Thr257 from the a-subunit, which are conserved in pyruvate:ferredoxin oxidoreductase from Desulfovbrio africanus (DaPFOR). In the structure of StOFOR1 co-crystallized with 2-oxobutyrate, electron density corresponding to a 1-hydroxypropyl group (post-decarboxylation state) was observed at the thiazole ring of TPP. The binding pockets of the StOFORs surrounding the methyl or propyl group of the ligands are wider than that of DaPFOR. Mutational analyses indicated that several residues were responsible for the broad 2-oxoacid specificity of StOFORs. We also constructed a possible complex structural model by placing a Zn(2+)-containing dicluster ferredoxin of S. tokodaii into the large pocket of StOFOR2, providing insight into the electron transfer between the two redox proteins. Crystal structures of archaeal 2-oxoacid:ferredoxin oxidoreductases from Sulfolobus tokodaii.,Yan Z, Maruyama A, Arakawa T, Fushinobu S, Wakagi T Sci Rep. 2016 Sep 13;6:33061. doi: 10.1038/srep33061. PMID:27619895 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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