3geg

Fingerprint and Structural Analysis of a SCOR enzyme with its bound cofactor from Clostridium thermocellum

spinqualitylabelsall models 3geg, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3geg is a 2 chain structure with sequence from Acetivibrio thermocellus ATCC 27405. This structure supersedes the now removed PDB entry 3dij. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.102Å Ligands: GOL, NA, NAD, THJ Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A3DFK9_ACET2 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 We have identified a highly conserved fingerprint of 40 residues in the TGYK subfamily of the short-chain oxidoreductase enzymes. The TGYK subfamily is defined by the presence of an N-terminal TGxxxGxG motif and a catalytic YxxxK motif. This subfamily contains more than 12,000 members, with individual members displaying unique substrate specificities. The 40 fingerprint residues are critical to catalysis, cofactor binding, protein folding, and oligomerization but are substrate independent. Their conservation provides critical insight into evolution of the folding and function of TGYK enzymes. Substrate specificity is determined by distinct combinations of residues in three flexible loops that make up the substrate-binding pocket. Here, we report the structure determinations of the TGYK enzyme A3DFK9 from Clostridium thermocellum in its apo form and with bound NAD(+) cofactor. The function of this protein is unknown, but our analysis of the substrate-binding loops putatively identifies A3DFK9 as a carbohydrate or polyalcohol metabolizing enzyme. C. thermocellum has potential commercial applications because of its ability to convert biomaterial into ethanol. A3DFK9 contains 31 of the 40 TGYK subfamily fingerprint residues. The most significant variations are the substitution of a cysteine (Cys84) for a highly conserved glycine within a characteristic VNNAG motif, and the substitution of a glycine (Gly106) for a highly conserved asparagine residue at a helical kink. Both of these variations occur at positions typically participating in the formation of a catalytically important proton transfer network. An alternate means of stabilizing this proton wire was observed in the A3DFK9 crystal structures. Sequence fingerprint and structural analysis of the SCOR enzyme A3DFK9 from Clostridium thermocellum.,Huether R, Liu ZJ, Xu H, Wang BC, Pletnev VZ, Mao Q, Duax WL, Umland TC Proteins. 2010 Feb 15;78(3):603-13. PMID:19774618 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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