3gfb

L-Threonine Dehydrogenase (TkTDH) from the hyperthermophilic archaeon Thermococcus kodakaraensis

spinqualitylabelsall models 3gfb, resolution 2.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3gfb is a 4 chain structure with sequence from Thermococcus kodakarensis KOD1. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.4Å Ligands: NAD, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function TDH_THEKO 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 The X-ray structure of the holo-form of l-threonine dehydrogenase (TDH) from Thermococcus kodakaraensis (TkTDH) has been determined at 2.4A resolution. TDH catalyses the NAD(+)-dependent oxidation of l-threonine to 2-amino-3-ketobutyrate, and is one of the first enzymes in this family to be solved by X-ray crystallography. The enzyme is a homo-tetramer, each monomer consisting of 350 amino acids that form two domains; a catalytic domain and a nicotinamide co-factor (NAD(+))-binding domain, which contains an alpha/beta Rossmann fold motif. An extended twelve-stranded beta-sheet is formed by the association of pairs of monomers in the tetramer. TkTDH shows strong overall structural similarity to TDHs from thermophiles and alcohol dehydrogenases (ADH) from lower life forms, despite low sequence homology, exhibiting the same overall fold of the monomer and assembly of the tetramer. The structure reveals the binding site of the essential co-factor NAD(+) which is present in all subunits. Docking studies suggest a mode of interaction of TDH with 2-amino-3-ketobutyrate CoA ligase, the subsequent enzyme in the pathway for conversion of threonine to glycine. TDH is known to form a stable functional complex with 2-amino-3-ketobutyrate ligase, most probably to shield an unstable intermediate. Structure and function of the l-threonine dehydrogenase (TkTDH) from the hyperthermophilic archaeon Thermococcus kodakaraensis.,Bowyer A, Mikolajek H, Stuart JW, Wood SP, Jamil F, Rashid N, Akhtar M, Cooper JB J Struct Biol. 2009 Nov;168(2):294-304. Epub 2009 Jul 16. PMID:19616102 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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