5x5u | pdb_00005x5u
Crystal structure of alpha-ketoglutarate-semialdehyde dehydrogenase (KGSADH) complexed with NAD
Structural highlights
Function[KGSDH_AZOBR] Catalyzes the NAD(P)(+)-dependent oxidation of alpha-ketoglutaric semialdehyde (alphaKGSA) to alpha-ketoglutarate. Is involved in a degradation pathway of L-arabinose that allows A.brasilense to grow on L-arabinose as a sole carbon source. Prefers NAD(+) to NADP(+) as a cosubstrate. Displays broad substrate specificity: exhibits the highest activity with alphaKGSA and succinic semialdehyde as substrates, but to a lesser extent, is also active with glutaraldehyde, benzaldehyde, and a number of aldehydes from C3 to C8.[1] Publication Abstract from PubMed3-Hydroxypropionic acid (3-HP) is an important platform chemical to be converted to acrylic acid and acrylamide. Aldehyde dehydrogenase (ALDH), an enzyme that catalyzes the reaction of 3-hydroxypropionaldehyde (3-HPA) to 3-HP, determines 3-HP production rate during the conversion of glycerol to 3-HP. To elucidate molecular mechanism of 3-HP production, we determined the first crystal structure of a 3-HP producing ALDH, alpha-ketoglutarate-semialdehyde dehydrogenase from Azospirillum basilensis (AbKGSADH), in its apo-form and in complex with NAD+. Although showing an overall structure similar to other ALDHs, the AbKGSADH enzyme had an optimal substrate binding site for accepting 3-HPA as a substrate. Molecular docking simulation of 3-HPA into the AbKGSADH structure revealed that the residues Asn159, Gln160 and Arg163 stabilize the aldehyde- and the hydroxyl-groups of 3-HPA through hydrogen bonds, and several hydrophobic residues, such as Phe156, Val286, Ile288, and Phe450, provide the optimal size and shape for 3-HPA binding. We also compared AbKGSADH with other reported 3-HP producing ALDHs for the crucial amino acid residues for enzyme catalysis and substrate binding, which provides structural implications on how these enzymes utilize 3-HPA as a substrate. Structural insights into the production of 3-hydroxypropionic acid by aldehyde dehydrogenase from Azospirillum brasilense.,Son HF, Park S, Yoo TH, Jung GY, Kim KJ Sci Rep. 2017 Apr 10;7:46005. doi: 10.1038/srep46005. PMID:28393833[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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