1an9
D-AMINO ACID OXIDASE COMPLEX WITH O-AMINOBENZOATE
Structural highlights
FunctionOXDA_PIG Regulates the level of the neuromodulator D-serine in the brain. Has high activity towards D-DOPA and contributes to dopamine synthesis. Could act as a detoxifying agent which removes D-amino acids accumulated during aging. Acts on a variety of D-amino acids with a preference for those having small hydrophobic side chains followed by those bearing polar, aromatic, and basic groups. Does not act on acidic amino acids. 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 PubMedAs an extension of our recent X-ray crystallographic determination of the tertiary structure of D-amino acid oxidase (DAO) [Mizutani, H. et al. (1996) J. Biochem. 120, 14-17], we solved the crystal structure of the complex of DAO with a substrate analog, o-aminobenzoate (OAB). The alignment between flavin and OAB in the crystal structure of the complex is consistent with charge-transfer interaction through the overlap between the highest occupied molecular orbital of OAB and the lowest unoccupied molecular orbital of flavin. Starting with the atomic coordinates of this complex as the initial model, we carried out molecular mechanics simulation for the DAO-D-leucine complex and thus obtained a model for the enzyme-substrate complex. According to the enzyme-substrate complex model, the alpha-proton is pointed toward N(5) of flavin while the lone-pair of the substrate amino group can approach C(4a) of flavin within an interacting distance. This model as well as DAO-OAB complex enables the evaluation of the substrate-flavin interaction prior to electron transfer from the substrate to flavin and provides two possible mechanisms for the reductive-half reaction of DAO, i.e., the electron-proton-electron transfer mechanism and the ionic mechanism. Structural and mechanistic studies on D-amino acid oxidase x substrate complex: implications of the crystal structure of enzyme x substrate analog complex.,Miura R, Setoyama C, Nishina Y, Shiga K, Mizutani H, Miyahara I, Hirotsu K J Biochem. 1997 Oct;122(4):825-33. PMID:9399588[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences | ||||||||||||||||||||
