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• W1848720997 abstract "Two isoforms, L(1) and L(2), of L-amino acid oxidase have been isolated from Russell's viper venom by Sephadex G-100 gel filtration followed by CM-Sephadex C-50 ion exchange chromatography. The enzymes, with different isoelectric points, are monomers of 60-63 kDa as observed from size exclusion HPLC and SDS/PAGE. Partial N-terminal amino acid sequencing of L(1) and L(2) showed significant homology with other snake venom L-amino acid oxidases. Both the enzymes exhibit marked substrate preference for hydrophobic amino acids, maximum catalytic efficiency being observed with L-Phe. Inhibition of L(1) and L(2) by the substrate analogs N-acetyltryptophan and N-acetyl-L-tryptophan amide has been followed. The initial uncompetitive inhibition of L(1) followed by mixed inhibition at higher concentrations suggested the existence of two different inhibitor-binding sites distinct from the substrate-binding site. In the case of L(2), initial linear competitive inhibition followed by mixed inhibition suggested the existence of two nonoverlapping inhibitor-binding sites, one of which is the substrate-binding site. An inhibition kinetic study with O-aminobenzoic acid, a mimicking substrate with amino, carboxylate and hydrophobic parts, indicated the presence of three and two binding sites in L(1) and L(2), respectively, including one at the substrate-binding site. An inhibitor cross-competition kinetic study indicated mutually excluding binding between N-acetyltryptophan, N-acetyl-L-tryptophan amide and O-aminobenzoic acid in both the isoforms, except at the substrate-binding site of L(1). Binding of substrate analogs with different electrostatic and hydrophobic properties provides useful insights into the environment of the catalytic sites. Furthermore, it predicts the minimum structural requirement for a ligand to enter and anchor at the respective functional sites of LAAO that may facilitate the design of suicidal inhibitors." @default.
• W1848720997 created "2016-06-24" @default.
• W1848720997 creator A5009765380 @default.
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• W1848720997 date "2008-03-31" @default.
• W1848720997 modified "2023-10-14" @default.
• W1848720997 title "Two L-amino acid oxidase isoenzymes from Russell’s viper (Daboia russelli russelli) venom with different mechanisms of inhibition by substrate analogs" @default.
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• W1848720997 doi "https://doi.org/10.1111/j.1742-4658.2008.06362.x" @default.
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