1mb4 | pdb_00001mb4

Crystal structure of aspartate semialdehyde dehydrogenase from vibrio cholerae with NADP and S-methyl-l-cysteine sulfoxide

spinqualitylabelsall models 1mb4, resolution 1.84Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1mb4 is a 2 chain structure with sequence from Vibrio cholerae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.84Å Ligands: CYS, NDP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function DHAS1_VIBCH Catalyzes the NADPH-dependent formation of L-aspartate-semialdehyde (L-ASA) by the reductive dephosphorylation of L-aspartyl-4-phosphate. 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 L-Aspartate-beta-semialdehyde dehydrogenase (ASADH) catalyzes the reductive dephosphorylation of beta-aspartyl phosphate to L-aspartate-beta-semialdehyde in the aspartate biosynthetic pathway of plants and micro-organisms. The aspartate pathway produces fully one-quarter of the naturally occurring amino acids, but is not found in humans or other eukaryotic organisms, making ASADH an attractive target for the development of new antibacterial, fungicidal, or herbicidal compounds. We have determined the structure of ASADH from Vibrio cholerae in two states; the apoenzyme and a complex with NADP, and a covalently bound active site inhibitor, S-methyl-L-cysteine sulfoxide. Upon binding the inhibitor undergoes an enzyme-catalyzed reductive demethylation leading to a covalently bound cysteine that is observed in the complex structure. The enzyme is a functional homodimer, with extensive intersubunit contacts and a symmetrical 4-amino acid bridge linking the active site residues in adjacent subunits that could serve as a communication channel. The active site is essentially preformed, with minimal differences in active site conformation in the apoenzyme relative to the ternary inhibitor complex. The conformational changes that do occur result primarily from NADP binding, and are localized to the repositioning of two surface loops located on the rim at opposite sides of the NADP cleft. A structural basis for the mechanism of aspartate-beta-semialdehyde dehydrogenase from Vibrio cholerae.,Blanco J, Moore RA, Kabaleeswaran V, Viola RE Protein Sci. 2003 Jan;12(1):27-33. PMID:12493825 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Aspartate-semialdehyde dehydrogenase Aspartate-semialdehyde dehydrogenase 3D structures

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