3ddn

Crystal structure of hydroxypyruvic acid phosphate bound D-3-phosphoglycerate dehydrogenase in mycobacterium tuberculosis

spinqualitylabelsall models 3ddn, resolution 2.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3ddn is a 2 chain structure with sequence from Mycobacterium tuberculosis. 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: HPV, TLA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function SERA_MYCTU 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 crystal structure of Mycobacterium tuberculosis d-3-phosphoglycerate dehydrogenase has been solved with bound effector, l-serine, and substrate, hydroxypyruvic acid phosphate, at resolutions of 2.7 and 2.4 A, respectively. The subunits display the same extreme asymmetry as seen in the apo-structure and provide insight into the mode of serine binding and closure of the active site. Mutagenesis studies confirm the identity of the main residues involved in serine binding and suggest that the poly glycine stretch in the loop that contains the locus for the 160 degrees rotation that leads to subunit asymmetry may have a larger role in folding than in catalysis. The lack of electron density for the cofactor, NADH, in any of the crystals examined led us to study binding by stopped flow kinetic analysis. The kinetic data suggest that productive NADH binding, that would support catalytic turnover, is dependent on the presence of substrate. This observation, along with the binding of substrate in the active site, but in an unproductive conformation, suggests a possible mechanism where initial binding of substrate leads to enhanced interaction with cofactor accompanied by a rearrangement of catalytically critical residue side chains. Furthermore, comparison to the structure of a truncated form of human d-3-phosphoglycerate dehydrogenase with cofactor and a substrate analog, provides insight into the conformational changes that occur during catalysis. Structural analysis of substrate and effector binding in Mycobacterium tuberculosis D-3-phosphoglycerate dehydrogenase.,Dey S, Burton RL, Grant GA, Sacchettini JC Biochemistry. 2008 Aug 12;47(32):8271-82. Epub 2008 Jul 16. PMID:18627175 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Phosphoglycerate dehydrogenase

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