3ksz

Crystal Structure of C151S+H178N mutant of Glyceraldehyde-3-phosphate-dehydrogenase 1 (GAPDH 1) from Staphylococcus aureus MRSA252 complexed with NAD and G3P

spinqualitylabelsall models 3ksz, resolution 2.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3ksz is a 4 chain structure with sequence from Staphylococcus aureus subsp. aureus MRSA252. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.6Å Ligands: 3PG, NAD Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function G3P1_STAAR 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 dreaded pathogen Staphylococcus aureus is one of the causes of morbidity and mortality worldwide. Glyceraldehyde-3-phosphate dehydrogenase (GAPDH), one of the key glycolytic enzymes, is irreversibly oxidized under oxidative stress and is responsible for sustenance of the pathogen inside the host. With an aim to elucidate the catalytic mechanism and identification of intermediates involved, we describe in this study different crystal structures of GAPDH1 from methicillin-resistant S. aureus MRSA252 (SaGAPDH1) in apo and holo forms of wild type, thioacyl intermediate, and ternary complexes of active-site mutants with physiological substrate d-glyceraldehyde-3-phosphate (G3P) and coenzyme NAD(+). A new phosphate recognition site, "new P(i)" site, similar to that observed in GAPDH from Thermotoga maritima, is reported here, which is 3.40 A away from the "classical P(i)" site. Ternary complexes discussed are representatives of noncovalent Michaelis complexes in the ground state. d-G3P is bound to all the four subunits of C151S.NAD and C151G.NAD in more reactive hydrate (gem-di-ol) form. However, in C151S+H178N.NAD, the substrate is bound to two chains in aldehyde form and in gem-di-ol form to the other two. This work reports binding of d-G3P to the C151G mutant in an inverted manner for the very first time. The structure of the thiaocyl complex presented here is formed after the hydride transfer. The C3 phosphate of d-G3P is positioned at the "P(s)" site in the ternary complexes but at the "new P(i)" site in the thioacyl complex and C1-O1 bond points opposite to His178 disrupting the alignment between itself and NE2 of His178. A new conformation (Conformation I) of the 209-215 loop has also been identified, where the interaction between phosphate ion at the "new P(i)" site and conserved Gly212 is lost. Altogether, inferences drawn from the kinetic analyses and crystal structures suggest the "flip-flop" model proposed for the enzyme mechanism. Crystal structure of glyceraldehyde-3-phosphate dehydrogenase 1 from methicillin-resistant Staphylococcus aureus MRSA252 provides novel insights into substrate binding and catalytic mechanism.,Mukherjee S, Dutta D, Saha B, Das AK J Mol Biol. 2010 Sep 3;401(5):949-68. Epub 2010 Jul 8. PMID:20620151 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Aldehyde dehydrogenase 3D structures Glyceraldehyde-3-phosphate dehydrogenase 3D structures

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