1kc3: Difference between revisions

[[Image:1kc3.jpg|left|200px]]<br /><applet load="1kc3" size="350" color="white" frame="true" align="right" spinBox="true"  

dTDP-6-deoxy-L-lyxo-4-hexulose reductase (RmlD) catalyzes the final step in the conversion of dTDP-D-glucose to dTDP-L-rhamnose in an NAD(P)H- and Mg2+-dependent reaction. L-rhamnose biosynthesis is an antibacterial target. The structure of RmlD from Salmonella enterica serovar Typhimurium has been determined, and complexes with NADH, NADPH, and dTDP-L-rhamnose are reported. RmlD differs from other short chain dehydrogenases in that it has a novel dimer interface that contains Mg2+. Enzyme catalysis involves hydride transfer from the nicotinamide ring of the cofactor to the C4'-carbonyl group of the substrate. The substrate is activated through protonation by a conserved tyrosine. NAD(P)H is bound in a solvent-exposed cleft, allowing facile replacement. We suggest a novel role for the conserved serine/threonine residue of the catalytic triad of SDR enzymes.

1KC3 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Salmonella_typhimurium Salmonella typhimurium] with <scene name='pdbligand=MG:'>MG</scene>, <scene name='pdbligand=NDP:'>NDP</scene> and <scene name='pdbligand=TRH:'>TRH</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/dTDP-4-dehydrorhamnose_reductase dTDP-4-dehydrorhamnose reductase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.1.1.133 1.1.1.133] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KC3 OCA].  

[[Category: Giraud, M F.]]

[[Category: Kerr, I D.]]

[[Category: Leonard, G A.]]

[[Category: McMiken, H J.]]

[[Category: Naismith, J H.]]

''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:32:26 2008''