3itl

Crystal structure of Pseudomonas stutzeri L-rhamnose isomerase mutant D327N in complex with L-rhamnulose

spinqualitylabelsall models 3itl, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3itl is a 4 chain structure with sequence from Pseudomonas stutzeri. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.7Å Ligands: LRH, MN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q75WH8_STUST 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-Rhamnose isomerase (L-RhI) catalyzes the reversible isomerization of L-rhamnose to L-rhamnulose. Pseudomonas stutzeril-RhI, with a broad substrate specificity, can catalyze not only the isomerization of L-rhamnose, but also that between D-allose and D-psicose. For the aldose-ketose isomerization by L-RhI, a metal-mediated hydride-shift mechanism has been proposed, but the catalytic mechanism is still not entirely understood. To elucidate the entire reaction mechanism, the X-ray structures of P. stutzeril-RhI in an Mn(2+)-bound form, and of two inactive mutant forms of P. stutzeril-RhI (S329K and D327N) in a complex with substrate/product, were determined. The structure of the Mn(2+)-bound enzyme indicated that the catalytic site interconverts between two forms with the displacement of the metal ion to recognize both pyranose and furanose ring substrates. Solving the structures of S329K-substrates allowed us to examine the metal-mediated hydride-shift mechanism of L-RhI in detail. The structural analysis of D327N-substrates and additional modeling revealed Asp327 to be responsible for the ring opening of furanose, and a water molecule coordinating with the metal ion to be involved in the ring opening of pyranose. Catalytic reaction mechanism of Pseudomonas stutzeri L-rhamnose isomerase deduced from X-ray structures.,Yoshida H, Yamaji M, Ishii T, Izumori K, Kamitori S FEBS J. 2010 Feb;277(4):1045-57. Epub 2010 Jan 20. PMID:20088877 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also L-rhamnose isomerase

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