2cwf
From Proteopedia
Crystal Structure of delta1-piperideine-2-carboxylate reductase from Pseudomonas syringae complexed with NADPH
Structural highlights
Function[Q4U331_PSEUB] Catalyzes the reduction of both Delta(1)-pyrroline-2-carboxylate (Pyr2C) and Delta(1)-piperideine-2-carboxylate (Pip2C) to L-proline and L-pipecolate, respectively, using NADPH as the electron donor. Can catalyze the reverse oxidation reactions, albeit at a much lower rate. Is also able to catalyze in vitro the NADPH-dependent formation of N-methylalanine from pyruvate and N-methylamine; can act on other alpha-keto acids and specifically uses methylamine and not ammonia for these reductive amination reactions. Can use NADH instead of NADPH, although with much less efficiency.[1] 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 PubMedDelta(1)-Piperideine-2-carboxylate/Delta(1)-pyrroline-2-carboxylate reductase from Pseudomonas syringae pv. tomato belongs to a novel sub-class in a large family of NAD(P)H-dependent oxidoreductases distinct from the conventional MDH/LDH superfamily characterized by the Rossmann fold. We have determined the structures of the following three forms of the enzyme: the unliganded form, the complex with NADPH, and the complex with NADPH and pyrrole-2-carboxylate at 1.55-, 1.8-, and 1.7-A resolutions, respectively. The enzyme exists as a dimer, and the subunit consists of three domains; domain I, domain II (NADPH binding domain), and domain III. The core of the NADPH binding domain consists of a seven-stranded predominantly antiparallel beta-sheet fold (which we named SESAS) that is characteristic of the new oxidoreductase family. The enzyme preference for NADPH over NADH is explained by the cofactor binding site architecture. A comparison of the overall structures revealed that the mobile domains I and III change their conformations to produce the catalytic form. This conformational change plays important roles in substrate recognition and the catalytic process. The active site structure of the catalytic form made it possible to identify the catalytic Asp:Ser:His triad and investigate the catalytic mechanism from a stereochemical point of view. Crystal structures of Delta1-piperideine-2-carboxylate/Delta1-pyrroline-2-carboxylate reductase belonging to a new family of NAD(P)H-dependent oxidoreductases: conformational change, substrate recognition, and stereochemistry of the reaction.,Goto M, Muramatsu H, Mihara H, Kurihara T, Esaki N, Omi R, Miyahara I, Hirotsu K J Biol Chem. 2005 Dec 9;280(49):40875-84. Epub 2005 Sep 28. PMID:16192274[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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