3iqd | pdb_00003iqd
Structure of Octopine-dehydrogenase in complex with NADH and Agmatine
Structural highlights
Function[OCDH_PECMA] Catalyzes the reverse reaction of octopine dehydrogenation. Acts on L-arginine in preference to other substrates such as canavanine, cysteine, L-alanine, ornithine or norvaline, owing to the presence of the positively charged guanidium group.[1] [2] 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 PubMedOctopine dehydrogenase (OcDH) from the adductor muscle of the great scallop, Pecten maximus, catalyzes the NADH dependent, reductive condensation of L-arginine and pyruvate to octopine, NAD(+), and water during escape swimming and/or subsequent recovery. The structure of OcDH was recently solved and a reaction mechanism was proposed which implied an ordered binding of NADH, L-arginine and finally pyruvate. Here, the order of substrate binding as well as the underlying conformational changes were investigated by NMR confirming the model derived from the crystal structures. Furthermore, the crystal structure of the OcDH/NADH/agmatine complex was determined which suggests a key role of the side chain of L-arginine in protein cataylsis. Thus, the order of substrate binding to OcDH as well as the molecular signals involved in octopine formation can now be described in molecular detail. Insights into the mechanism of ligand binding to octopine dehydrogenase from Pecten maximus by NMR and crystallography.,Smits SH, Meyer T, Mueller A, van Os N, Stoldt M, Willbold D, Schmitt L, Grieshaber MK PLoS One. 2010 Aug 19;5(8):e12312. PMID:20808820[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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