3klc

Crystal structure of hyperthermophilic nitrilase

spinqualitylabelsall models 3klc, resolution 1.76Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3klc is a 2 chain structure with sequence from Pyrab. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACY, BR, MG NonStd Res: CSX Related: 3ivz, 3iw3, 3ki8 Gene: nit-30, PAB1449, PYRAB13990 (PYRAB) Activity: Beta-ureidopropionase, with EC number 3.5.1.6 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The nitrilase superfamily is a large and diverse superfamily of enzymes that catalyse the cleavage of various types of carbon-nitrogen bonds using a Cys-Glu-Lys catalytic triad. Thermoactive nitrilase from Pyrococcus abyssi (PaNit) hydrolyses small aliphatic nitriles like fumaro- and malononitryl. Yet, the biological role of this enzyme is unknown. We have analysed several crystal structures of PaNit: without ligands, with an acetate ion bound in the active site and with a bromide ion in the active site. In addition, docking calculations have been performed for fumaro- and malononitriles. The structures provide a proof for specific binding of the carboxylate ion and a general affinity for negatively changed ligands. The role of residues in the active site is considered and an enzymatic reaction mechanism is proposed in which Cys146 acts as the nucleophile, Glu42 as the general base, Lys113/Glu42 as the general acid, WatA as the hydrolytic water and Nzeta_Lys113 and N_Phe147 form the oxyanion hole. Crystallographic analysis of a thermoactive nitrilase.,Raczynska JE, Vorgias CE, Antranikian G, Rypniewski W J Struct Biol. 2011 Feb;173(2):294-302. Epub 2010 Nov 21. PMID:21095228 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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