1lxy

Crystal Structure of Arginine Deiminase covalently linked with L-citrulline

spinqualitylabelsall models 1lxy, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1lxy is a 2 chain structure with sequence from Mycoplasmopsis arginini. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2Å Ligands: CIR, TRS Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ARCA_MYCAR 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 Arginine deiminase (ADI), an enzyme that hydrolyzes arginine to generate energy in many parasitic microorganisms, has potent anticancer activities and can halt growth of solid tumors. We determined the crystal structure of ADI from Mycoplasma arginini in two different forms (1.6 and 2.0 A resolution) using multiple isomorphous replacement. ADI shares common structural features with the arginine-catabolizing enzymes Arg:Gly amidinotransferase and dimethylarginine dimethyl-aminohydrolase; ADI contains an additional domain of five helices. The scissile C-N bonds of the substrates and the catalytic triads (Cys398-His269-Glu213 of ADI) for the three enzymes superimpose on each other. The ADI structure from form I crystals corresponds to a tetrahedral intermediate with four heteroatoms (1S, 2N, 1O) covalently bonded to the reaction-center carbon. The structure from form II crystals represents an amidino-enzyme complex; the reaction-center carbon is covalently bonded to Cys398 sulfur and two nitrogens, and the reacting water molecule is only 2.54 A away. Crystal structures of arginine deiminase with covalent reaction intermediates; implications for catalytic mechanism.,Das K, Butler GH, Kwiatkowski V, Clark AD Jr, Yadav P, Arnold E Structure. 2004 Apr;12(4):657-67. PMID:15062088 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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