residue T181 becomes acetylated and the carbonyl oxygen of the acyl-enzyme complex is located in an oxyanion hole and positioned to hydrogen bond with the backbone amide-NH of G112 and the alcohol of T111. Presence of two distinct acyl-enzyme complex structures which can interconvert by movement of the T111 side-chain alcohol hydrogen away from the oxyanion hole to hydrogen bond with the backbone carbonyl of the acylated residue, T181
the domain 1 of the enzyme has a socalled DOM-fold, which is a structure with crossing loops with a two-layered beta/alpha architecture of particular topology, also found in the L-aminopeptidase D-Ala-esterase/amidase and the molybdenum cofactor-binding domain, structure-function relationship, comparison of sequence basis for the structure by multiple amino acid sequence alignment, overview
the two subunits withj molecular masses of 21300 Da and 23500 Da are derived from a single precursor polypeptide, suggesting that the CLGAT precursor is cleaved autocatalytically at the conserved ATML motif. The first 26-amino acid sequence at the N-terminus of the precursor functions as a chloroplast transit peptide
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crystal structures of Mtb OAT in native form and in its complex with ornithine has been determined at 1.7 and 2.4 A resolutions, respectively. Ornithine binding does not alter the structure of Mtb OAT globally. Its presence stabilizes the three C-terminal residues that are disordered and not observed in the native structure. Stabilization of the C-terminal residues by ornithine reduces the size of the active-site pocket volume in the structure of the ORN complex. The interactions of ORN and the protein residues of Mtb OAT unambiguously delineate the active-site residues of this enzyme in Mtb.
crystals grown by either the batch or hanging-drop vapour-diffusion method. The crystals belong to space group P4, with unit-cell parameters a = b = 66.98, c = 427.09 A. The use of the counterdiffusion technique is critical for the production of well ordered crystals
crystallization of OAT2 in the presence of N-alpha-acetyl-L-glutamate leads to a structure in which residue T181 is acetylated, the carbonyl oxygen of the acyl-enzyme complex is located in an oxyanion hole and positioned to hydrogen bond with the backbone amide-NH of G112 and the alcohol of T111. Presence of two distinct acyl-enzyme complex structures. The two acyl-enzyme complex structures can interconvert by movement of the T111 side-chain alcohol hydrogen away from the oxyanion hole to hydrogen bond with the backbone carbonyl of the acylated residue, T181
crystals of OAT2 in complex with L-Glu are generated. Optimization of crystallization conditions lead to a 2.7 A resolution structure for OAT2 acylated at Thr-181 and in complex with L-Glu (referred to as the acetyl-OAT2-glutamate complex)
purified recombinant native and selenomethionine-labeled enzymes, hanging drop vapour diffusion method, 12 mg/ml protein in 1.1-1.3 M ammonium sulfate, 0.04 M ammonium phosphate, 0.1 M Tris-HCl, pH 8.0, and 5-8% v/v glycerol, and in case of SeMet-enzyme 5 mM DTT, cryoprotection by 25% glycerol and 2.0 M ammonium sulfate, X-ray diffraction structure determination and analysis at 2.8 A resolution
change of resiude to the corresponding residue in an arginine-resistant Escherichia coli mutant. Mutation leads to partial inhibition of both synthase and kinase activities by arginine and decrease in synthase activity
inactivation of regulatory repressor argR gene and overexpression of argJ gene, argJ overexpression leads to decreased ornithine acetyltransferase activity due to product inhibition by L-ornithine; L-citrulline overproduction in Corynebacterium glutamicum engineered strain correlates with expression levels of ArgJ, which plays a vital role in the L-citrulline biosynthesis