title: Control of arginine biosynthesis in Escherichia coli: characterization of arginyl-transfer ribonucleic acid synthetase mutants.
abstract: The arginyl-transfer ribonucleic acid (Arg-tRNA) synthetase (EC 6.1.1.13, arginine: RNA ligase adenosine monophosphate) mutants, exhibiting nonrepressible synthesis of arginine by exogenous arginine, were employed in studies of several biochemical properties. Two of these mutants possessed Arg-tRNA synthetases with a reduced affinity for arginine, and this enzyme of another mutant had a reduced affinity for arginine-tRNA (tRNA(arg)). The mutant possessing an Arg-tRNA synthetase with an altered K(m) for tRNA(arg) was found to have reduced in vivo aminoacylation of two of the five isoaccepting species of tRNA(arg) and complete absence of aminoacylation of one of the isoaccepting species.
mesh_terms: D000215:Acylation; D000255:Adenosine Triphosphate / Q000378:metabolism; D000581:Amidohydrolases / Q000378:metabolism; D000604:Amino Acyl-tRNA Synthetases / Q000096:biosynthesis* / Q000378:metabolism; D001120:Arginine / Q000096:biosynthesis* / Q000378:metabolism; D002172:Canavanine / Q000494:pharmacology; D002247:Carbon Isotopes; D002474:Cell-Free System; D002845:Chromatography; D004352:Drug Resistance, Microbial; D004794:Enzyme Repression; D004926:Escherichia coli / Q000187:drug effects / Q000201:enzymology / Q000254:growth & development / Q000378:metabolism*; D009154:Mutation; D009952:Ornithine; D009954:Ornithine Carbamoyltransferase / Q000378:metabolism; D012343:RNA, Transfer / Q000378:metabolism; D013237:Stereoisomerism; D014316:Tritium
chemical_list: D002247:Carbon Isotopes; D014316:Tritium; D002172:Canavanine; D000255:Adenosine Triphosphate; D012343:RNA, Transfer; D001120:Arginine; D009952:Ornithine; D009954:Ornithine Carbamoyltransferase; D000581:Amidohydrolases; D000604:Amino Acyl-tRNA Synthetases