title: Aminoacylation of Phaseolus vulgaris cytoplasmic, chloroplastic and mitochondrial tRNAsMet and of Escherichia coli tRNAsMet by homologous and heterologous enzymes.
abstract: Met-tRNA synthetase from Paseolus vulgaris cytoplasm could be separated from its chloroplastic or mitochondrial counterpart by DEAE-cellulose chromatography, but the Met-tRNA synthetase from the two latter organelles could not be distinguished using DEAE-cellulose, hydroxyapatite or CM-Sephadex chromatography. As revealed by reverse-phase chromatography, bean cytoplasm contains 2 tRNAsMet; only one is charged by chloroplast, mitochondrial or Escherichia coli Met-tRNA synthetase. Mitochondria contain, in addition to the 2 cytoplasmic tRNAsMet, 3 mitochondria-spedific tRNAsMet; 2 can be formylated by the mitochondrial or the E. coli transformylase; all 3 are charged by mitochondrial, chloroplastic or E, coli Met-tRNA synthetase; none is charged by the cytoplasmic enzyme. Chloroplasts contain, in addition to the 2 cytoplasmic tRNAsMet, 3 chloroplast-specific tRNAsMet, different from the mitochondrial tRNAsMet; one is formylatable by the chloroplastic or the E. coli transformylase; all 3 are charged by chloroplastic, mitochondrial or E. coli Met-tRNA synthetase; only one is charged by the cytoplasmic enzyme. Of the 3 E. coli tRNAsMet, only the formylatable species can be charged by bean cytoplasmic, chloroplastic or mitochondrial Met-tRNA synthetase.
mesh_terms: D000604:Amino Acyl-tRNA Synthetases / Q000378:metabolism*; D002736:Chloroplasts / Q000201:enzymology*; D003593:Cytoplasm / Q000201:enzymology; D004926:Escherichia coli; D008715:Methionine; D008718:Methionine-tRNA Ligase / Q000302:isolation & purification / Q000378:metabolism*; D008928:Mitochondria / Q000201:enzymology; D010944:Plants / Q000201:enzymology*; D012329:RNA, Bacterial / Q000378:metabolism; D012343:RNA, Transfer / Q000302:isolation & purification / Q000378:metabolism*
chemical_list: D012329:RNA, Bacterial; D012343:RNA, Transfer; D008715:Methionine; D000604:Amino Acyl-tRNA Synthetases; D008718:Methionine-tRNA Ligase