title: Incorporation of glutamic acid into protein by a soluble system.
abstract: A heat-labile, non-dialyzable factor(s) in soluble fractions from Escherichia coli strains and Bacillus subtilis was found to incorporate the radioactivity of [14C]glutamic acid into 95 degrees C CCl3COOH-insoluble fraction. Incorporation catalyzed by a partially purified factor from E. coli B required ATP, Mg2+, tRNA, casein, carbonate, and 2-mercaptoethanol. A mixture of nineteen amino acids other than glutamic acid had no effect on the incorporation. Heparin, spermine and monovalent cations were inhibitory. Incorporation proceeded via glutamyl-tRNA. The incorporation from [14C]glutamyl-tRNA required Mg2+, casein, carbonate, and 2-mercaptoethanol, and there was no incorporation from [14C]aspartyl-tRNA. The reaction product was identified as protein. The incorporated moiety was the glutamyl moiety of glutamic acid and it retained a free alpha-amino group in the product protein. The incorporating factor of E. coli B was demonstrated to be glutamyl-tRNA synthetase.
mesh_terms: D001412:Bacillus subtilis / Q000378:metabolism*; D001426:Bacterial Proteins / Q000096:biosynthesis*; D004926:Escherichia coli / Q000378:metabolism*; D005975:Glutamate-tRNA Ligase / Q000378:metabolism; D005971:Glutamates / Q000378:metabolism*; D018698:Glutamic Acid; D013997:Time Factors
chemical_list: D001426:Bacterial Proteins; D005971:Glutamates; D018698:Glutamic Acid; D005975:Glutamate-tRNA Ligase