Publications

• GLUTAMYL AND GLUTAMINYL RIBONUCLEIC ACID SYNTHETASES OF ESCHERICHIA COLI W. SEPARATION, PROPERTIES, AND STIMULATION OF ADENOSINE TRIPHOSPHATE-PYROPHOSPHATE EXCHANGE BY ACCEPTOR RIBONUCLEIC ACID.

  RAVEL J.M., WANG S.F., HEINEMEYER C., SHIVE W.

  J Biol Chem 240:432-438(1965) [PubMed] [EuropePMC]

  This publication is cited by 1 other entry.

• Arc1p organizes the yeast aminoacyl-tRNA synthetase complex and stabilizes its interaction with the cognate tRNAs.

  Deinert K., Fasiolo F., Hurt E.C., Simos G.

  Eukaryotic aminoacyl-tRNA synthetases, in contrast to their prokaryotic counterparts, are often part of high molecular weight complexes. In yeast, two enzymes, the methionyl- and glutamyl-tRNA synthetases associate in vivo with the tRNA-binding protein Arc1p. To study the assembly and function of ... >> More

  Eukaryotic aminoacyl-tRNA synthetases, in contrast to their prokaryotic counterparts, are often part of high molecular weight complexes. In yeast, two enzymes, the methionyl- and glutamyl-tRNA synthetases associate in vivo with the tRNA-binding protein Arc1p. To study the assembly and function of this complex, we have reconstituted it in vitro from individually purified recombinant proteins. Our results show that Arc1p can readily bind to either or both of the two enzymes, mediating the formation of the respective binary or ternary complexes. Under competition conditions, Arc1p alone exhibits broad specificity and interacts with a defined set of tRNA species. Nevertheless, the in vitro reconstituted Arc1p-containing enzyme complexes can bind only to their cognate tRNAs and tighter than the corresponding monomeric enzymes. These results demonstrate that the organization of aminoacyl-tRNA synthetases with general tRNA-binding proteins into multimeric complexes can stimulate their catalytic efficiency and, therefore, offer a significant advantage to the eukaryotic cell. << Less

  J. Biol. Chem. 276:6000-6008(2001) [PubMed] [EuropePMC]

• The glutamyl-tRNA synthetase of Escherichia coli contains one atom of zinc essential for its native conformation and its catalytic activity.

  Liu J., Lin S.-X., Blochet J.-E., Pezolet M., Lapointe J.

  The glutamyl-tRNA synthetase of Escherichia coli contains one atom of zinc. This metal ion is strongly bound, as it is not removed by 8 M urea. Slow removal of the zinc at 4 degrees C in the presence of the specific chelating agent, 1,10-phenanthroline, is proportional to the loss of aminoacylatio ... >> More

  The glutamyl-tRNA synthetase of Escherichia coli contains one atom of zinc. This metal ion is strongly bound, as it is not removed by 8 M urea. Slow removal of the zinc at 4 degrees C in the presence of the specific chelating agent, 1,10-phenanthroline, is proportional to the loss of aminoacylation activity and to the presence of a more open conformer of the enzyme. This conformer migrates more slowly than the native enzyme during gel electrophoresis under nondenaturing conditions and binds tRNA(Glu). Infrared spectroscopy measurements show that it differs from the native enzyme by a lower alpha-helix content and a higher proportion of beta-sheet and unordered structures. ATP protects the enzyme against 1,10-phenanthroline-mediated zinc removal, suggesting that the zinc-binding region is closely associated with the catalytic site. Additional support for this conclusion comes from the presence of zinc in the 27-kDa N-terminal half of the enzyme and in a 10-kDa fragment. The latter is homologous to the tRNA acceptor helix binding domain of E. coli glutaminyl-tRNA synthetase. The presence of the conserved CYC motif in this domain of the zinc-containing glutamyl-tRNA synthetases of E. coli and Bacillus subtilis, and its absence in that of Thermus thermophilus and the E. coli glutaminyl-tRNA synthetase which do not contain zinc, suggest that the cysteines of this motif and the C- and H-rich 125CRHSHEHHX5C138 segment present in the 10-kDa zinc-binding fragment are involved in zinc binding by the glutamyl-tRNA synthetase of E. coli. << Less

  Biochemistry 32:11390-11396(1993) [PubMed] [EuropePMC]

• Aminoacyl-tRNA synthesis.

  Ibba M., Soll D.

  Aminoacyl-tRNAs are substrates for translation and are pivotal in determining how the genetic code is interpreted as amino acids. The function of aminoacyl-tRNA synthesis is to precisely match amino acids with tRNAs containing the corresponding anticodon. This is primarily achieved by the direct a ... >> More

  Aminoacyl-tRNAs are substrates for translation and are pivotal in determining how the genetic code is interpreted as amino acids. The function of aminoacyl-tRNA synthesis is to precisely match amino acids with tRNAs containing the corresponding anticodon. This is primarily achieved by the direct attachment of an amino acid to the corresponding tRNA by an aminoacyl-tRNA synthetase, although intrinsic proofreading and extrinsic editing are also essential in several cases. Recent studies of aminoacyl-tRNA synthesis, mainly prompted by the advent of whole genome sequencing and the availability of a vast body of structural data, have led to an expanded and more detailed picture of how aminoacyl-tRNAs are synthesized. This article reviews current knowledge of the biochemical, structural, and evolutionary facets of aminoacyl-tRNA synthesis. << Less

  Annu Rev Biochem 69:617-650(2000) [PubMed] [EuropePMC]

  This publication is cited by 26 other entries.