title: Yeast phenylalanyl-tRNA synthetase: evidence for the formation of ADP by phosphorolysis of enzyme-bound aminoacyladenylate.
abstract: ADP and Ap3A are synthesized by the yeast phenylalanyl-tRNA synthetase, according to reaction pathways similar to the pyrophosphorolysis of the intermediate aminoacyladenylate or to the one leading to Ap4A synthesis. The enzyme-bound phenylalanyladenylate reacts with inorganic phosphate or ADP to yield, respectively, ADP or Ap3A. The rate of synthesis is strongly stimulated by Zn2+. This new phosphorolysis activity accounts for the complex pattern of bisnucleoside polyphosphate syntheses starting from ATP.
mesh_terms: D000244:Adenosine Diphosphate / Q000378:metabolism; D000249:Adenosine Monophosphate / Q000031:analogs & derivatives / Q000378:metabolism; D000255:Adenosine Triphosphate / Q000378:metabolism; D000604:Amino Acyl-tRNA Synthetases / Q000378:metabolism*; D007700:Kinetics; D010652:Phenylalanine-tRNA Ligase / Q000378:metabolism*; D010710:Phosphates / Q000378:metabolism; D011485:Protein Binding; D012441:Saccharomyces cerevisiae / Q000201:enzymology*; D015032:Zinc / Q000494:pharmacology
chemical_list: D010710:Phosphates; C026617:phenylalanyl adenylate; D000249:Adenosine Monophosphate; D000244:Adenosine Diphosphate; D000255:Adenosine Triphosphate; D000604:Amino Acyl-tRNA Synthetases; D010652:Phenylalanine-tRNA Ligase; D015032:Zinc