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- W2406036835 abstract "By means of atomic absorption spectroscopy up to 0.9 Zn2+ atom per molecule of bovine tryptophanyl-tRNA-synthetase (E. C. 6.1.1.2) was found. Treatment of the enzyme with orthophenanthroline (Zn2+-chelating agent) or prolonged dialysis leading to the removal of bound Zn2+ causes inactivation of the enzyme whereas the addition of Zn2+ reactivates it. Kinetic analysis of the inhibiting action of orthophenanthroline at various concentrations of tryptophan, ATP and tRNA leads to the conclusion that removal of Zn2+ prevents the binding of the ATP molecule to tryptophanyl-tRNA-synthetase. By means of chemical modification it is shown that exposed histidine residues and the carboxylic groups of the enzyme participate in Zn2+ binding. According to circular dichroism data removal of Zn2+ has no influence on the secondary structure although some local alterations of the ternary structure are revealed." @default.
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- W2406036835 date "1981-09-01" @default.
- W2406036835 modified "2023-09-23" @default.
- W2406036835 title "[Role of zinc ions in the functioning of bovine tryptophanyl-tRNA-synthetase]." @default.
- W2406036835 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/7300822" @default.
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