Freist W, von der Haar F, Sprinzl M, Cramer F. Phenylalanyl-tRNA and seryl-tRNA synthetases from baker's yeast. Substrate specificity with regard to ATP analogs and mechanism of the aminoacylation reaction.
EUROPEAN JOURNAL OF BIOCHEMISTRY 1976;
64:389-93. [PMID:
776617 DOI:
10.1111/j.1432-1033.1976.tb10313.x]
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Abstract
Eighteen analogs of ATP have been tested in the aminoacylation reaction of phenylalanyl-tRNA and seryl-tRNA synthetases from baker's yeast. Four compounds are substrates for phenylalanyl-tRNA synthetase, five for seryl-tRNA synthetase, one compound is an inhibitor for both enzymes; their Km and Ki and V values have been determined. The substrate specificity shows that for the catalytic action of both enzymes with these substrates positions 6, 7, 8 and 9 of the purine moiety and positions 2' and 3' of the ribose moiety are important.
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