Section 44
Chapter 43,139

Fluorimetric study of the complex between yeast phenylalanyl-tRNA synthetase and tRNA-Phe. 2. Evidence for an asymmetric behaviour of the enzyme

Lefevre, J.F.; Ehrlich, R.; Remy, P.

European Journal of Biochemistry 103(1): 155-159


ISSN/ISBN: 0014-2956
PMID: 6987056
DOI: 10.1111/j.1432-1033.1980.tb04299.x
Accession: 043138846

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The variations of several spectroscopic properties of yeast tRNA-Phe and phenylalanyl-tRNA synthetase upon complex formation, were used to study the stoichiometry of the complex in different experimental conditions. In all cases, for the tRNA-Phe-enzyme complex, in the absence of other ligands, the saturations of the different conformational changes monitored for both macromolecules, are achieved at a 2:1 tRNA/enzyme stoichiometry. Phenylalanine does not modify this saturation. In contrast, the presence of 1 mM ATP induces an asymmetric behaviour of the synthetase: two tRNAs are still bound per enzyme molecule but the conformational change of the latter is completed upon binding of a single tRNA molecule.

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