Properties of rabbit liver tissue aminoacyl-tRNA synthetases, associated with polyribosomes, were studied under conditions of normal state and within 12 hrs after simulation of myocardium infarction. Under conditions of myocardium infarction the activity of some forms of aminoacyl-tRNA synthetase was decreased in polyribosomes and protein fractions, liberated from polyribosomes by means of washing with buffer containing 0.5 M KCl. Polyribosomes stimulated the synthetases and protected them from heat inactivation. Deterioration of the synthetases interaction with polyribosomes appears to be among the factors responsible for impairment of protein biosynthesis under conditions of myocardium infarction.
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