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Evidence That the Majority of Leucine Transfer Ribonucleic Acid Is Not Involved in Repression in Salmonella typhimurium

¹ Department of Biochemistry, State University of New York at Stony Brook, Stony Brook, New York 11790

ABSTRACT

Leucine transfer ribonucleic acid (tRNA) was almost fully charged, and the isoleucine-valine and leucine enzymes remained derepressed when trifluoroleucine was added to a leucine auxotroph. High levels of charged leucine tRNA and derepression were also found in a leucyl-tRNA synthetase mutant.

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