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. 1986 Jun;166(3):1013–1021. doi: 10.1128/jb.166.3.1013-1021.1986

Pleiotropic effects induced by modification deficiency next to the anticodon of tRNA from Salmonella typhimurium LT2.

J U Ericson, G R Björk
PMCID: PMC215226  PMID: 2423501

Abstract

A strain of Salmonella typhimurium LT2 was isolated, which harbors a mutation acting as an antisuppressor toward an amber suppressor derivative, supF30, of tRNATyr1. The mutant is deficient in cis-2-methylthioribosylzeatin[N6-(4-hydroxyisopentenyl)-2-me thylthioadenosine, ms2io6A], which is a modification normally present next to the anticodon (position 37) in tRNA reading codons starting with uridine. The gene miaA, defective in the mutant, is located close to and counterclockwise of the purA gene at 96 min on the chromosomal map of S. typhimurium with the gene order mutL miaA purA. Growth rate of the mutant was reduced 20 to 50%, and the effect was more pronounced in media supporting fast growth. Translational chain elongation rate at 37 degrees C was reduced from 16 amino acids per s in the wild-type cell to 11 amino acids per s in the miaA1 mutant in the four different growth media tested. The cellular yield in limiting glucose, glycerol, or succinate medium was reduced for the miaAI mutant compared with wild-type cells, with 49, 41, and 57% reductions, respectively. The miaAI mutation renders the cell more sensitive or resistant toward several amino acid analogs, suggesting that the deficiency in ms2io6A influences the regulation of several amino acid biosynthetic operons. We suggest that tRNAPhe, lacking ms2io6A, translates a UUU codon in the early histidine leader sequence with lowered efficiency, leading to repression of the his operon.

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