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J Bacteriol. 1975 October; 124(1): 92-98

Transductional mapping of gene trmA responsible for the production of 5-methyluridine in transfer ribonucleic acid of Escherichia coli.

ABSTRACT

The gene trmA, responsible for the production of 5-methyluridine (ribothymidine) in transfer ribonucleic acid, has been located at 79 min on the chromosomal map of Escherichia coli K-12. In five-factor crosses the gene order was shown to be argH-trmA-rif-thiA-metA. The co-transduction frequency between argH and trmA was 65%. Furthermore, the trmA5 mutation was shown to be recessive, in agreement with the notion that the trmA gene is the structural gene for the transfer tibonucleic acid (5-methyluridine) methyltransferase.

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