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Nucleic Acids Research, 1983, Vol. 11, No. 23 8283-8286
© 1983

MOLECULAR BIOLOGY

supG and supL in Escherichia coli code for mutant lysine tRNAs+

Norman E. Prather, Betsy H. Mims and Emanuel J. Murgola

Department of Molecular Biology, University of Texas M.D. Anderson Hospital and Tumor Institute and University of Texas Graduate School of Biomedical Sciences Houston, TX 77030, USA

Received August 25, 1983. Accepted October 12, 1983.

We have determined the nucleotide sequences of lysine tRNAs isolated from strains containing one or the other of two Escherichia coli ochre suppressors, supG and supL. Each strain, besides producing wild-type lysine tRNA, has a mutant lysine tRNA species that apparently can read the polypeptide chain termination codons UAA and UAG. The mutant tRNAs from supG and supL strains are Identical. In each case the suppressor tRNA has an A36 for U36 nucleotide substitution. Furthermore, the hypermodified nucleoside at position 37 has been changed from t6A to ms2i6A.

+These results were reported at the 12th Annual Gulf Coast Molecular Biology Conference, Kerrville, Texas, January 27–29, 1983.


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