Nucleic Acids Research, 1981, Vol. 9, No. 13 3077-3088
© 1981
MOLECULAR BIOLOGY |
Yeast ochre suppressor SUQ5-ol is an altered tRNAUCASer
,*
Botany School Oxford OX1 3RA, UK
*Howard Hughes Medical Institute, Department of Biology, University of Utah Salt Lake City, UT 84112, USA
+Department of Biochemistry, University College London WC1E 68T, UK
**Department of Biochemistry and Biophysics, University of California San Francisco, CA 94143
Received March 27, 1981.
Ochre suppressor tRNA was partially purified from strains of Saccharomyces cerevisiae containing the serine-inserting class III suppressor SUQ5-ol. RNA sequence analysis of this tRNA indicates that the suppressor is derived from a UCA-decoding tRNASer by a G
U substitution in the middle position of the anticodon. The suppressor further differs from the wild-type UCA-decoding tRNASer in that the mutant anticodon lacks the modified uridine found in the wobble position of the wild-type tRNA and contains instead another modification in or near the anticodon.
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