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. 1974 Feb;117(2):351–359. doi: 10.1128/jb.117.2.351-359.1974

Three Different Missense Suppressor Mutations Affecting the tRNAGGGGly Species of Escherichia coli

C W Hill 1, Gabriele Combriato 1, William Dolph 1
PMCID: PMC285521  PMID: 4590463

Abstract

The Escherichia coli suppressor mutation, supT, has been shown to cause a C → U substitution in the middle position of the tRNAGGGGly anticodon. This is the same tRNA species that is altered by the glyUsuAGA mutation studied previously. This finding indicates that the supT mutant tRNA reads the glutamic acid codon, GAG. The supT suppressor has also been converted to a new suppressor, called glyUsuGAA, which will suppress the GAA mutation, trpA46. The in vivo suppression efficiencies of each of these three missense suppressors has been measured and are as follows: glyUsuAGA, 3.6%; supT, 1.6%; and glyUsuGAA, 0.4%. Mistranslation by these mutant glycine tRNA species has no adverse affects on cell growth since cultures possessing the suppressors grow as fast as cells without. The supT tRNA species can be observed as a peak in the profile of glycyl-tRNA fractionated on a RPC-5 chromatographic column, indicating that the mutant tRNA can be aminoacylated with reasonable efficiency. This finding contrasts with previous findings concerning the glyUsuAGA mutant tRNA which is not significantly aminoacylated under the same conditions.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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