Abstract
A plasmid carrying a mutation in the highly conserved base U2555 in Escherichia coli 23S rRNA was isolated by selecting for suppression of the -1 frameshift mutation trpE91. U2555 is normally protected in chemical footprinting experiments by the aminoacyl residue of A-site-bound tRNA. Substitution of U2555 by adenine or guanine (but not by cytosine) increased readthrough of all three stop codons and +1 and -1 frameshifting. These effects on translational fidelity demonstrate the importance of U2555 for selection of the correct tRNA at the ribosomal A site.
Publication types
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Amino Acid Sequence
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Base Composition
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Base Sequence
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Codon / genetics
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Conserved Sequence*
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Escherichia coli / genetics
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Escherichia coli / metabolism*
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Escherichia coli / radiation effects
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Frameshift Mutation*
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Kanamycin Resistance / genetics
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Molecular Sequence Data
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Mutagenesis
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Mutagenesis, Insertional
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Nucleic Acid Conformation
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Operon
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Protein Biosynthesis*
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R Factors
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RNA, Ribosomal, 23S / chemistry
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RNA, Ribosomal, 23S / genetics*
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RNA, Ribosomal, 23S / metabolism*
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Restriction Mapping
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Ultraviolet Rays
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Uracil*
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beta-Galactosidase / genetics
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beta-Galactosidase / metabolism
Substances
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Codon
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RNA, Ribosomal, 23S
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Uracil
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beta-Galactosidase