The unusual recombinant plasmid pRC19 carrying the N-terminal fragment of the Escherichia coli RNA polymerase rpoB gene was found to specify high level rifampicin resistance of E. coli cells. Sequence analysis of this plasmid revealed one substitution only: transversion G----T, leading to amino acid
Primary structure of Escherichia coli RNA polymerase nucleotide substitution in the β subunit gene of the rifampicin resistant rpoB255 mutant
✍ Scribed by Ovchinnikov, Yu. A. ;Monastyrskaya, G. S. ;Gubanov, V. V. ;Lipkin, V. M. ;Sverdlov, E. D. ;Kiver, I. F. ;Bass, I. A. ;Mindlin, S. Z. ;Danilevskaya, O. N. ;Khesin, R. B.
- Publisher
- Springer
- Year
- 1981
- Tongue
- English
- Weight
- 609 KB
- Volume
- 184
- Category
- Article
- ISSN
- 0026-8925
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✦ Synopsis
The transducing phage 2 dsupM814 and the plasmid rpIK A l L rpo 8 plB1830 containing the wild-type rpoB gene have been constructed and the primary structure °f the gene's central fragment l l l has been established. In contrast with the wild-type, the gene g G C of the rpoB255 mutant, whose primary structure has been pub-~ lished, was found to contain an A.T.~T.A. transversion entailing the substitution of a valine residue for the aspartic acid residue (516) of the wild-type/3 subunit. rpo C ot Fig. 1. Restriction map of E. coli DNA within the rpoB gene. The sites for restriction endonucleases EeoRI (4,) and PstI (z~) are shown
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We studied the rate of synthesis of beta-and beta'-subunits of DNA-dependent RNA polymerase and the rate of beta-polypeptide mRNA synthesis in rifampicin-treated bacteria. The chosen antibiotic doses did not significantly inhibit the total RNA and protein synthesis in rifampicin-sensitive bacteria.
Bacteria with specific temperature sensitive lethal mutations in the gene for the beta' subunit of RNA polymerase synthesize both the beta and beta' subunits at a several fold higher rate at 42 degrees C than wild-type cells relative to total protein. Synthesis of the alpha and sigma subunits procee