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. 1984 May 25;12(10):4361–4375. doi: 10.1093/nar/12.10.4361

Point mutations in the middle of 16S ribosomal RNA of E. coli produced by deletion loop mutagenesis.

C Zwieb, A E Dahlberg
PMCID: PMC318837  PMID: 6328419

Abstract

Using the plasmid pKK3535 , which contains the rrnB operon of Escherichia coli in pBR322, a deletion mutation was constructed which lacks bases 822 to 874 in the middle of the 16S ribosomal RNA. This results in an "amputation" of a very distinct stem and loop structure in the RNA. By forming a heteroduplex between the deletion plasmid and the original pKK3535 and by modifying the single-stranded deletion loops with bisulfite, we produced plasmids containing one or two base changes at positions 839, 840, 841, 867 or 876. The clustering of the mutations near the top of the stem, and the inability to get base changes at other positions, suggests that single alterations at particular positions severely affect the formation of a functional ribosome. The ability to recover mutations at these positions is not determined by the secondary structure of the DNA during bisulfite mutagenesis. Restriction enzyme analysis of 12 revertants from a slow growing mutant (altered at positions 839 and 876) shows that they did not compensate for the mutation by re-establishing the original wild type sequence.

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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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