Site-directed Mutagenesis of the Binding Site for Ribosomal Protein S8 Within 16S Ribosomal RNA from Escherichia Coli

Overview

Journal Nucleic Acids Res

Publisher Oxford University Press

Specialty Biochemistry

Date 1986 Jul 25

PMID 3016664

Citations 11

Authors

R J Gregory

R A Zimmermann

Affiliations

Soon will be listed here.

Abstract

Twelve specific alterations have been introduced into the binding site for ribosomal protein S8 in Escherichia coli 16S rRNA. Appropriate rDNA segments were first cloned into bacteriophage M13 vectors and subjected to bisulfite and oligonucleotide-directed mutagenesis in vitro. Subsequently, the mutagenized sequences were placed within the rrnB operon of plasmid pNO1301 and the mutant plasmids were used to transform E. coli recipients. The growth rates of cells containing the mutant plasmids were determined and compared with that of cells containing the wild-type plasmid. Only those mutations which occurred at highly conserved positions, or were expected to disrupt the secondary structure of the binding site, increased the doubling time appreciably. The most striking changes in growth rate resulted from mutations that altered a small internal loop within the S8 binding site. This structure is phylogenetically conserved in prokaryotic 16S rRNAs and may play a direct role in S8-16S rRNA recognition and interaction.

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