Summary
Deletions were constructed in plasmid pKK3535 in the coding region for the 3′-end of E. coli 16S rRNA. The plasmid was cleaved with restriction endonuclease Hae2 under conditions favoring the production of single cut linear plasmid DNA and deletions were produced by digestion with exonuclease Bal31. Seven different deletions were isolated ranging in size from 90 to about 200 base pairs. Transcription of ribosomal DNA, processing of ribosomal RNA and incorporation of mutant rRNA into mutant particles was studied in UV-sensitive cells using a modified maxicell labeling procedure. The different mutants were missing defined features in the secondary structure of 16S rRNA and were characterized according to their stability, ability to be processed, sensitivity to colicin E3, and ablity to bind ribosomal protein S1 and to interact with 50S subunits. These analyses show that the small stem and loop structure at positions 1350 to 1372 is necessary for the stability of rRNA. The deletion of the long terminal stem structure (1409–1491) in all mutant rRNAs does not block processing of the mutant rRNAs or S1 binding, although it does prevent the association of particles containing the mutant rRNA with 50S subunits.
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Zwieb, C., Jemiolo, D.K., Jacob, W.F. et al. Characterization of a collection of deletion mutants at the 3′-end of 16S ribosomal RNA of Escherichia coli . Molec Gen Genet 203, 256–264 (1986). https://doi.org/10.1007/BF00333963
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DOI: https://doi.org/10.1007/BF00333963