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. 1987 Dec;169(12):5523–5529. doi: 10.1128/jb.169.12.5523-5529.1987

Processing of Escherichia coli 16S rRNA with bacteriophage lambda leader sequences.

M Krych 1, R Sirdeshmukh 1, R Gourse 1, D Schlessinger 1
PMCID: PMC213981  PMID: 2445728

Abstract

To test whether any specific 5' precursor sequences are required for the processing of pre-16S rRNA, constructs were studied in which large parts of the 5' leader sequence were replaced by the coliphage lambda pL promoter and adjacent sequences. Unexpectedly, few full-length transcripts of the rRNA were detected after the pL promoter was induced, implying that either transcription was poor or most of the rRNA chains with lambda leader sequences were unstable. Nevertheless, sufficient transcription occurred to permit the detection of processing by S1 nuclease analysis. RNA transcripts in which 2/3 of the normal rRNA leader was deleted (from the promoter up to the normal RNase III cleavage site) were processed to form the normal 5' terminus. Thus, most of the double-stranded stem that forms from sequences bracketing wild-type 16S pre-rRNA is apparently not required for proper processing; the expression of such modified transcripts, however, must be increased before the efficiency of processing of the 16S rRNA formed can be assessed.

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Selected References

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