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. 1984 Jan;81(1):185–188. doi: 10.1073/pnas.81.1.185

RNase III cleavage is obligate for maturation but not for function of Escherichia coli pre-23S rRNA.

T C King, R Sirdeshmukh, D Schlessinger
PMCID: PMC344635  PMID: 6364133

Abstract

RNase III makes the initial cleavages that excise Escherichia coli precursor 16S and 23S rRNA from a single large primary transcript. In mutants deficient in RNase III, no species cleaved by RNase III are detected and the processing of 23S rRNA precursors to form mature 23S rRNA fails entirely. Instead, 50S ribosomes are formed with rRNAs up to several hundred nucleotides longer than mature 23S rRNA. Unexpectedly, these aberrant subunits function well enough to participate in protein synthesis and permit cell growth. Consistent with the inference that RNase III cleavages are absolutely required for 23S rRNA maturation, when 50S ribosomes from a strain deficient in RNase III were incubated with a ribosome-free extract from a RNase III+ strain, rRNA species processed by RNase III and species with normal mature 23S rRNA termini were produced.

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Selected References

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