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. 1993 Dec 25;21(25):5916–5920. doi: 10.1093/nar/21.25.5916

Lead-catalyzed cleavage of ribonuclease P RNA as a probe for integrity of tertiary structure.

K Zito 1, A Hüttenhofer 1, N R Pace 1
PMCID: PMC310474  PMID: 7507234

Abstract

Pb(2+)-catalyzed cleavage of RNA has been shown previously to be a useful probe for tertiary structure. In the present study, Pb2+ cleavage patterns were identified for ribonuclease P RNAs from three phylogenetically disparate organisms, Escherichia coli, Chromatium vinosum, Bacillus subtilis, and for E. coli RNase P RNAs that had been altered by deletions. Each of the native RNAs undergoes cleavage at several sites in the core structure that is common to all bacterial RNase P RNAs. All the cleavages occur in non-paired regions of the secondary structure models of the RNAs, in regions likely to be involved in tertiary interactions. Two cleavage sites occur at homologous positions in all the native RNAs, regardless of sequence variation, suggesting common tertiary structural features. The Pb2+ cleavage sites in four deletion mutants of E. coli RNase P RNA differed from the native pattern, indicating alterations in the tertiary structures of the mutant RNAs. This conclusion is consistent with previously characterized properties of the mutant RNAs. The Pb2+ cleavage assay is thus a useful probe to reveal alteration of tertiary structure in RNase P RNA.

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Selected References

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