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. 1991 Oct 15;88(20):9193–9197. doi: 10.1073/pnas.88.20.9193

Site-specific cleavage by metal ion cofactors and inhibitors of M1 RNA, the catalytic subunit of RNase P from Escherichia coli.

S Kazakov 1, S Altman 1
PMCID: PMC52679  PMID: 1718000

Abstract

The location of phosphate residues involved in specific centers for binding of metal ions in M1 RNA, the catalytic RNA subunit of RNase P from Escherichia coli, was determined by analysis of induction of cleavage of RNA by metal ions. At pH 9.5, Mg2+ catalyzes cleavage of M1 RNA at five principal sites. Under certain conditions, Mn2+ and Ca2+ can each replace Mg2+ as the cofactor in the processing of precursor tRNAs by M1 RNA and P RNA, the RNA subunit of RNase P from Bacillus subtilis. These cations, as well as various metal ion inhibitors of the catalytic activity of M1 RNA, also promote cleavage of M1 RNA in a specific manner. Certain conditions that affect the catalytic activity of M1 RNA also alter the rate of metal ion-induced cleavage at the various sites. From these results and a comparison of cleavage of M1 RNA with that of a deletion mutant of M1 RNA and of P RNA, we have identified two different centers for binding of metal ions in M1 RNA that are important for the processing of the precursor to tRNA(Tyr) from E. coli. There is also a center for the binding of metal ions in the substrate, close to the site of cleavage by M1 RNA.

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Selected References

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