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. 1990 May;10(5):2191–2201. doi: 10.1128/mcb.10.5.2191

Efficient site-specific cleavage by RNase MRP requires interaction with two evolutionarily conserved mitochondrial RNA sequences.

J L Bennett 1, D A Clayton 1
PMCID: PMC360567  PMID: 2325651

Abstract

RNase MRP is a site-specific endonuclease that processes primer mitochondrial RNA from the leading-strand origin of mitochondrial DNA replication. Using deletional analysis and saturation mutagenesis, we have determined the substrate requirements for cleavage by mouse mitochondrial RNase MRP. Two regions of sequence homology among vertebrate mitochondrial RNA primers, conserved sequence blocks II and III, were found to be critical for both efficient and accurate cleavage; a third region of sequence homology, conserved sequence block I, was dispensable. Analysis of insertion and deletion mutations within conserved sequence block II demonstrated that the specificity of RNase MRP accommodates the natural sequence heterogeneity of conserved sequence block II in vivo. Heterologous assays with human RNase MRP and mutated mouse mitochondrial RNA substrates indicated that sequences essential for substrate recognition are conserved between mammalian species.

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