Genome-wide search for yeast RNase P substrates reveals role in maturation of intron-encoded box C/D small nucleolar RNAs.

Proceedings of the National Academy of Sciences of the United States of America
Daniel J CoughlinDavid R Engelke

Abstract

Ribonuclease P (RNase P) is an essential endonuclease responsible for the 5'-end maturation of precursor tRNAs. Bacterial RNase P also processes precursor 4.5S RNA, tmRNA, 30S preribosomal RNA, and several reported protein-coding RNAs. Eukaryotic nuclear RNase P is far more complex than in the bacterial form, employing multiple essential protein subunits in addition to the catalytic RNA subunit. RNomic studies have shown that RNase P binds other RNAs in addition to tRNAs, but no non-tRNA substrates have previously been identified. Additional substrates were identified by using a multipronged approach in the budding yeast Saccharomyces cerevisiae. First, RNase P-dependant changes in RNA abundance were examined on whole-genome microarrays by using strains containing temperature sensitive (TS) mutations in two of the essential RNase P subunits, Pop1p and Rpr1r. Second, RNase P was rapidly affinity-purified, and copurified RNAs were identified by using a genome-wide microarray. Third, to identify RNAs that do not change abundance when RNase P is depleted but accumulate as larger precursors, >80 potential small RNA substrates were probed directly by Northern blot analysis with RNA from the RNase P TS mutants. Numerous potential subs...Continue Reading

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