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. 2000 Dec;6(12):1895–1904. doi: 10.1017/s1355838200001461

Phylogenetic-comparative analysis of the eukaryal ribonuclease P RNA.

D N Frank 1, C Adamidi 1, M A Ehringer 1, C Pitulle 1, N R Pace 1
PMCID: PMC1370057  PMID: 11142387

Abstract

Ribonuclease P (RNase P) is the ribonucleoprotein enzyme that cleaves 5'-leader sequences from precursor-tRNAs. Bacterial and eukaryal RNase P RNAs differ fundamentally in that the former, but not the latter, are capable of catalyzing pre-tRNA maturation in vitro in the absence of proteins. An explanation of these functional differences will be assisted by a detailed comparison of bacterial and eukaryal RNase P RNA structures. However, the structures of eukaryal RNase P RNAs remain poorly characterized, compared to their bacterial and archaeal homologs. Hence, we have taken a phylogenetic-comparative approach to refine the secondary structures of eukaryal RNase P RNAs. To this end, 20 new RNase P RNA sequences have been determined from species of ascomycetous fungi representative of the genera Arxiozyma, Clavispora, Kluyveromyces, Pichia, Saccharomyces, Saccharomycopsis, Torulaspora, Wickerhamia, and Zygosaccharomyces. Phylogenetic-comparative analysis of these and other sequences refines previous eukaryal RNase P RNA secondary structure models. Patterns of sequence conservation and length variation refine the minimum-consensus model of the core eukaryal RNA structure. In comparison to bacterial RNase P RNAs, the eukaryal homologs lack RNA structural elements thought to be critical for both substrate binding and catalysis. Nonetheless, the eukaryal RNA retains the main features of the catalytic core of the bacterial RNase P. This indicates that the eukaryal RNA remains intrinsically a ribozyme.

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Selected References

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