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J Biol Chem. 1991 Oct 15;266(29):19154-7.

Dramatic size variation of yeast mitochondrial RNAs suggests that RNase P RNAs can be quite small.

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  • 1Department of Biochemistry, University of Texas Southewestern Graduate School, Dallas 75235.

Abstract

The gene coding for the AU-rich RNA required for mitochondrial RNase P activity in Saccharomyces cerevisiae codes for a 490-base RNA while that in Candida glabrata codes for a 227-base RNA. We have detected a 140-nucleotide RNA coded by the mitochondrial DNA from Saccharomycopsis fibuligera by hybridization with an oligonucleotide complementary to a conserved sequence found in mitochondrial and prokaryotic RNase P RNAs. DNA sequence analysis of the mitochondrial DNA from the region coding for this RNA revealed a second conserved sequence block characteristic of RNase P RNA genes and the presence of a downstream tRNA(Pro) gene. Like previously characterized mitochondrial RNase P RNAs, this small RNA is extremely AU-rich. The discovery of this 140-base RNA suggests that naturally occurring RNase P RNAs may be quite small.

PMID:
1918032
[PubMed - indexed for MEDLINE]
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