Nucleic Acids Research, Vol 24, Issue 23 4775-4782, Copyright © 1996 by Oxford University Press
ES Haas, AB Banta, JK Harris, NR Pace and JW Brown
The sequences and structures of RNase P RNAs of some Gram-positive
bacteria, e.g. Bacillus subtilis, are very different than those of other
bacteria. In order to expand our understanding of the structure and
evolution of RNase P RNA in Gram-positive bacteria, gene sequences encoding
RNase P RNAs from 10 additional species from this evolutionary group have
been determined, doubling the number of sequences available for comparative
analysis. The enlarged data set allows refinement of the secondary
structure model of these unusual RNase P RNAs and the identification of
potential tertiary interactions between P10.1 and L12, and between L5.1 and
L15.1. The newly-obtained sequences suggest that RNase P RNA underwent an
abrupt, dramatic restructuring in the ancestry of the low-G+C Gram-positive
bacteria after the divergence of the branches leading to the 'Clostridia
and relatives' and the remaining low-G+C Gram-positive species. The unusual
structures of the RNase P RNAs of Mycoplasma hyopneumoniae and
M.floccularre are apparently derived from RNAs with Bacillus-like structure
rather than from intermediate, partially restructured ancestral RNAs. The
structure of the RNase P RNA from the photosynthetic Heliobacillus mobilis
supports the relationship of this specie with Bacillus and Staphylococcus
rather than the 'Clostridia and relatives' as suggested by the sequences of
their small-subunit ribosomal RNAs.
ARTICLES
Structure and evolution of ribonuclease P RNA in Gram-positive bacteria
Department of Microbiology, North Carolina State University, Raleigh 27695, USA.
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