Nucleic Acids Research, Vol 25, Issue 17 3471-3477, Copyright © 1997 by Oxford University Press
A Vioque
The RNase P RNA gene (rnpB) from 10 cyanobacteria has been characterized.
These new RNAs, together with the previously available ones, provide a
comprehensive data set of RNase P RNA from diverse cyanobacterial lineages.
All heterocystous cyanobacteria, but none of the non-heterocystous strains
analyzed, contain short tandemly repeated repetitive (STRR) sequences that
increase the length of helix P12. Site- directed mutagenesis experiments
indicate that the STRR sequences are not required for catalytic activity in
vitro. STRR sequences seem to have recently and independently invaded the
RNase P RNA genes in heterocyst-forming cyanobacteria because closely
related strains contain unrelated STRR sequences. Most cyanobacteria RNase
P RNAs lack the sequence GGU in the loop connecting helices P15 and P16
that has been established to interact with the 3'-end CCA in precursor tRNA
substrates in other bacteria. This character is shared with plastid RNase P
RNA. Helix P6 is longer than usual in most cyanobacteria as well as in
plastid RNase P RNA.
ARTICLES
The RNase P RNA from cyanobacteria: short tandemly repeated repetitive (STRR) sequences are present within the RNase P RNA gene in heterocyst- forming cyanobacteria
Instituto de Bioquimica Vegetal y Fotosintesis, Centro de Investigaciones Isla de la Cartuja, Universidad de Sevilla-CSIC, Avenida Americo Vespucio s/n, 41092 Sevilla, Spain. vioque@cica.es
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