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. 1983 Sep 24;11(18):6301–6318. doi: 10.1093/nar/11.18.6301

Structure and organization of rRNA operons in the region of the replication origin of the Bacillus subtilis chromosome.

N Ogasawara, S Moriya, H Yoshikawa
PMCID: PMC326374  PMID: 6312418

Abstract

Structure and organization of two complete ribosomal RNA (rRNA) gene sets, rrnO and rrnA, were determined for the first time in Bacillus subtilis. They are located at the region of the replication origin of the chromosome. Each set constitutes a single operon of: two tandem promoters - leader sequence - 16S rRNA gene - Ile-tRNA gene - Ala-tRNA gene - 23S rRNA gene - 5S rRNA gene - termination signal. The first promoter (P1) of rrnO differs from that of rrnA in sequence and function. P1 of rrnO was used very little for transcription either in vivo or in vitro while P1 was predominantly used in rrnA. A putative transcript of the entire operon was determined and constructed into a secondary structure. Analysis of in vivo transcripts by S1 mapping revealed primary processing sites at the loop and stem structure of 16S rRNA in rrnO and rrnA. A unique sequence in the leader region of rrnO can be formed into a highly complexed secondary structure and affects processing of mature 16S rRNA. The sequences of the two spacer tRNA genes are highly conserved between B. subtilis and Escherichia coli.

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Selected References

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