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Nucleotide sequence of a 23S and a 5S-like rRNA gene from the thermophilic Bacillus sp. strain PS3.

In most eubacteria, rRNAs are organized in operons consisting of the 16S rRNA followed by the 23S and then the 5S rRNA (1). Within a cluster of structural RNA genes carried on a 4.0 kb EcoRI fragment of DNA from the thermophilic Bacillus sp. strain PS3, a 23S rRNA and a 122 bp DNA sequence resembling a 5S rRNA were identified. The DNA sequence of 23S rRNA from Bacillus sp. strain PS3 was 2,914 bp in length and was >97% identical with the corresponding DNA from B.stearothermophilus (2), indicating that the two bacteria are probably very closely related. Just downstream of the 23S rRNA, where the 5S rRNA should be, lay the 122 bp sequence. The nucleotide sequence of the 5S-like rRNA was not very similar to either the major or minor form of 5S rRNA isolated from B. stearothermophilus (3), nor did it resemble the scRNA described in B.stearothermophilus (4). Despite the fact that the nucleotide sequence of the 5S-like rRNA had only about 51 % identity with that of the 5S rRNA, the predicted secondary structures of the two molecules were strikingly similar. The two structures are compared in Figure 1; panel A shows the 5S-like rRNA, and panel B shows the 5S rRNA of B.stearothermophilus (5). The underlined nucleotide sequence, 'GAAC,' is highly conserved in eubacterial 5S rRNA (6). It lies in the so-called 'C' loop of the 5S rRNA 42 to 47 nucleotides from