1887

Abstract

PCR amplification of the internal transcribed spacer (ITS) between the 16S rRNA and 23S rRNA genes of the cyanobacterium PCC 7120 gave three products. Two represented true ITS regions of different sizes, while the third was a heteroduplex. The longer spacer (ITS-L) contained 512 nucleotides and carried tRNA and tRNA genes, separated by a large stem–loop structure (V2) composed of short tandemly repeated repetitive sequences. Both tRNA genes, and the 5′ half of the intervening stem, were absent from the shorter spacer (ITS-S), of length 283 nucleotides, which was otherwise almost completely identical to ITS-L. The two spacer regions of PCC 7120 were aligned to published ITS sequences of cyanobacteria, the cyanelle of and . Although the ITS regions of cyanobacteria vary in length from 283 to 545 nucleotides and contain either both tRNA and tRNA genes, only the tRNA gene, or neither, there is no correlation between ITS size and coding capacity for tRNAs. Putative secondary structures were determined for the deduced transcripts of the operons of several cyanobacteria and were compared to that of . Highly conserved motifs important for folding and for maturation of the rRNA transcripts were identified, and regions homologous to bacterial antiterminators (box B–box A) were located. The conserved and variable regions of the cyanobacterial ITS are potential targets of PCR primers and oligonucleotide probes for detection and identification of cyanobacteria at different taxonomic levels.

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2000-06-01
2020-07-06
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