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- Title
Complete genome structure of the thermophilic cyanobacterium Thermosynechococcus elongatus BP-1.
- Authors
Nakamura, Yasukazu; Kaneko, Takakazu; Sato, Shusei; Ikeuchi, Masahiko; Katoh, Hiroshi; Sasamoto, Shigemi; Watanabe, Akiko; Iriguchi, Mayumi; Kawashima, Kumiko; Kimura, Takaharu; Kishida, Yoshie; Kiyokawa, Chiaki; Kohara, Mitsuyo; Matsumoto, Midori; Matsuno, Ai; Nakazaki, Naomi; Shimpo, Sayaka; Sugimoto, Masako; Takeuchi, Chie; Yamada, Manabu; Tabata, Satoshi
- Abstract
The entire genome of a thermophilic unicellular cyanobacterium, Thermosynechococcus elongatus BP-1, was sequenced. The genome consisted of a circular chromosome 2,593,857 bp long, and no plasmid was detected. A total of 2475 potential protein-encoding genes, one set of rRNA genes, 42 tRNA genes representing 42 tRNA species and 4 genes for small structural RNAs were assigned to the chromosome by similarity search and computer prediction. The translated products of 56% of the potential protein-encoding genes showed sequence similarity to experimentally identified and predicted proteins of known function, and the products of 34% of these genes showed sequence similarity to the translated products of hypothetical genes. The remaining 10% lacked significant similarity to genes for predicted proteins in the public DNA databases. Sixty-three percent of the T. elongatus genes showed significant sequence similarity to those of both Synechocystis sp. PCC 6803 and Anabaena sp. PCC 7120, while 22% of the genes were unique to this species, indicating a high degree of divergence of the gene information among cyanobacterial strains. The lack of genes for typical fatty acid desaturases and the presence of more genes for heat-shock proteins in comparison with other mesophilic cyanobacteria may be genomic features of thermophilic strains. A remarkable feature of the genome is the presence of 28 copies of group II introns, 8 of which contained a presumptive gene for maturase/reverse transcriptase. A trace of genome rearrangement mediated by the group II introns was also observed.
- Publication
DNA research : an international journal for rapid publication of reports on genes and genomes, 2002, Vol 9, Issue 4, p123
- ISSN
1340-2838
- Publication type
Journal Article
- DOI
10.1093/dnares/9.4.123