Fujisawa T.,Narikawa R.,Okamoto S.,Ehira S.,Yoshimura H.,Suzuki I.,Masuda T.,Mochimaru M.,Takaichi S.,Awai K.,Sekine M.,Horikawa H.,Yashiro I.,Omata S.,Takarada H.,Katano Y.,Kosugi H.,Tanikawa S.,Ohmori K.,Sato N.,Ikeuchi M.,Fujita N.,Ohmori M.
DNA Res. 17 (2010) 85-103 [PMID: 20203057] Abstract
|
| Abstract: A filamentous non-N(2)-fixing cyanobacterium, Arthrospira (Spirulina) platensis, is an important organism for industrial applications and as a food supply. Almost the complete genome of A. platensis NIES-39 was determined in this study. The genome structure of A. platensis is estimated to be a single, circular chromosome of 6.8 Mb, based on optical mapping. Annotation of this 6.7 Mb sequence yielded 6630 protein-coding genes as well as two sets of rRNA genes and 40 tRNA genes. Of the protein-coding genes, 78% are similar to those of other organisms; the remaining 22% are currently unknown. A total 612 kb of the genome comprise group II introns, insertion sequences and some repetitive elements. Group I introns are located in a protein-coding region. Abundant restriction-modification systems were determined. Unique features in the gene composition were noted, particularly in a large number of genes for adenylate cyclase and haemolysin-like Ca(2+)-binding proteins and in chemotaxis proteins. Filament-specific genes were highlighted by comparative genomic analysis. |
