title: Genomic structure of an economically important cyanobacterium, Arthrospira (Spirulina) platensis NIES-39.
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.
authors.affiliation: Bioresource Information Center, Department of Biotechnology, National Institute of Technology and Evaluation, 2-10-49 Nishihara, Shibuya-ku, Tokyo 151-0066, Japan.
authors.forename: Takatomo
authors.initials: T
authors.lastname: Fujisawa
authors.forename: Rei
authors.initials: R
authors.lastname: Narikawa
authors.forename: Shinobu
authors.initials: S
authors.lastname: Okamoto
authors.forename: Shigeki
authors.initials: S
authors.lastname: Ehira
authors.forename: Hidehisa
authors.initials: H
authors.lastname: Yoshimura
authors.forename: Iwane
authors.initials: I
authors.lastname: Suzuki
authors.forename: Tatsuru
authors.initials: T
authors.lastname: Masuda
authors.forename: Mari
authors.initials: M
authors.lastname: Mochimaru
authors.forename: Shinichi
authors.initials: S
authors.lastname: Takaichi
authors.forename: Koichiro
authors.initials: K
authors.lastname: Awai
authors.forename: Mitsuo
authors.initials: M
authors.lastname: Sekine
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Horikawa
authors.forename: Isao
authors.initials: I
authors.lastname: Yashiro
authors.forename: Seiha
authors.initials: S
authors.lastname: Omata
authors.forename: Hiromi
authors.initials: H
authors.lastname: Takarada
authors.forename: Yoko
authors.initials: Y
authors.lastname: Katano
authors.forename: Hiroki
authors.initials: H
authors.lastname: Kosugi
authors.forename: Satoshi
authors.initials: S
authors.lastname: Tanikawa
authors.forename: Kazuko
authors.initials: K
authors.lastname: Ohmori
authors.forename: Naoki
authors.initials: N
authors.lastname: Sato
authors.forename: Masahiko
authors.initials: M
authors.lastname: Ikeuchi
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Fujita
authors.forename: Masayuki
authors.initials: M
authors.lastname: Ohmori
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics; D002874:Chromosome Mapping; D005798:Genes, Bacterial; D016680:Genome, Bacterial; D012329:RNA, Bacterial / Q000235:genetics; D012343:RNA, Transfer / Q000235:genetics; D053545:Spirulina / Q000235:genetics*
chemical_list: D001426:Bacterial Proteins; D012329:RNA, Bacterial; D012343:RNA, Transfer