Figure 5

Spheroid body orf sbl 0010 encodes a fusion protein derived from homologues of the Cyanothece sp. ATCC51142 Cyl0018 and Cyl0020 proteins. A. Alignment of predicted amino acid sequences for spheroid body protein Sbl0010 and Cyanothece proteins Cyl0018 and Cyl0020. Deletion in the endosymbiont genome of cyl 0019 in the creation of sbl 0010 can be inferred during reductive genome evolution. In Sb10010, homologues of Cyl0018 and Cyl0020 have been conserved in full length and are separated by a 17 amino acid residues. Cyl0018: green, Cyl0020: orange, Sbl0010: black. B. Cyl0018 and Cyl0020 are highly conserved in cyanobacteria closely related to the spheroid body. They are aseparated by 1–5 genes when they co-occur at the same locus, but in some cases they are encoded at different loci of the genome (indicated by x).