Figure 1.

(a) Portiera chromosome map generated with Circos v. 0.56 [23]. From outside to inside, tracks depict: protein genes on (i) forward and (ii) reverse strands, (iii) RNA genes with rRNAs in red and tRNAs in black, (iv) GC content, and (v) GC skew. Protein-coding sequences are coloured by COG category. The orange line outside the circle notes the position of the three carotenoid biosynthesis genes. (b) Structural organization of carotenoid biosynthesis genes (red) and functionally unrelated flanking genes (grey) in Portiera and comparison with top BLAST hit, Vibrio caribbenthicus.