Of the A. marina chromosome nucleotide sequence (vs. itself) shows 18.7 of the sequence (not including the original, duplicated sequence) has a homology of greater than E 1 10 10 to another location on the chromosome. This is significantly higher than the 11.2 and 5.8 duplication in Synechocystis PCC6803 and Nostoc sp. PCC7120, respectively. A. marina actually has far fewer duplicated regions t
Ith a lambda-phage cI motif are also likely correlated with the extra recA (22, 24). The presence of multiples copies of recA and related enzymes could account for gene duplication and/or integration of foreign genes that would lead to genome expansion. Based on the comparative analysis of many genomes, Konstantinidis et al. (21) hypothesized that species with large genomes may dominate noncompeti
Rently free to specialize their metabolic library.ATP Synthase. One interesting case of the idiosyncratic plasmidgene library in A. marina is the inclusion of a second full set of ATP synthase genes on plasmid pREB4 (AM1 D0157-67). These genes are arranged into a unique operon and the individual proteins do not clearly fit into any of the described families (SI Fig. 5) (25). This unusual operon is
Teins (PBPs), they do not form phycobilisomes (PBS), a typical structure for cyanobacterial peripheral antenna, but instead accumulate rod-shaped PBP complexes (6). Previous work has shown that chlorophylls in both reaction centers, photosystem (PS)I and PSII, have been replaced by Chl d, which absorbs light with a wavelength up to 30 nm red-shifted from Chl a (7, 8). Although it was anticipated t
Ed transposable regions for 20 of the genes, significantly lower than the 70 found in Nostoc sp. PCC7120 (2). This is partly because of the vast disparity in transposable elements in the two similarly sized genomes, with nearly 1,300 detected in Nostoc and only 500 in A. marina. Surprisingly, a large number of transposases and integrases in A. marina cluster together in regions with no detectabl
S far. This large array of genomic data is distributed into nine single-copy plasmids that code for >25 of the putative ORFs. Heavy duplication of genes related to DNA repair and recombination (primarily recA) and transposable elements could account for genetic mobility and genome expansion. We discuss points of interest for the biosynthesis of the unusual pigments chlorophyll d and -carotene and
Rently free to specialize their metabolic library.ATP Synthase. One interesting case of the idiosyncratic plasmidgene library in A. marina is the inclusion of a second full set of ATP synthase genes on plasmid pREB4 (AM1 D0157-67). These genes are arranged into a unique operon and the individual proteins do not clearly fit into any of the described families (SI Fig. 5) (25). This unusual operon is
S far. This large array of genomic data is distributed into nine single-copy plasmids that code for >25 of the putative ORFs. Heavy duplication of genes related to DNA repair and recombination (primarily recA) and transposable elements could account for genetic mobility and genome expansion. We discuss points of interest for the biosynthesis of the unusual pigments chlorophyll d and -carotene and