Ecies (32). Such enzymes could provide another means for Chl d biosynthesis. A. marina codes for 12 proteins with putative radical SAM motifs, far more than expected from an oxygen-producing cyanobacterium. Of these 12, two (AM1 5023 and AM1 5798) share very little homology with other sequenced cyanobacteria. The Chl d biosynthesis pathway may not be as simple as expected. Unlike the formyl side c
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
Cyanobacteria and higher plantscontain -carotene as a primary carotenoid found in both PSI and PSII (Fig. 3). In the case of A. marina, -carotene was detected instead of -carotene, and zeaxanthin, an oxidative product of -carotene, was identified as a major carotenoid (4, 13). A similar carotenoid composition has been reported only in Prochlorococcus species that contain atypical, divinyl-Chls, an
G chlorophyll.Fig. 3. A schematic of the putative carotenoid biosynthesis pathway in Acaryochloris. The reaction catalyzed by CrtR passes through the intermediate -cryptoxanthin.which likely provided the origin for CAO, and other poorly understood enzymes, such as the phylogenetically aberrant divinyl chlorophyllide reductase (33), which shows an unusual phylogenetic topology in A. marina (AM1 239
He global population of Acaryochloris species has a range of lifestyles from free-living to symbiotic and marine to terrestrial. We report here the complete genome sequence of A. marina str. MBIC11017, the first A. marina strain isolated from the Prochloron-dominated colonial ascidian Lissoclinum patella off the tropical coast of the Palau islands (3, 5). This represents a previously uncharacteriz
Itrogen cycles in each of these environments where they modify their morphology, metabolism, and light-harvesting systems for survival in their respective niches. To date, genomes of 55 cyanobacterial strains in 21 genera have been completed or are under construction (National Center for Biotechnology Information). These cyanobacterial genomes are diverse in size, ranging from 1.66 to 9.1 Mbp. The
Cystis and Nostoc at 8.4 (28.1 ) and 9.8 (36.1 ), respectively. Another possible influence on the expansion is the presence of duplicate copies of recA, an important multifunctional DNA repair and recombination enzyme found in nearly every organism (reviewed in ref. 22). There are an astounding seven distinct copies of this gene (recA) found in the A. marina genome, far greater than the previous
Cystis and Nostoc at 8.4 (28.1 ) and 9.8 (36.1 ), respectively. Another possible influence on the expansion is the presence of duplicate copies of recA, an important multifunctional DNA repair and recombination enzyme found in nearly every organism (reviewed in ref. 22). There are an astounding seven distinct copies of this gene (recA) found in the A. marina genome, far greater than the previous