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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
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Tegory (rings 1 and 2), deviation from average GC content (ring 3), and GC skew (ring 4). All plasmids are represented at 10 scale for visualization except pREB9 at 500. Color codes are as follows: turquoise, small-molecule biosynthesis; yellow, central or intermediary metabolism; orange, energy metabolism; red, signal transduction; light blue, DNA metabolism; blue, transcription; purple, protein
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The stable oligotrophic open ocean (1). In contrast, the 7.21-Mbp genomewww.pnas.org cgi doi 10.1073 pnas.Tof Nostoc sp. PCC7120 (also known as Anabaena) is characteristic of the genetic adaptability of filamentous cyanobacteria that thrive under both free-living and symbiotic conditions where they fix nitrogen; form a number of distinct cell morphologies; and grow photoautotrophically, photoheter
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Ed in Na -transport. However, it is clear that this class of ATP synthase does not share any greater degree of similarity to Na -transport systems in Ilyobacter tartaricus and others (27) than to other ATP synthases. The primary sequences of these proteins are so divergent from other ATP synthases that a thorough biochemical study is needed to confidently propose a functional role.Chlorophyll Bios
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Ed in Na -transport. However, it is clear that this class of ATP synthase does not share any greater degree of similarity to Na -transport systems in Ilyobacter tartaricus and others (27) than to other ATP synthases. The primary sequences of these proteins are so divergent from other ATP synthases that a thorough biochemical study is needed to confidently propose a functional role.Chlorophyll Bios
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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
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Possible that the means of Chl d synthesis could be completely unrelated to anything familiar in chlorophyll chemistry, it is far more likely that an enzyme has been recruited from related pathways. Major sources of interest are the large pool of proteins orthologous to ``Chl degradation'' and aromatic ring breakage,PNAS February 12, 2008 vol. 105 no. 6GENETICSFig. 2. Phylogenetic relationship of
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Ed in Na -transport. However, it is clear that this class of ATP synthase does not share any greater degree of similarity to Na -transport systems in Ilyobacter tartaricus and others (27) than to other ATP synthases. The primary sequences of these proteins are so divergent from other ATP synthases that a thorough biochemical study is needed to confidently propose a functional role.Chlorophyll Bios