Minimal genomes,maximal productivity: comparative genomics of the photosystem and light-harvesting complexes in the marine cyanobacterium, <Emphasis Type="Italic">Prochlorococcus</Emphasis> |
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Authors: | Claire S Ting Meghan E Ramsey Yvette L Wang Alana M Frost Esther Jun Timothy Durham |
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Institution: | (1) Thompson Biology Lab, Department of Biology, Williams College, Williamstown, MA 01267, USA |
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Abstract: | Although Prochlorococcus isolates possess the smallest genomes of any extant photosynthetic organism, this genus numerically dominates vast regions
of the world’s subtropical and tropical open oceans and has evolved to become an important contributor to global biogeochemical
cycles. The sequencing of 12 Prochlorococcus genomes provides a glimpse of the extensive genetic heterogeneity and, thus, physiological potential of the lineage. In this
study, we present an up-to-date comparative analysis of major proteins of the photosynthetic apparatus in 12 Prochlorococcus genomes. Our analyses reveal a striking diversity within the Prochlorococcus lineage in the major protein complexes of the photosynthetic apparatus. The heterogeneity that has evolved in the photosynthetic
apparatus suggests versatility in strategies for optimizing photosynthesis under conditions of environmental variability and
stress. This diversity could be particularly important in ensuring the survival of a lineage whose individuals have evolved
minimal genomes and, thus, relatively limited repertoires for responding to environmental challenges.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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Keywords: | Chlorophyll b-containing cyanobacteria Environmental stress Genomic diversity Global comparative genomics Oxychlorobacteria Pcb light-harvesting antenna |
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