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Phototrophic Gemmatimonadetes gained the ability to use solar energy by acquiring photosynthesis-related genes from an ancient phototrophic proteobacterium through horizontal gene transfer.
Electron cryo-microscopy revealed a unique double-ring structure of the photosystem, consisting of a central reaction center surrounded by two distinct antenna rings for enhanced light absorption.
The study demonstrated that Gemmatimonadetes has evolved an efficient architecture for solar energy harvesting, featuring complex energy flow from the outer antennae to the reaction center.
Article Abstract
Phototrophic Gemmatimonadetes evolved the ability to use solar energy following horizontal transfer of photosynthesis-related genes from an ancient phototrophic proteobacterium. The electron cryo-microscopy structure of the photosystem at 2.4 Å reveals a unique, double-ring complex. Two unique membrane-extrinsic polypeptides, RC-S and RC-U, hold the central type 2 reaction center (RC) within an inner 16-subunit light-harvesting 1 (LH1) ring, which is encircled by an outer 24-subunit antenna ring (LHh) that adds light-gathering capacity. Femtosecond kinetics reveal the flow of energy within the RC-dLH complex, from the outer LHh ring to LH1 and then to the RC. This structural and functional study shows that has independently evolved its own compact, robust, and highly effective architecture for harvesting and trapping solar energy.
