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Publication Abstract from PubMed

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 Gemmatimonas phototrophica photosystem at 2.4 A 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 G. phototrophica has independently evolved its own compact, robust, and highly effective architecture for harvesting and trapping solar energy.

2.4-A structure of the double-ring Gemmatimonas phototrophica photosystem.,Qian P, Gardiner AT, Simova I, Naydenova K, Croll TI, Jackson PJ, Nupur, Kloz M, Cubakova P, Kuzma M, Zeng Y, Castro-Hartmann P, van Knippenberg B, Goldie KN, Kaftan D, Hrouzek P, Hajek J, Agirre J, Siebert CA, Bina D, Sader K, Stahlberg H, Sobotka R, Russo CJ, Polivka T, Hunter CN, Koblizek M Sci Adv. 2022 Feb 18;8(7):eabk3139. doi: 10.1126/sciadv.abk3139. Epub 2022 Feb , 16. PMID:35171663^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.