Architecture of the photosynthetic complex from a green sulfur bacterium.

Science
Jing-Hua ChenXing Zhang

Abstract

The photosynthetic apparatus of green sulfur bacteria (GSB) contains a peripheral antenna chlorosome, light-harvesting Fenna-Matthews-Olson proteins (FMO), and a reaction center (GsbRC). We used cryo-electron microscopy to determine a 2.7-angstrom structure of the FMO-GsbRC supercomplex from Chlorobaculum tepidum The GsbRC binds considerably fewer (bacterio)chlorophylls [(B)Chls] than other known type I RCs do, and the organization of (B)Chls is similar to that in photosystem II. Two BChl layers in GsbRC are not connected by Chls, as seen in other RCs, but associate with two carotenoid derivatives. Relatively long distances of 22 to 33 angstroms were observed between BChls of FMO and GsbRC, consistent with the inefficient energy transfer between these entities. The structure contains common features of both type I and type II RCs and provides insight into the evolution of photosynthetic RCs.

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Citations

Feb 23, 2021·Biochimica Et Biophysica Acta. Bioenergetics·Thomas OliverTanai Cardona
Mar 12, 2021·Bioorganic & Medicinal Chemistry Letters·Mitsuaki HiroseHitoshi Tamiaki
Jun 27, 2021·Photosynthesis Research·Christopher J GisrielTanai Cardona
Aug 3, 2021·The Journal of Physical Chemistry Letters·Tomoki KandaHiroshi Ishikita
Mar 27, 2021·Plant & Cell Physiology·Michael Hippler, Nathan Nelson
Aug 18, 2021·The Biochemical Journal·Pu QianC Neil Hunter

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