Structure of the Acidobacteria homodimeric reaction center bound with cytochrome c

Shishang Dong, Guoqiang Huang, Changhui Wang, Jiajia Wang, Sen-Fang Sui () and Xiaochun Qin ()
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Shishang Dong: University of Jinan
Guoqiang Huang: Tsinghua University
Changhui Wang: University of Jinan
Jiajia Wang: University of Jinan
Sen-Fang Sui: Tsinghua University
Xiaochun Qin: University of Jinan

Nature Communications, 2022, vol. 13, issue 1, 1-13

Abstract: Abstract Photosynthesis converts light energy to chemical energy to fuel life on earth. Light energy is harvested by antenna pigments and transferred to reaction centers (RCs) to drive the electron transfer (ET) reactions. Here, we present cryo-electron microscopy (cryo-EM) structures of two forms of the RC from the microaerophilic Chloracidobacterium thermophilum (CabRC): one containing 10 subunits, including two different cytochromes; and the other possessing two additional subunits, PscB and PscZ. The larger form contained 2 Zn-bacteriochlorophylls, 16 bacteriochlorophylls, 10 chlorophylls, 2 lycopenes, 2 hemes, 3 Fe4S4 clusters, 12 lipids, 2 Ca2+ ions and 6 water molecules, revealing a type I RC with an ET chain involving two hemes and a hybrid antenna containing bacteriochlorophylls and chlorophylls. Our results provide a structural basis for understanding the excitation energy and ET within the CabRC and offer evolutionary insights into the origin and adaptation of photosynthetic RCs.

Date: 2022
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DOI: 10.1038/s41467-022-35460-6

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