Structural basis for the distinct core-antenna assembly of cryptophyte photosystem II

Long Si, Shumeng Zhang, Xiaodong Su and Mei Li ()
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Long Si: CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences
Shumeng Zhang: CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences
Xiaodong Su: CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences
Mei Li: CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-15

Abstract: Abstract Photosystem II (PSII) catalyzes the light-driven charge separation and water oxidation reactions of photosynthesis. Eukaryotic PSII core is usually associated with membrane-embedded light-harvesting antennae, which greatly increase the absorbance cross-section of the core. The peripheral antennae in different phototrophs vary considerably in protein composition and arrangement. Photosynthetic cryptophytes possess chlorophyll a/c binding proteins (CACs) that serve as their antennae. How these CACs assemble with the PSII core remains unclear. Here, we report the 2.57-Å resolution structure of cryptophyte PSII-CAC purified from cells at nitrogen-limited stationary growth phase. We show that each monomer of the PSII homodimer contains a core complex, six chlorophyll a/c binding proteins (CACs) and a previously unseen chlorophyll-binding protein (termed CAL-II). Six CACs are arranged as a double-layered arc-shaped non-parallel belt, and two such belts attach to the dimeric core from opposite sides. The CAL-II simultaneously interacts with a number of core subunits and five CACs. The distinct organization of CACs and the presence of CAL-II may play a critical role in stabilizing the dimeric PSII-CAC complex under stress conditions. Our study provides mechanistic insights into the assembly and function of the PSII-CAC complex as well as the possible adaptation of cryptophytes in response to environmental stresses.

Date: 2024
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DOI: 10.1038/s41467-024-51206-y

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