Structure of a photosystem II-FCPII supercomplex from a haptophyte reveals a distinct antenna organization

作者：Romain La Rocca, Koji Kato, Pi-Cheng Tsai, Yoshiki Nakajima, F. Akita, Jian‐Ren Shen · 发表于：Nature Communications · 年份：2025 · DOI：10.1038/s41467-025-59512-9 · 被引用次数：15 · 研究领域：Photosynthetic Processes and Mechanisms、Paleontology and Stratigraphy of Fossils、Methane Hydrates and Related Phenomena

production, their energy conversion system is still poorly known. Here we report a cryo-electron microscopic structure of photosystem II (PSII)-fucoxanthin chlorophyll c-binding protein (FCPII) supercomplex from Chyrostila roscoffensis, a representative of coccolithophores. This complex has two sets of six dimeric and monomeric FCPIIs, with distinct orientations. Interfaces of both FCPII/FCPII and FCPII/core differ from previously reported. We also determine the sequence of Psb36, a subunit previously found in diatoms and red algae. The principal excitation energy transfer (EET) pathways involve mainly 5 FCPIIs, where one FCPII monomer mediates EET to CP47. Our findings provide a solid structural basis for EET and energy dissipation pathways occurring in coccolithophores.