photosystem I reaction center / phycobilisome / photosystem I / photosynthetic electron transport in photosystem I / photosystem I / plasma membrane-derived thylakoid membrane / chlorophyll binding / photosynthesis / 4 iron, 4 sulfur cluster binding / electron transfer activity ...photosystem I reaction center / phycobilisome / photosystem I / photosynthetic electron transport in photosystem I / photosystem I / plasma membrane-derived thylakoid membrane / chlorophyll binding / photosynthesis / 4 iron, 4 sulfur cluster binding / electron transfer activity / oxidoreductase activity / magnesium ion binding / metal ion binding 類似検索 - 分子機能
Photosystem I PsaX / Photosystem I PsaX superfamily / PsaX family / Phycobilisome linker protein / Phycobilisome linker domain / Phycobilisome linker domain superfamily / Phycobilisome Linker polypeptide / Phycobilisome (PBS) linker domain profile. / Photosystem I reaction center subunit PsaK / Photosystem I reaction centre subunit PsaK ...Photosystem I PsaX / Photosystem I PsaX superfamily / PsaX family / Phycobilisome linker protein / Phycobilisome linker domain / Phycobilisome linker domain superfamily / Phycobilisome Linker polypeptide / Phycobilisome (PBS) linker domain profile. / Photosystem I reaction center subunit PsaK / Photosystem I reaction centre subunit PsaK / Photosystem I reaction centre subunit PsaK superfamily / Photosystem I PsaM, reaction centre superfamily / Photosystem I PsaM, reaction centre / Photosystem I protein M (PsaM) / Photosystem I reaction center subunit V/PsaK / Photosystem I psaG / psaK / Photosystem I PsaL, reaction centre subunit XI / Photosystem I, reaction centre subunit XI / Photosystem I PsaL, reaction centre subunit XI superfamily / Photosystem I reaction centre subunit XI / Photosystem I reaction centre subunit VIII / Photosystem I reaction centre subunit VIII / Photosystem I reaction centre subunit VIII superfamily / Photosystem I PsaF, reaction centre subunit III / Photosystem I PsaF, reaction centre subunit III superfamily / Photosystem I reaction centre subunit III / Photosystem I PsaD / Photosystem I, reaction centre subunit PsaD superfamily / PsaD / Photosystem I PsaE, reaction centre subunit IV / Photosystem I reaction centre subunit IV / PsaE / Photosystem I PsaJ, reaction centre subunit IX superfamily / Photosystem I PsaJ, reaction centre subunit IX / Photosystem I reaction centre subunit IX / PsaJ / Photosystem I PsaA / Photosystem I protein PsaC / Photosystem I PsaB / Photosystem I PsaA/PsaB, conserved site / Photosystem I psaA and psaB proteins signature. / : / Photosystem I PsaA/PsaB / Photosystem I PsaA/PsaB superfamily / Photosystem I psaA/psaB protein / Electron transport accessory-like domain superfamily / 4Fe-4S dicluster domain / 4Fe-4S ferredoxin, iron-sulphur binding, conserved site / 4Fe-4S ferredoxin-type iron-sulfur binding region signature. / 4Fe-4S ferredoxin-type iron-sulfur binding domain profile. / 4Fe-4S ferredoxin-type, iron-sulphur binding domain 類似検索 - ドメイン・相同性
Photosystem I iron-sulfur center / Photosystem I-associated linker protein CpcL / Photosystem I reaction center subunit VIII / Photosystem I reaction center subunit III / Photosystem I P700 chlorophyll a apoprotein A2 1 / Photosystem I 4.8 kDa protein / Photosystem I reaction center subunit IX / Photosystem I reaction center subunit II / Photosystem I reaction center subunit IV / Photosystem I P700 chlorophyll a apoprotein A1 ...Photosystem I iron-sulfur center / Photosystem I-associated linker protein CpcL / Photosystem I reaction center subunit VIII / Photosystem I reaction center subunit III / Photosystem I P700 chlorophyll a apoprotein A2 1 / Photosystem I 4.8 kDa protein / Photosystem I reaction center subunit IX / Photosystem I reaction center subunit II / Photosystem I reaction center subunit IV / Photosystem I P700 chlorophyll a apoprotein A1 / Photosystem I reaction center subunit XI / Photosystem I reaction center subunit PsaK 1 / Photosystem I reaction center subunit XII 類似検索 - 構成要素
National Natural Science Foundation of China (NSFC)
中国
引用
ジャーナル: Proc Natl Acad Sci U S A / 年: 2026 タイトル: Structural insight of a photosystem I-CpcL-phycobilisome supercomplex from a cyanobacterium sp. PCC 7120. 著者: Zhiyuan Mao / Zhenhua Li / Xingyue Li / Liangliang Shen / Tingyun Kuang / Wenda Wang / Jian-Ren Shen / Guangye Han / 要旨: Phycobilisomes (PBSs) are supramolecular pigment-protein complexes composed of phycobiliproteins and linker proteins, serving as the major light-harvesting complexes that capture and transfer light ...Phycobilisomes (PBSs) are supramolecular pigment-protein complexes composed of phycobiliproteins and linker proteins, serving as the major light-harvesting complexes that capture and transfer light energy to photosystem II (PSII) and photosystem I (PSI) in cyanobacteria and eukaryotic red algae. In cyanobacteria, a rod-type PBS that does not have a core is specifically connected to PSI by a linker protein CpcL to form a PSI-CpcL-PBS supercomplex. However, the mechanism of CpcL-PBS association to PSI remains unclear. Here, we report the cryoelectron microscopic structures of PSI-CpcL-PBS at 2.98 Å and CpcL-PBS at 2.93 Å resolution from a cyanobacterium sp. PCC 7120, respectively. CpcL-PBS is located on the stromal side of a PSI tetramer and exhibits a structure of three-layered PBS consisting of four linkers (CpcL, CpcC1, CpcC2, PecC) and 18 pairs of phycocyanin αβ monomers. The C-terminal transmembrane helix of CpcL inserts to the membrane and interacts with PsaA, PsaB, and PsaM of PSI at an interface I between two PSI monomers, enabling the formation of the PSI-CpcL-PBS supercomplex. The exact structure of protein subunits and arrangement of bilin and chlorophyll pigments are revealed, which provide a structural basis for the assembly of PSI-CpcL-PBS and possible excitation energy transfer pathways from antennas to PSI within this supercomplex, shedding light on the organization and attachment of CpcL-PBS in cyanobacterial thylakoids.