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TitleStructural insight of a photosystem I-CpcL-phycobilisome supercomplex from a cyanobacterium sp. PCC 7120.
Journal, issue, pagesProc Natl Acad Sci U S A, Vol. 123, Issue 13, Page e2530459123, Year 2026
Publish dateMar 31, 2026
AuthorsZhiyuan Mao / Zhenhua Li / Xingyue Li / Liangliang Shen / Tingyun Kuang / Wenda Wang / Jian-Ren Shen / Guangye Han /
PubMed AbstractPhycobilisomes (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.
External linksProc Natl Acad Sci U S A / PubMed:41880560 / PubMed Central
MethodsEM (single particle)
Resolution2.58 - 2.98 Å
Structure data

65635

9w4j

EMDB-65635, PDB-9w4j:
Cryo-EM structure of CpcL-PBS3
Method: EM (single particle) / Resolution: 2.93 Å

65729

9w7k

EMDB-65729, PDB-9w7k:
Cryo-EM structure of CpcL-PBS2
Method: EM (single particle) / Resolution: 2.58 Å

65883

9wd5

EMDB-65883, PDB-9wd5:
Cryo-EM structure of PSI-CpcL
Method: EM (single particle) / Resolution: 2.98 Å

Chemicals

ChemComp-CYC:
PHYCOCYANOBILIN

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-PQN:
PHYLLOQUINONE

ChemComp-SF4:
IRON/SULFUR CLUSTER

ChemComp-BCR:
BETA-CAROTENE

ChemComp-LHG:
1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE / phospholipid*YM

ChemComp-CL0:
CHLOROPHYLL A ISOMER

ChemComp-SQD:
1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL

ChemComp-LMG:
1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE

Source
  • nostoc sp. pcc 7120 = fachb-418 (bacteria)
KeywordsPHOTOSYNTHESIS / Phycobilisomes / Photosystem I

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