Structural insight of a photosystem I-CpcL-phycobilisome supercomplex from a cyanobacterium Anabaena sp. PCC 7120 - PubMed
3 hours ago
- #Cyanobacteria
- #Structural Biology
- #Photosynthesis
- Study examines structural insight of a photosystem I-CpcL-phycobilisome supercomplex from cyanobacterium Anabaena sp. PCC 7120.
- CpcL-PBS is a rod-type phycobilisome without a core, specifically attached to PSI via linker protein CpcL.
- Cryoelectron microscopy structures resolved at 2.98 Å for PSI-CpcL-PBS and 2.93 Å for CpcL-PBS.
- CpcL-PBS resides on the stromal side of a PSI tetramer, structured as three-layered PBS with four linkers and 18 phycocyanin αβ monomers.
- CpcL's C-terminal transmembrane helix inserts into the membrane, interacting with PSI proteins PsaA, PsaB, and PsaM at interface I.
- Structure reveals protein subunit arrangement and bilin/chlorophyll pigments, aiding assembly and energy transfer pathway understanding.
- Insights shed light on CpcL-PBS organization and attachment in cyanobacterial thylakoids.