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TitleCore and rod structures of a thermophilic cyanobacterial light-harvesting phycobilisome.
Journal, issue, pagesNat Commun, Vol. 13, Issue 1, Page 3389, Year 2022
Publish dateJun 17, 2022
AuthorsKeisuke Kawakami / Tasuku Hamaguchi / Yuu Hirose / Daisuke Kosumi / Makoto Miyata / Nobuo Kamiya / Koji Yonekura /
PubMed AbstractCyanobacteria, glaucophytes, and rhodophytes utilize giant, light-harvesting phycobilisomes (PBSs) for capturing solar energy and conveying it to photosynthetic reaction centers. PBSs are ...Cyanobacteria, glaucophytes, and rhodophytes utilize giant, light-harvesting phycobilisomes (PBSs) for capturing solar energy and conveying it to photosynthetic reaction centers. PBSs are compositionally and structurally diverse, and exceedingly complex, all of which pose a challenge for a comprehensive understanding of their function. To date, three detailed architectures of PBSs by cryo-electron microscopy (cryo-EM) have been described: a hemiellipsoidal type, a block-type from rhodophytes, and a cyanobacterial hemidiscoidal-type. Here, we report cryo-EM structures of a pentacylindrical allophycocyanin core and phycocyanin-containing rod of a thermophilic cyanobacterial hemidiscoidal PBS. The structures define the spatial arrangement of protein subunits and chromophores, crucial for deciphering the energy transfer mechanism. They reveal how the pentacylindrical core is formed, identify key interactions between linker proteins and the bilin chromophores, and indicate pathways for unidirectional energy transfer.
External linksNat Commun / PubMed:35715389 / PubMed Central
MethodsEM (single particle)
Resolution3.7 - 4.2 Å
Structure data

31944

7vea

EMDB-31944, PDB-7vea:
Pentacylindrical allophycocyanin core from Thermosynechococcus vulcanus
Method: EM (single particle) / Resolution: 3.7 Å

31945

7veb

EMDB-31945, PDB-7veb:
Phycocyanin rod structure of cyanobacterial phycobilisome
Method: EM (single particle) / Resolution: 4.2 Å

Chemicals

ChemComp-CYC:
PHYCOCYANOBILIN / Phycocyanobilin

Source
  • Thermosynechococcus vulcanus NIES-2134 (bacteria)
  • thermosynechococcus vestitus bp-1 (bacteria)
  • thermosynechococcus elongatus bp-1 (bacteria)
KeywordsPHOTOSYNTHESIS / Light-harvesting complex / Phycobilisome / Energy transfer / Phycocyanin rod / Light-harvesting

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