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Structure paper

TitleNon-conventional octameric structure of C-phycocyanin.
Journal, issue, pagesCommun Biol, Vol. 4, Issue 1, Page 1238, Year 2021
Publish dateOct 29, 2021
AuthorsTakuo Minato / Takamasa Teramoto / Naruhiko Adachi / Nguyen Khac Hung / Kaho Yamada / Masato Kawasaki / Masato Akutsu / Toshio Moriya / Toshiya Senda / Seiji Ogo / Yoshimitsu Kakuta / Ki-Seok Yoon /
PubMed AbstractC-phycocyanin (CPC), a blue pigment protein, is an indispensable component of giant phycobilisomes, which are light-harvesting antenna complexes in cyanobacteria that transfer energy efficiently to ...C-phycocyanin (CPC), a blue pigment protein, is an indispensable component of giant phycobilisomes, which are light-harvesting antenna complexes in cyanobacteria that transfer energy efficiently to photosystems I and II. X-ray crystallographic and electron microscopy (EM) analyses have revealed the structure of CPC to be a closed toroidal hexamer by assembling two trimers. In this study, the structural characterization of non-conventional octameric CPC is reported for the first time. Analyses of the crystal and cryogenic EM structures of the native CPC from filamentous thermophilic cyanobacterium Thermoleptolyngbya sp. O-77 unexpectedly illustrated the coexistence of conventional hexamer and novel octamer. In addition, an unusual dimeric state, observed via analytical ultracentrifugation, was postulated to be a key intermediate structure in the assemble of the previously unobserved octamer. These observations provide new insights into the assembly processes of CPCs and the mechanism of energy transfer in the light-harvesting complexes.
External linksCommun Biol / PubMed:34716405 / PubMed Central
MethodsEM (single particle) / X-ray diffraction
Resolution1.65 - 3.71 Å
Structure data

31089

7eh7

EMDB-31089, PDB-7eh7:
Cryo-EM structure of the octameric state of C-phycocyanin from Thermoleptolyngbya sp. O-77
Method: EM (single particle) / Resolution: 3.71 Å

31090

7eh8

EMDB-31090, PDB-7eh8:
Cryo-EM structure of the hexameric state of C-phycocyanin from Thermoleptolyngbya sp. O-77
Method: EM (single particle) / Resolution: 3.06 Å

PDB-7efv:
Crystal structure of octameric state of C-phycocyanin from Thermoleptolyngbya sp. O-77
Method: X-RAY DIFFRACTION / Resolution: 2.77 Å

PDB-7efw:
Crystal structure of hexameric state of C-phycocyanin from Thermoleptolyngbya sp. O-77
Method: X-RAY DIFFRACTION / Resolution: 1.65 Å

Chemicals

ChemComp-CYC:
PHYCOCYANOBILIN / Phycocyanobilin

ChemComp-GOL:
GLYCEROL / Glycerol

ChemComp-HOH:
WATER / Water

Source
  • leptolyngbya sp. o-77 (bacteria)
KeywordsPHOTOSYNTHESIS / light-harvesting complex / homo hexamer

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