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Structure paper

TitleStructure of phycobilisome from the red alga Griffithsia pacifica.
Journal, issue, pagesNature, Vol. 551, Issue 7678, Page 57-63, Year 2017
Publish dateNov 2, 2017
AuthorsJun Zhang / Jianfei Ma / Desheng Liu / Song Qin / Shan Sun / Jindong Zhao / Sen-Fang Sui /
PubMed AbstractLife on Earth depends on photosynthesis for its conversion of solar energy to chemical energy. Photosynthetic organisms have developed a variety of light-harvesting systems to capture sunlight. The ...Life on Earth depends on photosynthesis for its conversion of solar energy to chemical energy. Photosynthetic organisms have developed a variety of light-harvesting systems to capture sunlight. The largest light-harvesting complex is the phycobilisome (PBS), the main light-harvesting antenna in cyanobacteria and red algae. It is composed of phycobiliproteins and linker proteins but the assembly mechanisms and energy transfer pathways of the PBS are not well understood. Here we report the structure of a 16.8-megadalton PBS from a red alga at 3.5 Å resolution obtained by single-particle cryo-electron microscopy. We modelled 862 protein subunits, including 4 linkers in the core, 16 rod-core linkers and 52 rod linkers, and located a total of 2,048 chromophores. This structure reveals the mechanisms underlying specific interactions between linkers and phycobiliproteins, and the formation of linker skeletons. These results provide a firm structural basis for our understanding of complex assembly and the mechanisms of energy transfer within the PBS.
External linksNature / PubMed:29045394
MethodsEM (single particle)
Resolution3.43 - 4.29 Å
Structure data

EMDB-6758:
Local map for the core region of the phycobilisome from the red alga Griffithsia pacifica
Method: EM (single particle) / Resolution: 3.43 Å

EMDB-6759:
Local map for the Rd region of the phycobilisome from the red alga Griffithsia pacifica
Method: EM (single particle) / Resolution: 3.68 Å

EMDB-6760:
Local map for the Ra region of the phycobilisome from the red alga Griffithsia pacifica
Method: EM (single particle) / Resolution: 3.72 Å

EMDB-6761:
Local map for the Re region of the phycobilisome from the red alga Griffithsia pacifica
Method: EM (single particle) / Resolution: 3.5 Å

EMDB-6762:
Local map for the Rc region of the phycobilisome from the red alga Griffithsia pacifica
Method: EM (single particle) / Resolution: 3.58 Å

EMDB-6763:
Local map for the Rb region of the phycobilisome from the red alga Griffithsia pacifica
Method: EM (single particle) / Resolution: 3.59 Å

EMDB-6764:
Local map for the Rf region of the phycobilisome from the red alga Griffithsia pacifica
Method: EM (single particle) / Resolution: 4.29 Å

EMDB-6765:
Local map for the Rg region of the phycobilisome from the red alga Griffithsia pacifica
Method: EM (single particle) / Resolution: 3.74 Å

EMDB-6766:
Local map for the Ha region of the phycobilisome from the red alga Griffithsia pacifica
Method: EM (single particle) / Resolution: 3.95 Å

EMDB-6767:
Local map for the Hb region of the phycobilisome from the red alga Griffithsia pacifica
Method: EM (single particle) / Resolution: 3.87 Å

EMDB-6768:
Local map for the Hd region of the phycobilisome from the red alga Griffithsia pacifica
Method: EM (single particle) / Resolution: 3.81 Å

6769

5y6p

EMDB-6769: Overall map of the phycobilisome from the red alga Griffithsia pacifica
PDB-5y6p: Structure of the phycobilisome from the red alga Griffithsia pacifica
Method: EM (single particle) / Resolution: 3.5 Å

Chemicals

ChemComp-PEB:
PHYCOERYTHROBILIN / Phycoerythrobilin

ChemComp-CYC:
PHYCOCYANOBILIN / Phycocyanobilin

ChemComp-PUB:
PHYCOUROBILIN / Phycourobilin

ChemComp-PVN:
PHYCOVIOLOBILIN

Source
  • griffithsia pacifica (eukaryote)
KeywordsPHOTOSYNTHESIS / phycobilisome

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