ISDA

Deposition Date 2022-11-11

Release Date 2023-11-08

Last Version Date 2023-11-08

Entry Detail

PDB ID:

8HFQ

Keywords:

PHOTOSYNTHESIS

Title:

Cryo-EM structure of CpcL-PBS from cyanobacterium Synechocystis sp. PCC 6803

Biological Source:

Source Organism:

Synechocystis sp. (strain PCC 6803 / Kazusa) (Taxon ID: 1111708)

Host Organism:

Synechocystis sp. PCC 6803

Method Details:

Experimental Method:

ELECTRON MICROSCOPY

Resolution:

2.64 Å

Aggregation State:

PARTICLE

Reconstruction Method:

SINGLE PARTICLE

Download Validation Report

Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:C-phycocyanin alpha subunit
Gene (Uniprot):cpcA
Chain IDs:A, C, E, G, I, K, M, O, Q, S, U, W, Y, AA (auth: a), CA (auth: c), EA (auth: e), GA (auth: g), IA (auth: i)
Chain Length:162
Number of Molecules:18
Biological Source:Synechocystis sp. (strain PCC 6803 / Kazusa)

UniProt ID:Q54715 Pfam ID:PF00502

Protein Blast

Polymer Type:polypeptide(L)
Molecule:C-phycocyanin beta subunit
Gene (Uniprot):cpcB
Chain IDs:B, D, F, H, J, L, N, P, R, T, V, X, Z, BA (auth: b), DA (auth: d), FA (auth: f), HA (auth: h), JA (auth: j)
Chain Length:172
Number of Molecules:18
Biological Source:Synechocystis sp. (strain PCC 6803 / Kazusa)

UniProt ID:Q54714 Pfam ID:PF00502

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Phycobilisome 32.1 kDa linker polypeptide, phycocyanin-associated, rod 1
Gene (Uniprot):cpcC1
Chain IDs:KA (auth: k)
Chain Length:291
Number of Molecules:1
Biological Source:Synechocystis sp. (strain PCC 6803 / Kazusa)

UniProt ID:P73203 Pfam ID:PF00427, PF01383

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Phycobilisome 32.1 kDa linker polypeptide, phycocyanin-associated, rod 2
Gene (Uniprot):cpcC2
Chain IDs:LA (auth: l)
Chain Length:273
Number of Molecules:1
Biological Source:Synechocystis sp. (strain PCC 6803 / Kazusa)

UniProt ID:P73204 Pfam ID:PF00427, PF01383

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Ferredoxin--NADP reductase
Gene (Uniprot):petH
Chain IDs:MA (auth: m)
Chain Length:413
Number of Molecules:1
Biological Source:Synechocystis sp. (strain PCC 6803 / Kazusa)

UniProt ID:Q55318 Pfam ID:PF01383, PF00175 EC:1.18.1.2

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Photosystem I-associated linker protein CpcL
Gene (Uniprot):cpcL
Chain IDs:NA (auth: n)
Chain Length:172
Number of Molecules:1
Biological Source:Synechocystis sp. (strain PCC 6803 / Kazusa)

UniProt ID:P74625 Pfam ID:PF00427

Ligand Molecules

CYC

Primary Citation

Cryo-EM and femtosecond spectroscopic studies provide mechanistic insight into the energy transfer in CpcL-phycobilisomes.

Zheng, L, Zhang, Z, Wang, H, Zheng, Z, Wang, J, Liu, H, Chen, H, Dong, C, Wang, G, Weng, Y, Gao, N, Zhao, J.Show

Nat Commun 14 3961 3961 (2023)

PMID: 37407580 DOI: 10.1038/s41467-023-39689-7

Abstact

Phycobilisomes (PBS) are the major light harvesting complexes of photosynthesis in the cyanobacteria and red algae. CpcL-PBS is a type of small PBS in cyanobacteria that transfers energy directly to photosystem I without the core structure. Here we report the cryo-EM structure of the CpcL-PBS from the cyanobacterium Synechocystis sp. PCC 6803 at 2.6-Å resolution. The structure shows the CpcD domain of ferredoxin: NADP+ oxidoreductase is located at the distal end of CpcL-PBS, responsible for its attachment to PBS. With the evidence of ultrafast transient absorption and fluorescence spectroscopy, the roles of individual bilins in energy transfer are revealed. The bilin 1Iβ822 located near photosystem I has an enhanced planarity and is the red-bilin responsible for the direct energy transfer to photosystem I.

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Primary Citation of related structures