8B64 image
Entry Detail
PDB ID:
8B64
EMDB ID:
EMD-15862
Keywords:
PHOTOSYNTHESIS
Title:
Cryo-EM structure of RC-LH1-PufX photosynthetic core complex from Rba. capsulatus
Biological Source:
Source Organism:
Rhodobacter capsulatus
PDB Version:
Deposition Date:
2022-09-26
Release Date:
2023-02-01
Method Details:
Experimental Method:
ELECTRON MICROSCOPY
Resolution:
2.59 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
8B64 validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:LH1 beta chain
Chain IDs:C (auth: D), E (auth: A), F (auth: E), L (auth: B), N (auth: S), O (auth: T), Q (auth: U), T (auth: O), U (auth: R), X (auth: K), Y (auth: N), BA (auth: I), CA (auth: J), FA (auth: F), GA (auth: G)
Chain Length:58
Number of Molecules:15
Biological Source:Rhodobacter capsulatus
UniProt ID:P02950 Pfam ID:PF00556
Protein Blast
Polymer Type:polypeptide(L)
Description:Reaction center protein H chain
Chain IDs:J (auth: H)
Chain Length:254
Number of Molecules:1
Biological Source:Rhodobacter capsulatus
UniProt ID:P19056 Pfam ID:PF03967, PF05239
Protein Blast
Polymer Type:polypeptide(L)
Description:Reaction center protein L chain
Chain IDs:H (auth: L)
Chain Length:282
Number of Molecules:1
Biological Source:Rhodobacter capsulatus
UniProt ID:P19057 Pfam ID:PF00124
Protein Blast
Polymer Type:polypeptide(L)
Description:Reaction center protein M chain
Chain IDs:I (auth: M)
Chain Length:307
Number of Molecules:1
Biological Source:Rhodobacter capsulatus
UniProt ID:P11847 Pfam ID:PF00124
Protein Blast
Polymer Type:polypeptide(L)
Description:Intrinsic membrane protein PufX
Chain IDs:G (auth: X)
Chain Length:78
Number of Molecules:1
Biological Source:Rhodobacter capsulatus
UniProt ID:P26240 Pfam ID:PF11511
Protein Blast
Polymer Type:polypeptide(L)
Description:Light-harvesting protein B-870 alpha chain
Chain IDs:A (auth: a), B (auth: e), D (auth: b), K (auth: d), M (auth: t), P (auth: s), R (auth: u), S (auth: r), V (auth: o), W (auth: n), Z (auth: k), AA (auth: j), DA (auth: i), EA (auth: g), HA (auth: f)
Chain Length:58
Number of Molecules:15
Biological Source:Rhodobacter capsulatus
UniProt ID:P02948 Pfam ID:PF00556
Ligand Molecules
3PE
BCL
BPH
FE
SPO
U10
Primary Citation
Cryo-EM structure of a monomeric RC-LH1-PufX supercomplex with high-carotenoid content from Rhodobacter capsulatus.
Structure 31 318 ? (2023)
PMID: 36738736 DOI: 10.1016/j.str.2023.01.006

Abstact

In purple photosynthetic bacteria, the photochemical reaction center (RC) and light-harvesting complex 1 (LH1) assemble to form monomeric or dimeric RC-LH1 membrane complexes, essential for bacterial photosynthesis. Here, we report a 2.59-Å resolution cryoelectron microscopy (cryo-EM) structure of the RC-LH1 supercomplex from Rhodobacter capsulatus. We show that Rba. capsulatus RC-LH1 complexes are exclusively monomers in which the RC is surrounded by a 15-subunit LH1 ring. Incorporation of a transmembrane polypeptide PufX leads to a large opening within the LH1 ring. Each LH1 subunit associates two carotenoids and two bacteriochlorophylls, which is similar to Rba. sphaeroides RC-LH1 but more than one carotenoid per LH1 in Rba. veldkampii RC-LH1 monomer. Collectively, the unique Rba. capsulatus RC-LH1-PufX represents an intermediate structure between Rba. sphaeroides and Rba. veldkampii RC-LH1-PufX. Comparison of PufX from the three Rhodobacter species indicates the important residues involved in dimerization of RC-LH1.

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Primary Citation of related structures
8B64