7EQD | pdb_00007eqd

STRUCTURE OF PHOTOSYNTHETIC LH1-RC SUPER-COMPLEX OF RHODOSPIRILLUM RUBRUM


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.76 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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wwPDB Validation 3D Report Full Report

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This is version 1.1 of the entry. See complete history

Literature

Cryo-EM Structure of the Photosynthetic LH1-RC Complex from Rhodospirillum rubrum .

Tani, K.Kanno, R.Ji, X.C.Hall, M.Yu, L.J.Kimura, Y.Madigan, M.T.Mizoguchi, A.Humbel, B.M.Wang-Otomo, Z.Y.

(2021) Biochemistry 

  • DOI: https://doi.org/10.1021/acs.biochem.1c00360
  • Primary Citation Related Structures: 
    7EQD

  • PubMed Abstract: 

    Rhodospirillum ( Rsp. ) rubrum is one of the most widely used model organisms in bacterial photosynthesis. This purple phototroph is characterized by the presence of both rhodoquinone (RQ) and ubiquinone as electron carriers and bacteriochlorophyll (BChl) a esterified at the propionic acid side chain by geranylgeraniol (BChl a G ) instead of phytol. Despite intensive efforts, the structure of the light-harvesting-reaction center (LH1-RC) core complex from Rsp. rubrum remains at low resolutions. Using cryo-EM, here we present a robust new view of the Rsp. rubrum LH1-RC at 2.76 Å resolution. The LH1 complex forms a closed, slightly elliptical ring structure with 16 αβ-polypeptides surrounding the RC. Our biochemical analysis detected RQ molecules in the purified LH1-RC, and the cryo-EM density map specifically positions RQ at the Q A site in the RC. The geranylgeraniol side chains of BChl a G coordinated by LH1 β-polypeptides exhibit a highly homologous tail-up conformation that allows for interactions with the bacteriochlorin rings of nearby LH1 α-associated BChls a G . The structure also revealed key protein-protein interactions in both N- and C-terminal regions of the LH1 αβ-polypeptides, mainly within a face-to-face structural subunit. Our high-resolution Rsp. rubrum LH1-RC structure provides new insight for evaluating past experimental and computational results obtained with this old organism over many decades and lays the foundation for more detailed exploration of light-energy conversion, quinone transport, and structure-function relationships in this pigment-protein complex.


  • Organizational Affiliation
    • Graduate School of Medicine, Mie University, Tsu, Mie 514-8507, Japan.

Macromolecule Content 

  • Total Structure Weight: 374.83 kDa 
  • Atom Count: 23,122 
  • Modeled Residue Count: 2,302 
  • Deposited Residue Count: 2,708 
  • Unique protein chains: 5

Macromolecules

Find similar proteins by:|  3D Structure
Entity ID: 1
MoleculeChains  Sequence LengthOrganismDetailsImage
Reaction center protein L chainA [auth L]275Rhodospirillum rubrumMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P10717 (Rhodospirillum rubrum)
Explore P10717 
Go to UniProtKB:  P10717
Entity Groups
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP10717
Sequence Annotations
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Reference Sequence
Find similar proteins by:|  3D Structure
Entity ID: 2
MoleculeChains  Sequence LengthOrganismDetailsImage
Reaction center protein M chainB [auth M]305Rhodospirillum rubrum ATCC 11170Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for Q2RQ26 (Rhodospirillum rubrum (strain ATCC 11170 / ATH 1.1.1 / DSM 467 / LMG 4362 / NCIMB 8255 / S1))
Explore Q2RQ26 
Go to UniProtKB:  Q2RQ26
Entity Groups
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ2RQ26
Sequence Annotations
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Reference Sequence
Find similar proteins by:|  3D Structure
Entity ID: 3
MoleculeChains  Sequence LengthOrganismDetailsImage
Photoreaction center protein HC [auth H]256Rhodospirillum rubrumMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for Q7M149 (Rhodospirillum rubrum)
Explore Q7M149 
Go to UniProtKB:  Q7M149
Entity Groups
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UniProt GroupQ7M149
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Reference Sequence
Find similar proteins by:|  3D Structure
Entity ID: 4
MoleculeChains  Sequence LengthOrganismDetailsImage
Light-harvesting protein B-870 alpha chain62Rhodospirillum rubrumMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P02947 (Rhodospirillum rubrum)
Explore P02947 
Go to UniProtKB:  P02947
Entity Groups
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UniProt GroupP02947
Sequence Annotations
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Reference Sequence
Find similar proteins by:|  3D Structure
Entity ID: 5
MoleculeChains  Sequence LengthOrganismDetailsImage
Light-harvesting protein B-870 beta chain55Rhodospirillum rubrum ATCC 11170Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for Q2RQ23 (Rhodospirillum rubrum (strain ATCC 11170 / ATH 1.1.1 / DSM 467 / LMG 4362 / NCIMB 8255 / S1))
Explore Q2RQ23 
Go to UniProtKB:  Q2RQ23
Entity Groups
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ2RQ23
Sequence Annotations
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Reference Sequence

Small Molecules

Ligands 10 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CDL

Query on CDL



Download:Ideal Coordinates CCD File
BB [auth H],
DB [auth H],
EB [auth H],
XA [auth M],
YA [auth M]
CARDIOLIPIN
C81 H156 O17 P2
XVTUQDWPJJBEHJ-KZCWQMDCSA-L
07D

Query on 07D



Download:Ideal Coordinates CCD File
BC [auth N]
BD [auth 1]
DC [auth O]
DD [auth 2]
FC [auth P]
BC [auth N],
BD [auth 1],
DC [auth O],
DD [auth 2],
FC [auth P],
FD [auth 3],
HB [auth A],
HC [auth Q],
HD [auth 4],
IC [auth Q],
JA [auth L],
JB [auth B],
KD [auth 5],
LB [auth D],
LC [auth S],
NB [auth E],
NC [auth T],
ND [auth 6],
PA [auth L],
PB [auth F],
PC [auth U],
PD [auth 7],
RB [auth G],
RC [auth V],
RD [auth 8],
SA [auth M],
TA [auth M],
TB [auth I],
TC [auth W],
TD [auth 9],
VB [auth J],
VC [auth X],
VD [auth 0],
XB [auth K],
XC [auth Y],
ZC [auth Z]
Trans-Geranyl BACTERIOCHLOROPHYLL A
C55 H64 Mg N4 O6
ZBSZXIUSELHDGQ-POZHEDQMSA-M
08I

Query on 08I



Download:Ideal Coordinates CCD File
KA [auth L],
UA [auth M]
Trans-Geranyl BACTERIOPHEOPHYTIN A
C55 H66 N4 O6
HZSDVJXREXKBMW-FAWFAMGLSA-N
U10

Query on U10



Download:Ideal Coordinates CCD File
LA [auth L],
QA [auth M]
UBIQUINONE-10
C59 H90 O4
ACTIUHUUMQJHFO-UPTCCGCDSA-N
RQ0
(Subject of Investigation/LOI)

Query on RQ0



Download:Ideal Coordinates CCD File
VA [auth M]2-azanyl-5-[(2~{E},6~{E},8~{E},10~{E},12~{E},14~{E},18~{E},22~{E},26~{E},30~{E},34~{E})-3,7,11,15,19,23,27,31,35,39-decamethyltetraconta-2,6,8,10,12,14,18,22,26,30,34,38-dodecaenyl]-3-methoxy-6-methyl-cyclohexa-2,5-diene-1,4-dione
C58 H85 N O3
WXESXKLCRFKYIR-NBYUNPNPSA-N
PGV

Query on PGV



Download:Ideal Coordinates CCD File
CB [auth H],
MA [auth L]
(1R)-2-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL (11E)-OCTADEC-11-ENOATE
C40 H77 O10 P
ADYWCMPUNIVOEA-GPJPVTGXSA-N
PEF

Query on PEF



Download:Ideal Coordinates CCD File
FB [auth H],
YB [auth K],
ZB [auth K]
DI-PALMITOYL-3-SN-PHOSPHATIDYLETHANOLAMINE
C37 H74 N O8 P
SLKDGVPOSSLUAI-PGUFJCEWSA-N
CRT

Query on CRT



Download:Ideal Coordinates CCD File
AC [auth N]
CD [auth 2]
EC [auth P]
GD [auth 4]
IB [auth A]
AC [auth N],
CD [auth 2],
EC [auth P],
GD [auth 4],
IB [auth A],
JC [auth R],
MB [auth E],
MC [auth T],
MD [auth 6],
QB [auth G],
QC [auth V],
QD [auth 8],
UB [auth J],
UC [auth X],
UD [auth 0],
WA [auth M],
YC [auth Z]
SPIRILLOXANTHIN
C42 H60 O2
VAZQBTJCYODOSV-RISZBRKMSA-N
LMT

Query on LMT



Download:Ideal Coordinates CCD File
AB [auth M]
AD [auth Z]
CC [auth N]
ED [auth 2]
GB [auth H]
AB [auth M],
AD [auth Z],
CC [auth N],
ED [auth 2],
GB [auth H],
GC [auth P],
ID [auth 4],
JD [auth 5],
KB [auth B],
KC [auth R],
LD [auth 5],
NA [auth L],
OA [auth L],
OB [auth E],
OC [auth T],
OD [auth 6],
SB [auth G],
SC [auth V],
SD [auth 8],
WB [auth J],
WC [auth X],
WD [auth 0],
ZA [auth M]
DODECYL-BETA-D-MALTOSIDE
C24 H46 O11
NLEBIOOXCVAHBD-QKMCSOCLSA-N
FE

Query on FE



Download:Ideal Coordinates CCD File
RA [auth M]FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
FME
Query on FME
BA [auth 3]
D [auth A]
DA [auth 5]
F [auth D]
FA [auth 7]
BA [auth 3],
D [auth A],
DA [auth 5],
F [auth D],
FA [auth 7],
H [auth F],
HA [auth 9],
J [auth I],
L [auth K],
N [auth O],
P [auth Q],
R [auth S],
T [auth U],
V [auth W],
X [auth Y],
Z [auth 1]
L-PEPTIDE LINKINGC6 H11 N O3 SMET

Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.76 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION3.1
MODEL REFINEMENTPHENIX

Structure Validation

View Full Validation Report



Entry History 

& Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Japan Agency for Medical Research and Development (AMED)JapanJP21am0101118
Japan Agency for Medical Research and Development (AMED)JapanJP21am0101116
Japan Society for the Promotion of Science (JSPS)JapanJP16H04174
Japan Society for the Promotion of Science (JSPS)JapanJP18H05153
Japan Society for the Promotion of Science (JSPS)Japan20H05086
Japan Society for the Promotion of Science (JSPS)Japan20H02856

Revision History  (Full details and data files)

  • Version 1.0: 2021-08-18
    Type: Initial release
  • Version 1.1: 2024-11-13
    Changes: Data collection, Refinement description, Structure summary