9J2F | pdb_00009j2f

Structure of photosynthetic LH1-RC complex from the purple bacterium Blastochloris tepida


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report

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This is version 1.2 of the entry. See complete history

Literature

The Thermal-Stable LH1-RC Complex of a Hot Spring Purple Bacterium Powers Photosynthesis with Extremely Low-Energy Near-Infrared Light.

Kimura, Y.Kanno, R.Mori, K.Matsuda, Y.Seto, R.Takenaka, S.Mino, H.Ohkubo, T.Honda, M.Sasaki, Y.C.Kishikawa, J.I.Mitsuoka, K.Mio, K.Hall, M.Purba, E.R.Mochizuki, T.Mizoguchi, A.Humbel, B.M.Madigan, M.T.Wang-Otomo, Z.Y.Tani, K.

(2025) Biochemistry 64: 170-179

  • DOI: https://doi.org/10.1021/acs.biochem.4c00506
  • Primary Citation Related Structures: 
    9J2F

  • PubMed Abstract: 

    Blastochloris (Blc.) tepida is a hot spring purple nonsulfur phototrophic bacterium that contains bacteriochlorophyll (BChl) b . Here, we present a 2.21 Å cryo-EM structure of the thermostable light-harvesting 1-reaction center (LH1-RC) complex from Blc. tepida . The LH1 ring comprises 16 circularly arranged αβγ-subunits plus one αβ-subunit that surround the RC complex composed of C-, H-, L-, and M-subunits. In a comparative study, the Blc. tepida LH1-RC showed numerous electrostatic and hydrophobic interactions both within the LH1 complex itself and between the LH1 and the RC complexes that are absent from the LH1-RC complex of its mesophilic counterpart, Blc. viridis . These additional interactions result in a tightly packed LH1-RC architecture with a reduced accessible surface area per volume that enhances the thermal stability of the Blc. tepida complex and allows the light reactions of photosynthesis to proceed at hot spring temperatures. Moreover, based on high-resolution structural information combined with spectroscopic evidence, the unique photosynthetic property of the Blc. tepida LH1-RC─absorption of energy-poor near-infrared light beyond 1000 nm─can be attributed to strong hydrogen-bonding interactions between the C3-acetyl C═O of the LH1 BChl b and two LH1 α-Trp residues, structural rigidity of the LH1, and the enhanced exciton coupling of the LH1 BChls of this thermophile.


  • Organizational Affiliation
    • Department of Agrobioscience, Graduate School of Agriculture, Kobe University, Kobe, Nada 657-8501, Japan.

Macromolecule Content 

  • Total Structure Weight: 562.61 kDa 
  • Atom Count: 32,918 
  • Modeled Residue Count: 3,464 
  • Deposited Residue Count: 4,477 
  • Unique protein chains: 8

Macromolecules

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Entity ID: 1
MoleculeChains  Sequence LengthOrganismDetailsImage
Photosynthetic reaction center cytochrome c subunitA [auth C]354Blastochloris tepidaMutation(s): 0 
UniProt
Find proteins for A0A348FW74 (Blastochloris tepida)
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Entity Groups
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UniProt GroupA0A348FW74
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Reference Sequence
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Entity ID: 2
MoleculeChains  Sequence LengthOrganismDetailsImage
Reaction center protein L chainB [auth L]274Blastochloris tepidaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for A0A348FW72 (Blastochloris tepida)
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UniProt GroupA0A348FW72
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Reference Sequence
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Entity ID: 3
MoleculeChains  Sequence LengthOrganismDetailsImage
Reaction center protein M chainC [auth M]332Blastochloris tepidaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for A0A348FW73 (Blastochloris tepida)
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UniProt GroupA0A348FW73
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Reference Sequence
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Entity ID: 4
MoleculeChains  Sequence LengthOrganismDetailsImage
Photosynthetic reaction center subunit HD [auth H]260Blastochloris tepidaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for A0A348FW44 (Blastochloris tepida)
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UniProt GroupA0A348FW44
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Reference Sequence
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Entity ID: 5
MoleculeChains  Sequence LengthOrganismDetailsImage
Antenna complex alpha/beta subunit domain-containing protein69Blastochloris tepidaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for A0A348FW71 (Blastochloris tepida)
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UniProt GroupA0A348FW71
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Reference Sequence
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Entity ID: 6
MoleculeChains  Sequence LengthOrganismDetailsImage
Antenna complex alpha/beta subunit domain-containing protein69Blastochloris tepidaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for A0A348FW70 (Blastochloris tepida)
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UniProt GroupA0A348FW70
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Reference Sequence
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Entity ID: 7
MoleculeChains  Sequence LengthOrganismDetailsImage
Light-harvesting protein gamma156Blastochloris tepidaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for A0A348G0X9 (Blastochloris tepida)
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UniProt GroupA0A348G0X9
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Reference Sequence
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Entity ID: 8
MoleculeChains  Sequence LengthOrganismDetailsImage
Light-harvesting protein B-1015 gamma chain57Blastochloris tepidaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for A0A348G0Y0 (Blastochloris tepida)
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UniProt GroupA0A348G0Y0
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Reference Sequence

Small Molecules

Ligands 13 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CDL

Query on CDL



Download:Ideal Coordinates CCD File
AC [auth H],
ME [auth r],
NB [auth L],
WB [auth M],
ZB [auth H]
CARDIOLIPIN
C81 H156 O17 P2
XVTUQDWPJJBEHJ-KZCWQMDCSA-L
BCB
(Subject of Investigation/LOI)

Query on BCB



Download:Ideal Coordinates CCD File
AD [auth W]
BE [auth k]
CC [auth A]
DD [auth X]
ED [auth Z]
AD [auth W],
BE [auth k],
CC [auth A],
DD [auth X],
ED [auth Z],
EE [auth l],
FC [auth B],
FD [auth 1],
FE [auth n],
GC [auth D],
HD [auth 3],
ID [auth 4],
IE [auth o],
JB [auth L],
JC [auth E],
JD [auth 6],
JE [auth q],
KB [auth L],
KC [auth I],
LD [auth 7],
LE [auth r],
MC [auth J],
MD [auth 9],
NC [auth N],
PB [auth M],
PD [auth 0],
QB [auth M],
QC [auth O],
QD [auth b],
SC [auth Q],
TD [auth c],
UC [auth R],
UD [auth e],
VC [auth T],
VD [auth f],
XD [auth h],
YC [auth U],
ZD [auth i]
BACTERIOCHLOROPHYLL B
C55 H72 Mg N4 O6
QNWPCDKNPGOYNP-DSENBSCCSA-M
BPB

Query on BPB



Download:Ideal Coordinates CCD File
LB [auth L],
RB [auth M]
BACTERIOPHEOPHYTIN B
C55 H74 N4 O6
SFKCKJXMIAKQMY-GTTFDWDMSA-N
PGV

Query on PGV



Download:Ideal Coordinates CCD File
HC [auth D]
LC [auth I]
OC [auth N]
RC [auth Q]
YB [auth M]
HC [auth D],
LC [auth I],
OC [auth N],
RC [auth Q],
YB [auth M],
ZC [auth W]
(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
UQ8

Query on UQ8



Download:Ideal Coordinates CCD File
BC [auth A],
HB [auth C],
MB [auth L],
UB [auth M],
VB [auth M]
Ubiquinone-8
C49 H74 O4
ICFIZJQGJAJRSU-SGHXUWJISA-N
MQ7

Query on MQ7



Download:Ideal Coordinates CCD File
SB [auth M]MENAQUINONE-7
C46 H64 O2
RAKQPZMEYJZGPI-LJWNYQGCSA-N
DGA

Query on DGA



Download:Ideal Coordinates CCD File
IB [auth L]DIACYL GLYCEROL
C39 H76 O5
UHUSDOQQWJGJQS-QNGWXLTQSA-N
HEC

Query on HEC



Download:Ideal Coordinates CCD File
CB [auth C],
DB [auth C],
EB [auth C],
FB [auth C]
HEME C
C34 H34 Fe N4 O4
HXQIYSLZKNYNMH-LJNAALQVSA-N
NS5

Query on NS5



Download:Ideal Coordinates CCD File
TB [auth M]15-cis-1,2-dihydroneurosporene
C40 H60
NHKJSVKSSGKUCH-DBWJSHEJSA-N
NS0

Query on NS0



Download:Ideal Coordinates CCD File
AE [auth k]
BD [auth W]
CD [auth X]
DC [auth A]
DE [auth l]
AE [auth k],
BD [auth W],
CD [auth X],
DC [auth A],
DE [auth l],
GD [auth 2],
HE [auth o],
IC [auth D],
KD [auth 7],
KE [auth q],
ND [auth 9],
OD [auth 0],
PC [auth O],
TC [auth R],
WD [auth h],
XC [auth U]
all-trans-1,2-dihydroneurosporene
C40 H60
NHKJSVKSSGKUCH-XILUKMICSA-N
LMT

Query on LMT



Download:Ideal Coordinates CCD File
CE [auth k]
EC [auth B]
GE [auth n]
RD [auth b]
SD [auth b]
CE [auth k],
EC [auth B],
GE [auth n],
RD [auth b],
SD [auth b],
WC [auth T],
XB [auth M],
YD [auth h]
DODECYL-BETA-D-MALTOSIDE
C24 H46 O11
NLEBIOOXCVAHBD-QKMCSOCLSA-N
FE

Query on FE



Download:Ideal Coordinates CCD File
OB [auth M]FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
MG

Query on MG



Download:Ideal Coordinates CCD File
GB [auth C]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
FME
Query on FME
D [auth H]L-PEPTIDE LINKINGC6 H11 N O3 SMET

Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
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: 2024-12-18
    Type: Initial release
  • Version 1.1: 2025-04-23
    Changes: Data collection, Database references
  • Version 1.2: 2025-07-02
    Changes: Data collection