1M3X

Photosynthetic Reaction Center From Rhodobacter Sphaeroides


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.185 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

Interactions between lipids and bacterial reaction centers determined by protein crystallography.

Camara-Artigas, A.Brune, D.Allen, J.P.

(2002) Proc Natl Acad Sci U S A 99: 11055-11060

  • DOI: https://doi.org/10.1073/pnas.162368399
  • Primary Citation of Related Structures:  
    1M3X

  • PubMed Abstract: 

    The structure of the reaction center from Rhodobacter sphaeroides has been solved by using x-ray diffraction at a 2.55-A resolution limit. Three lipid molecules that lie on the surface of the protein are resolved in the electron density maps. In addition to a cardiolipin that has previously been reported [McAuley, K. E., Fyfe, P. K., Ridge, J. P., Isaacs, N. W., Cogdell, R. J. & Jones, M. R. (1999) Proc. Natl. Acad. Sci. USA 96, 14706-14711], two other major lipids of the cell membrane are found, a phosphatidylcholine and a glucosylgalactosyl diacylglycerol. The presence of these three lipids has been confirmed by laser mass spectroscopy. The lipids are located in the hydrophobic region of the protein surface and interact predominately with hydrophobic amino acids, in particular aromatic residues. Although the cardiolipin is over 15 A from the cofactors, the other two lipids are in close contact with the cofactors and may contribute to the difference in energetics for the two branches of cofactors that is primarily responsible for the asymmetry of electron transfer. The glycolipid is 3.5 A from the active bacteriochlorophyll monomer and shields this cofactor from the solvent in contrast to a much greater exposed surface evident for the inactive bacteriochlorophyll monomer. The phosphate atom of phosphatidylcholine is 6.5 A from the inactive bacteriopheophytin, and the associated electrostatic interactions may contribute to electron transfer rates involving this cofactor. Overall, the lipids span a distance of approximately 30 A, which is consistent with a bilayer-like arrangement suggesting the presence of an "inner shell" of lipids around membrane proteins that is critical for membrane function.


  • Organizational Affiliation

    Department of Chemistry and Biochemistry and Center for the Study of Early Events in Photosynthesis, Arizona State University, Tempe, AZ 85287-1604, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Photosynthetic Reaction center protein L chainA [auth L]281Cereibacter sphaeroidesMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P0C0Y8 (Cereibacter sphaeroides)
Explore P0C0Y8 
Go to UniProtKB:  P0C0Y8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0C0Y8
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Photosynthetic Reaction center protein M chainB [auth M]307Cereibacter sphaeroidesMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P0C0Y9 (Cereibacter sphaeroides)
Explore P0C0Y9 
Go to UniProtKB:  P0C0Y9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0C0Y9
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Photosynthetic Reaction center protein H chainC [auth H]260Cereibacter sphaeroidesMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P0C0Y7 (Cereibacter sphaeroides)
Explore P0C0Y7 
Go to UniProtKB:  P0C0Y7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0C0Y7
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 9 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CDL
Query on CDL

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P [auth M]CARDIOLIPIN
C81 H156 O17 P2
XVTUQDWPJJBEHJ-KZCWQMDCSA-L
GGD
Query on GGD

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Q [auth M]NONADEC-10-ENOIC ACID 2-[3,4-DIHYDROXY-6-HYDROXYMETHYL-5-(3,4,5-TRIHYDROXY-6-HYDROXYMETHYL-TETRAHYDRO-PYRAN-2-YLOXY)-TETRAHYDRO-PYRAN-2-YLOXY] -1-OCTADEC-9-ENOYLOXYMETHYL-ETHYL ESTER
C52 H94 O15
OGKQOSUHVSQNSH-IQXSWRQFSA-N
BCL
Query on BCL

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D [auth L],
E [auth L],
F [auth L],
L [auth M]
BACTERIOCHLOROPHYLL A
C55 H74 Mg N4 O6
DSJXIQQMORJERS-AGGZHOMASA-M
BPH
Query on BPH

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G [auth L],
M
BACTERIOPHEOPHYTIN A
C55 H76 N4 O6
KWOZSBGNAHVCKG-SZQBJALDSA-N
U10
Query on U10

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H [auth L],
N [auth M]
UBIQUINONE-10
C59 H90 O4
ACTIUHUUMQJHFO-UPTCCGCDSA-N
PC1
Query on PC1

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I [auth L]1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE
C44 H88 N O8 P
NRJAVPSFFCBXDT-HUESYALOSA-N
SPO
Query on SPO

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O [auth M]SPHEROIDENE
C41 H60 O
FJOCMTHZSURUFA-KXCOHNEYSA-N
FE
Query on FE

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J [auth M]FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
CL
Query on CL

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K [auth M]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.185 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 141.8α = 90
b = 141.8β = 90
c = 187.5γ = 120
Software Package:
Software NamePurpose
CNSrefinement
MOSFLMdata reduction
CCP4data scaling
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-08-28
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2019-11-20
    Changes: Derived calculations
  • Version 1.4: 2024-02-14
    Changes: Data collection, Database references, Derived calculations, Refinement description, Structure summary