1YF6

Structure of a quintuple mutant of photosynthetic reaction center from rhodobacter sphaeroides


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.197 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

Quinone (Q(B)) Reduction by B-Branch Electron Transfer in Mutant Bacterial Reaction Centers from Rhodobacter sphaeroides: Quantum Efficiency and X-ray Structure.

Paddock, M.L.Chang, C.Xu, Q.Abresch, E.C.Axelrod, H.L.Feher, G.Okamura, M.Y.

(2005) Biochemistry 44: 6920-6928

  • DOI: https://doi.org/10.1021/bi047559m
  • Primary Citation of Related Structures:  
    1YF6

  • PubMed Abstract: 

    The photosynthetic reaction center (RC) from purple bacteria converts light into chemical energy. Although the RC shows two nearly structurally symmetric branches, A and B, light-induced electron transfer in the native RC occurs almost exclusively along the A-branch to a primary quinone electron acceptor Q(A). Subsequent electron and proton transfer to a mobile quinone molecule Q(B) converts it to a quinol, Q(B)H(2). We report the construction and characterization of a series of mutants in Rhodobacter sphaeroides designed to reduce Q(B) via the B-branch. The quantum efficiency to Q(B) via the B-branch Phi(B) ranged from 0.4% in an RC containing the single mutation Ala-M260 --> Trp to 5% in a quintuple mutant which includes in addition three mutations to inhibit transfer along the A-branch (Gly-M203 --> Asp, Tyr-M210 --> Phe, Leu-M214 --> His) and one to promote transfer along the B-branch (Phe-L181 --> Tyr). Comparing the value of 0.4% for Phi(B) obtained in the AW(M260) mutant, which lacks Q(A), to the 100% quantum efficiency for Phi(A) along the A-branch in the native RC, we obtain a ratio for A-branch to B-branch electron transfer of 250:1. We determined the structure of the most effective (quintuple) mutant RC at 2.25 A (R-factor = 19.6%). The Q(A) site did not contain a quinone but was occupied by the side chain of Trp-M260 and a Cl(-). In this structure a nonfunctional quinone was found to occupy a new site near M258 and M268. The implications of this work to trap intermediate states are discussed.


  • Organizational Affiliation

    Department of Physics, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, USA. mpaddock@physics.ucsd.edu


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Reaction center protein L chainA [auth L]281Cereibacter sphaeroidesMutation(s): 1 
Gene Names: pufL
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
Reaction center protein M chainB [auth M]307Cereibacter sphaeroidesMutation(s): 4 
Gene Names: pufM
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
Reaction center protein H chainC [auth H]260Cereibacter sphaeroidesMutation(s): 0 
Gene Names: puhA
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
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  • Reference Sequence
Small Molecules
Ligands 11 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CDL
Query on CDL

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V [auth M]CARDIOLIPIN
C81 H156 O17 P2
XVTUQDWPJJBEHJ-KZCWQMDCSA-L
BCL
Query on BCL

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

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

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

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

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J [auth L],
K [auth L],
W [auth M]
LAURYL DIMETHYLAMINE-N-OXIDE
C14 H31 N O
SYELZBGXAIXKHU-UHFFFAOYSA-N
HTO
Query on HTO

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I [auth L]HEPTANE-1,2,3-TRIOL
C7 H16 O3
HXYCHJFUBNTKQR-RNFRBKRXSA-N
PO4
Query on PO4

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O [auth M],
P [auth M]
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
GOL
Query on GOL

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L
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
FE2
Query on FE2

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M
FE (II) ION
Fe
CWYNVVGOOAEACU-UHFFFAOYSA-N
CL
Query on CL

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.197 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 139.442α = 90
b = 139.442β = 90
c = 185.46γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
CNSrefinement
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: 2005-05-17
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-08-23
    Changes: Data collection, Refinement description