1DV3

PHOTOSYNTHETIC REACTION CENTER FROM RHODOBACTER SPHAEROIDES IN THE CHARGE-SEPARATED D+QAQB-STATE WITH THE PROTON TRANSFER INHIBITOR CD2+


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.227 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Determination of the binding sites of the proton transfer inhibitors Cd2+ and Zn2+ in bacterial reaction centers.

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

(2000) Proc Natl Acad Sci U S A 97: 1542-1547

  • DOI: 10.1073/pnas.97.4.1542
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The reaction center (RC) from Rhodobacter sphaeroides couples light-driven electron transfer to protonation of a bound quinone acceptor molecule, Q(B), within the RC. The binding of Cd(2+) or Zn(2+) has been previously shown to inhibit the rate of re ...

    The reaction center (RC) from Rhodobacter sphaeroides couples light-driven electron transfer to protonation of a bound quinone acceptor molecule, Q(B), within the RC. The binding of Cd(2+) or Zn(2+) has been previously shown to inhibit the rate of reduction and protonation of Q(B). We report here on the metal binding site, determined by x-ray diffraction at 2.5-A resolution, obtained from RC crystals that were soaked in the presence of the metal. The structures were refined to R factors of 23% and 24% for the Cd(2+) and Zn(2+) complexes, respectively. Both metals bind to the same location, coordinating to Asp-H124, His-H126, and His-H128. The rate of electron transfer from Q(A)(-) to Q(B) was measured in the Cd(2+)-soaked crystal and found to be the same as in solution in the presence of Cd(2+). In addition to the changes in the kinetics, a structural effect of Cd(2+) on Glu-H173 was observed. This residue was well resolved in the x-ray structure-i.e., ordered-with Cd(2+) bound to the RC, in contrast to its disordered state in the absence of Cd(2+), which suggests that the mobility of Glu-H173 plays an important role in the rate of reduction of Q(B). The position of the Cd(2+) and Zn(2+) localizes the proton entry into the RC near Asp-H124, His-H126, and His-H128. Based on the location of the metal, likely pathways of proton transfer from the aqueous surface to Q(B) are proposed.


    Related Citations: 
    • Identification of the Proton Pathway in Bacterial Reaction Centers: Inhibition of Proton Transfer by Binding of Zn2+ or Cd2+
      Paddock, M.L., Graige, M.S., Feher, G., Okamura, M.Y.
      (1999) Proc Natl Acad Sci U S A 96: 6183
    • Identification of proton transfer pathways in the X-ray crystal structure of the bacterial reaction center from Rhodobacter sphaeroides
      Abresch, E.C., Paddock, M.L., Stowell, M.H.B., McPhillips, T.M., Axelrod, H.L., Soltis, S.M., Rees, D.C., Okamura, M.Y., Feher, G.
      (1998) Photosynth Res 55: 119
    • Light-Induced Structural Changes in Photosynthetic Reaction Center: Implications for Mechanism of Electron-Proton Transfer
      Stowell, M.H., McPhillips, T.M., Rees, D.C., Soltis, S.M., Abresch, E., Feher, G.
      (1997) Science 276: 812

    Organizational Affiliation

    Department of Physics 0319, 9500 Gilman Drive, University of California at San Diego, La Jolla, CA 92093, USA.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PHOTOSYNTHETIC REACTION CENTER REACTION CENTER
L, R
281Rhodobacter sphaeroidesMutation(s): 0 
Gene Names: pufL
Find proteins for P0C0Y8 (Rhodobacter sphaeroides)
Go to UniProtKB:  P0C0Y8

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PHOTOSYNTHETIC REACTION CENTER REACTION CENTER
M, S
307Rhodobacter sphaeroidesMutation(s): 0 
Gene Names: pufM
Find proteins for P0C0Y9 (Rhodobacter sphaeroides)
Go to UniProtKB:  P0C0Y9

Find similar proteins by: Sequence  |  Structure

Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
PHOTOSYNTHETIC REACTION CENTER REACTION CENTER
H, T
260Rhodobacter sphaeroidesMutation(s): 0 
Gene Names: puhA
Find proteins for P0C0Y7 (Rhodobacter sphaeroides)
Go to UniProtKB:  P0C0Y7
Small Molecules
Ligands 7 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BCL
Query on BCL

Download CCD File 
L, M, R, S
BACTERIOCHLOROPHYLL A
C55 H74 Mg N4 O6
DSJXIQQMORJERS-RUUWGSCADZ
 Ligand Interaction
BPH
Query on BPH

Download CCD File 
L, M, R, S
BACTERIOPHEOPHYTIN A
C55 H76 N4 O6
KWOZSBGNAHVCKG-SZQBJALDSA-N
 Ligand Interaction
U10
Query on U10

Download CCD File 
L, M, R, S
UBIQUINONE-10
C59 H90 O4
ACTIUHUUMQJHFO-UPTCCGCDSA-N
 Ligand Interaction
LDA
Query on LDA

Download CCD File 
M
LAURYL DIMETHYLAMINE-N-OXIDE
C14 H31 N O
SYELZBGXAIXKHU-UHFFFAOYSA-N
 Ligand Interaction
CD
Query on CD

Download CCD File 
H, T
CADMIUM ION
Cd
WLZRMCYVCSSEQC-UHFFFAOYSA-N
 Ligand Interaction
FE2
Query on FE2

Download CCD File 
M, S
FE (II) ION
Fe
CWYNVVGOOAEACU-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download CCD File 
M, S
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.227 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 141.25α = 90
b = 141.25β = 90
c = 275.33γ = 90
Software Package:
Software NamePurpose
CNSrefinement
MOSFLMdata reduction
CCP4data scaling
CNSphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-03-08
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance