1FNP

CRYSTAL STRUCTURE ANALYSIS OF THE MUTANT REACTION CENTER PRO L209-> PHE FROM THE PHOTOSYNTHETIC PURPLE BACTERIUM RHODOBACTER SPHAEROIDES


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.216 

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This is version 1.2 of the entry. See complete history

Literature

X-ray structure analyses of photosynthetic reaction center variants from Rhodobacter sphaeroides: structural changes induced by point mutations at position L209 modulate electron and proton transfer.

Kuglstatter, A.Ermler, U.Michel, H.Baciou, L.Fritzsch, G.

(2001) Biochemistry 40: 4253-4260

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The structures of the reaction center variants Pro L209 --> Tyr, Pro L209 --> Phe, and Pro L209 --> Glu from the photosynthetic purple bacterium Rhodobacter sphaeroides have been determined by X-ray crystallography to 2.6-2.8 A resolution. These vari ...

    The structures of the reaction center variants Pro L209 --> Tyr, Pro L209 --> Phe, and Pro L209 --> Glu from the photosynthetic purple bacterium Rhodobacter sphaeroides have been determined by X-ray crystallography to 2.6-2.8 A resolution. These variants were constructed to interrupt a chain of tightly bound water molecules that was assumed to facilitate proton transfer from the cytoplasm to the secondary quinone Q(B) [Baciou, L., and Michel, H. (1995) Biochemistry 34, 7967-7972]. However, the amino acid exchanges Pro L209 --> Tyr and Pro L209 --> Phe do not interrupt the water chain. Both aromatic side chains are oriented away from this water chain and interact with three surrounding polar side chains (Asp L213, Thr L226, and Glu H173) which are displaced by up to 2.6 A. The conformational changes induced by the bulky aromatic rings of Tyr L209 and Phe L209 lead to unexpected displacements of Q(B) compared to the wild-type protein. In the structure of the Pro L209 --> Tyr variant, Q(B) is shifted by approximately 4 A and is now located at a position similar to that reported for the wild-type reaction center after illumination [Stowell, M. H. B., et al. (1997) Science 276, 812-816]. In the Pro L209 --> Phe variant, the electron density map reveals an intermediate Q(B) position between the binding sites of the wild-type protein in the dark and the Pro L209 --> Tyr protein. In the Pro L209 --> Glu reaction center, the carboxylic side chain of Glu L209 is located within the water chain, and the binding site of Q(B) remains unchanged compared to the wild-type structure.


    Related Citations: 
    • In Rhodobacter sphaeroides Reaction Centers, Mutation of Proline L209 to Aromatic Residues in the Vicinity of a Water Channel Alters the Dynamic Coupling between Electron and Proton Transfer Processes.
      Tandori, J.,Sebban, P.,Michel, H.,Baciou, L.
      (1999) Biochemistry 40: 13179
    • Interruption of the Water Chain in the Reaction Center from Rhodobacter sphaeroides Reduces the Rates of the Proton Uptake and of the Second Electron Transfer to Q(B)
      Baciou, L.,Michel, H.
      (1995) Biochemistry 34: 7967


    Organizational Affiliation

    Max-Planck-Institut für Biophysik, H.-Hoffmann-Strasse 7, 60528 Frankfurt/M, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
REACTION CENTER PROTEIN L CHAIN
L
281Rhodobacter sphaeroidesMutation(s): 1 
Gene Names: pufL
Find proteins for P0C0Y8 (Rhodobacter sphaeroides)
Go to UniProtKB:  P0C0Y8
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
REACTION CENTER PROTEIN M CHAIN
M
307Rhodobacter sphaeroidesMutation(s): 0 
Gene Names: pufM
Find proteins for P0C0Y9 (Rhodobacter sphaeroides)
Go to UniProtKB:  P0C0Y9
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
REACTION CENTER PROTEIN H CHAIN
H
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
PO4
Query on PO4

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M
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
U10
Query on U10

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L, M
UBIQUINONE-10
Coenzyme Q10
C59 H90 O4
ACTIUHUUMQJHFO-UPTCCGCDSA-N
 Ligand Interaction
BCL
Query on BCL

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L, M
BACTERIOCHLOROPHYLL A
C55 H74 Mg N4 O6
DSJXIQQMORJERS-RUUWGSCADZ
 Ligand Interaction
LDA
Query on LDA

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H, L, M
LAURYL DIMETHYLAMINE-N-OXIDE
C14 H31 N O
SYELZBGXAIXKHU-UHFFFAOYSA-N
 Ligand Interaction
FE
Query on FE

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M
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
 Ligand Interaction
BPH
Query on BPH

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L, M
BACTERIOPHEOPHYTIN A
C55 H76 N4 O6
KWOZSBGNAHVCKG-SZQBJALDSA-N
 Ligand Interaction
SPO
Query on SPO

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M
SPHEROIDENE
C41 H60 O
FJOCMTHZSURUFA-KXCOHNEYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.216 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 141.748α = 90.00
b = 141.748β = 90.00
c = 187.415γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
DENZOdata reduction
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-04-18
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Non-polymer description, Version format compliance