3ENI

Crystal structure of the Fenna-Matthews-Olson Protein from Chlorobaculum Tepidum

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.166 

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Literature

The structural basis for the difference in absorbance spectra for the FMO antenna protein from various green sulfur bacteria.

Tronrud, D.E., Wen, J., Gay, L., Blankenship, R.E.

(2009) Photosynth Res 100: 79-87

  • DOI: https://doi.org/10.1007/s11120-009-9430-6
  • Primary Citation of Related Structures:  
    3ENI, 3EOJ

  • PubMed Abstract: 

    • The absorbance spectrum of the Fenna-Matthews-Olson protein--a component of the antenna system of Green Sulfur Bacteria--is always one of two types, depending on the species of the source organism. The FMO from Prosthecochloris aestuarii 2K has a spectrum of type 1 while that from Chlorobaculum tepidum is of type 2 ...

    The absorbance spectrum of the Fenna-Matthews-Olson protein--a component of the antenna system of Green Sulfur Bacteria--is always one of two types, depending on the species of the source organism. The FMO from Prosthecochloris aestuarii 2K has a spectrum of type 1 while that from Chlorobaculum tepidum is of type 2. The previously reported crystal structures for these two proteins did not disclose any rationale that would explain their spectral differences. We have collected a 1.3 A X-ray diffraction dataset of the FMO from Prosthecochloris aestuarii 2K, which has allowed us to identify an additional Bacteriochlorophyll-a molecule with chemical attachments to both sides of the central magnesium atom. A new analysis of the previously published X-ray data for the Chlorobaculum tepidum FMO shows the presence of a Bacteriochlorophyll-a molecule in an equivalent location but with a chemical attachment from only one side. This difference in binding is shown to be predictive of the spectral type of the FMO.

    Related Citations: 
    • The Structure of the Fmo Protein from Chlorobium Tepidum at 2.2 A Resolution
      Camara-Artigas, A., Blankenship, R., Allen, J.P.
      (2003) Photosynth Res 75: 49
    • Crystal Structure of the Bacteriochlorophyll a Protein from Chlorobium Tepidum
      Li, Y.F., Zhou, W.L., Blankenship, R.E., Allen, J.P.
      (1997) J Mol Biol 271: 456
    Organizational Affiliation: 

    Howard Hughes Medical Institute, Institute of Molecular Biology, University of Oregon, Eugene, OR 97403, USA. det101@daletronrud.com



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Bacteriochlorophyll a proteinA,
B [auth C]		365Chlorobaculum tepidumMutation(s): 0 
UniProt
Find proteins for Q46393 (Chlorobaculum tepidum (strain ATCC 49652 / DSM 12025 / NBRC 103806 / TLS))
Explore Q46393 
Go to UniProtKB:  Q46393
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ46393
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.166 
  • Space Group: P 43 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 169.1α = 90
b = 169.1β = 90
c = 169.1γ = 90
Software Package:
Software NamePurpose
PHENIXmodel building
PHASERphasing
BUSTER-TNTrefinement
DENZOdata reduction
SCALEPACKdata scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-05-12
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance