Structure of Apobacterioferritin Y25F variant

Experimental Data Snapshot

  • Resolution: 1.10 Å
  • R-Value Free: 0.165 
  • R-Value Work: 0.134 
  • R-Value Observed: 0.135 

Starting Model: experimental
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Photo-Oxidation of Tyrosine in a Bio-Engineered Bacterioferritin 'Reaction Centre'-A Protein Model for Artificial Photosynthesis.

Hingorani, K.Pace, R.Whitney, S.Murray, J.W.Smith, P.Cheah, M.H.Wydrzynski, T.Hillier, W.

(2014) Biochim Biophys Acta 1837: 1821

  • DOI: https://doi.org/10.1016/j.bbabio.2014.07.019
  • Primary Citation of Related Structures:  
    4CVP, 4CVR, 4CVS, 4CVT

  • PubMed Abstract: 

    The photosynthetic reaction centre (RC) is central to the conversion of solar energy into chemical energy and is a model for bio-mimetic engineering approaches to this end. We describe bio-engineering of a Photosystem II (PSII) RC inspired peptide model, building on our earlier studies. A non-photosynthetic haem containing bacterioferritin (BFR) from Escherichia coli that expresses as a homodimer was used as a protein scaffold, incorporating redox-active cofactors mimicking those of PSII. Desirable properties include: a di-nuclear metal binding site which provides ligands for bivalent metals, a hydrophobic pocket at the dimer interface which can bind a photosensitive porphyrin and presence of tyrosine residues proximal to the bound cofactors, which can be utilised as efficient electron-tunnelling intermediates. Light-induced electron transfer from proximal tyrosine residues to the photo-oxidised ZnCe6(•+), in the modified BFR reconstituted with both ZnCe6 and Mn(II), is presented. Three site-specific tyrosine variants (Y25F, Y58F and Y45F) were made to localise the redox-active tyrosine in the engineered system. The results indicate that: presence of bound Mn(II) is necessary to observe tyrosine oxidation in all BFR variants; Y45 the most important tyrosine as an immediate electron donor to the oxidised ZnCe6(•+) and that Y25 and Y58 are both redox-active in this system, but appear to function interchangebaly. High-resolution (2.1Å) crystal structures of the tyrosine variants show that there are no mutation-induced effects on the overall 3-D structure of the protein. Small effects are observed in the Y45F variant. Here, the BFR-RC represents a protein model for artificial photosynthesis.

  • Organizational Affiliation

    Building 134, Linnaeus Way, Research School of Biology, The Australian National University, ACT 0200, Australia. Electronic address: kastoori.hingorani@anu.edu.au.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
BACTERIOFERRITIN159Escherichia coliMutation(s): 3 
Find proteins for P0ABD3 (Escherichia coli (strain K12))
Explore P0ABD3 
Go to UniProtKB:  P0ABD3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0ABD3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.10 Å
  • R-Value Free: 0.165 
  • R-Value Work: 0.134 
  • R-Value Observed: 0.135 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 104.38α = 90
b = 27.95β = 119.37
c = 56.71γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-08-20
    Type: Initial release
  • Version 1.1: 2014-09-10
    Changes: Database references
  • Version 1.2: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description