4CVR

Structure of Apobacterioferritin Y25F variant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.1 Å
  • R-Value Free: 0.165 
  • R-Value Work: 0.134 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

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: 10.1016/j.bbabio.2014.07.019
  • Primary Citation of Related Structures:  

  • 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 mo ...

    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BACTERIOFERRITIN
A
159Escherichia coli (strain K12)Mutation(s): 3 
Gene Names: bfr
EC: 1.16.3.1
Find proteins for P0ABD3 (Escherichia coli (strain K12))
Go to UniProtKB:  P0ABD3
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.1 Å
  • R-Value Free: 0.165 
  • R-Value Work: 0.134 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 104.380α = 90.00
b = 27.950β = 119.37
c = 56.710γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
PHASERphasing
SCALAdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-08-20
    Type: Initial release
  • Version 1.1: 2014-09-10
    Type: Database references