5B8B

Crystal structure of reduced chimeric E.coli AhpC1-186-YFSKHN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.249 
  • R-Value Observed: 0.250 

wwPDB Validation   3D Report Full Report



Literature

Transition steps in peroxide reduction and a molecular switch for peroxide robustness of prokaryotic peroxiredoxins.

Kamariah, N.Sek, M.F.Eisenhaber, B.Eisenhaber, F.Gruber, G.

(2016) Sci Rep 6: 37610-37610

  • DOI: 10.1038/srep37610
  • Primary Citation of Related Structures:  
    5B8B, 5B8A

  • PubMed Abstract: 
  • In addition to their antioxidant function, the eukaryotic peroxiredoxins (Prxs) facilitate peroxide-mediated signaling by undergoing controlled inactivation by peroxide-driven over-oxidation. In general, the bacterial enzyme lacks this controlled ina ...

    In addition to their antioxidant function, the eukaryotic peroxiredoxins (Prxs) facilitate peroxide-mediated signaling by undergoing controlled inactivation by peroxide-driven over-oxidation. In general, the bacterial enzyme lacks this controlled inactivation mechanism, making it more resistant to high H 2 O 2 concentrations. During peroxide reduction, the active site alternates between reduced, fully folded (FF), and oxidized, locally unfolded (LU) conformations. Here we present novel insights into the divergence of bacterial and human Prxs in robustness and sensitivity to inactivation, respectively. Structural details provide new insights into sub-steps during the catalysis of peroxide reduction, enabling the transition from an FF to a LU conformation. Complementary to mutational and enzymatic results, these data unravel the essential role of the C-terminal tail of bacterial Prxs to act as a molecular switch, mediating the transition from an FF to a LU state. In addition, we propose that the C-terminal tail has influence on the propensity of the disulphide bond formation, indicating that as a consequence on the robustness and sensitivity to over-oxidation. Finally, a physical linkage between the catalytic site, the C-terminal tail and the oligomer interface is described.


    Related Citations: 
    • The ups and downs in AhpF: Structure, mechanism and ensemble formation of the Alkylhydroperoxide Reductase subunits AhpC and AhpF from Escherichia coli
      Dip, P.V., Kamariah, N., Manimekalai, M.S.S., Nartey, W., Balakrishna, A.M., Eisenhaber, F., Eisenhaber, B., Gruber, G.
      (2014) Acta Crystallogr D Struct Biol 70: 2848

    Organizational Affiliation

    School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551, Republic of Singapore.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Alkyl hydroperoxide reductase subunit C,Peroxiredoxin-2ABCDEFGHIJ192Escherichia coli K-12Homo sapiens
This entity is chimeric
Mutation(s): 0 
Gene Names: ahpCb0605JW0598
EC: 1.11.1.15 (PDB Primary Data), 1.11.1.26 (UniProt), 1.11.1.24 (UniProt)
Find proteins for P32119 (Homo sapiens)
Explore P32119 
Go to UniProtKB:  P32119
NIH Common Fund Data Resources
PHAROS  P32119
Find proteins for P0AE08 (Escherichia coli (strain K12))
Explore P0AE08 
Go to UniProtKB:  P0AE08
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.249 
  • R-Value Observed: 0.250 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.494α = 90
b = 135.654β = 111.22
c = 106.489γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-02-01
    Type: Initial release