4QL7

Crystal structure of C-terminus truncated Alkylhydroperoxide Reductase subunit C (AhpC1-172) from E. coli


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.75 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.273 
  • R-Value Observed: 0.274 

wwPDB Validation 3D Report Full Report



Literature

Key roles of the Escherichia coli AhpC C-terminus in assembly and catalysis of alkylhydroperoxide reductase, an enzyme essential for the alleviation of oxidative stress

Dip, P.V.Kamariah, N.Nartey, W.Beushausen, C.Kostyuchenko, V.A.Ng, T.S.Lok, S.M.Saw, W.G.Eisenhaber, F.Eisenhaber, B.Gruber, G.

(2014) Biochim Biophys Acta 

  • DOI: 10.1016/j.bbabio.2014.08.007
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • 2-Cys peroxiredoxins (Prxs) are a large family of peroxidases, responsible for antioxidant function and regulation in cell signaling, apoptosis and differentiation. The Escherichia coli alkylhydroperoxide reductase (AhpR) is a prototype of the Prxs-f ...

    2-Cys peroxiredoxins (Prxs) are a large family of peroxidases, responsible for antioxidant function and regulation in cell signaling, apoptosis and differentiation. The Escherichia coli alkylhydroperoxide reductase (AhpR) is a prototype of the Prxs-family, and is composed of an NADH-dependent AhpF reductase (57 kDa) and AhpC (21 kDa), catalyzing the reduction of H2O2. We show that the E. coli AhpC (EcAhpC, 187 residues) forms a decameric ring structure under reduced and close to physiological conditions, composed of five catalytic dimers. Single particle analysis of cryo-electron micrographs of C-terminal truncated (EcAhpC1 -172 and EcAhpC1 -182) and mutated forms of EcAhpC reveals the loss of decamer formation, indicating the importance of the very C-terminus of AhpC in dimer to decamer transition. The crystallographic structures of the truncated EcAhpC1 -172 and EcAhpC1 -182 demonstrate for the first time that, in contrast to the reduced form, the very C-terminus of the oxidized EcAhpC is oriented away from the AhpC dimer interface and away from the catalytic redox-center, reflecting structural rearrangements during redox-modulation and -oligomerization. Furthermore, using an ensemble of different truncated and mutated EcAhpC protein constructs the importance of the very C-terminus in AhpC activity and in AhpC-AhpF assembly has been demonstrated.


    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.
      () To be published --: --

    Organizational Affiliation

    Nanyang Technological University, School of Biological Sciences, 60 Nanyang Drive, Singapore 637551; Bioinformatics Institute, Agency for Science, Technology and Research (A*STAR), 30 Biopolis Street, #07-01 Matrix, Singapore 138671. Electronic address: ggrueber@ntu.edu.sg.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Alkylhydroperoxide Reductase subunit C
A, B, C, D, E
172Escherichia coliMutation(s): 0 
Gene Names: ahpc
EC: 1.8.1 (PDB Primary Data), 1.11.1.15 (PDB Primary Data)
Find proteins for A0A140NC97 (Escherichia coli (strain B / BL21-DE3))
Go to UniProtKB:  A0A140NC97
Protein Feature View
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.75 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.273 
  • R-Value Observed: 0.274 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 137.129α = 90
b = 137.129β = 90
c = 145.27γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
SCALAdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-09-24
    Type: Initial release