Crystal Structure of the C45S mutant of the Peroxiredoxin 6 of Arenicola Marina. Monoclinic form

Experimental Data Snapshot

  • Resolution: 1.60 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.162 

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The Crystal Structure of the C45S Mutant of Annelid Arenicola Marina Peroxiredoxin 6 Supports its Assignment to the Mechanistically Typical 2- Cys Subfamily without Any Formation of Toroid- Shaped Decamers.

Smeets, A.Loumaye, E.Clippe, A.Rees, J.F.Knoops, B.Declercq, J.P.

(2008) Protein Sci 17: 700

  • DOI: https://doi.org/10.1110/ps.073399308
  • Primary Citation of Related Structures:  
    2V2G, 2V32, 2V41

  • PubMed Abstract: 

    The peroxiredoxins (PRDXs) define a superfamily of thiol-dependent peroxidases able to reduce hydrogen peroxide, alkyl hydroperoxides, and peroxynitrite. Besides their cytoprotective antioxidant function, PRDXs have been implicated in redox signaling and chaperone activity, the latter depending on the formation of decameric high-molecular-weight structures. PRDXs have been mechanistically divided into three major subfamilies, namely typical 2-Cys, atypical 2-Cys, and 1-Cys PRDXs, based on the number and position of cysteines involved in the catalysis. We report the structure of the C45S mutant of annelid worm Arenicola marina PRDX6 in three different crystal forms determined at 1.6, 2.0, and 2.4 A resolution. Although A. marina PRDX6 was cloned during the search of annelid homologs of mammalian 1-Cys PRDX6s, the crystal structures support its assignment to the mechanistically typical 2-Cys PRDX subfamily. The protein is composed of two distinct domains: a C-terminal domain and an N-terminal domain exhibiting a thioredoxin fold. The subunits are associated in dimers compatible with the formation of intersubunit disulfide bonds between the peroxidatic and the resolving cysteine residues in the wild-type enzyme. The packing of two crystal forms is very similar, with pairs of dimers associated as tetramers. The toroid-shaped decamers formed by dimer association and observed in most typical 2-Cys PRDXs is not present. Thus, A. marina PRDX6 presents structural features of typical 2-Cys PRDXs without any formation of toroid-shaped decamers, suggesting that it should function more like a cytoprotective antioxidant enzyme or a modulator of peroxide-dependent cell signaling rather than a molecular chaperone.

  • Organizational Affiliation

    Unit of Structural Chemistry (CSTR), Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
233Arenicola marinaMutation(s): 1 
Find proteins for Q1AN22 (Arenicola marina)
Explore Q1AN22 
Go to UniProtKB:  Q1AN22
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ1AN22
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.60 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.162 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 127.246α = 90
b = 83.226β = 100.71
c = 98.349γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-04-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Refinement description, Version format compliance
  • Version 1.2: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description