The crystal structure of Bcp1 from Sulfolobus Sulfataricus

Experimental Data Snapshot

  • Resolution: 2.15 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.189 

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This is version 1.3 of the entry. See complete history


Insights into the catalytic mechanism of the Bcp family: functional and structural analysis of Bcp1 from Sulfolobus solfataricus

D'Ambrosio, K.Limauro, D.Pedone, E.Galdi, I.Pedone, C.Bartolucci, S.De Simone, G.

(2009) Proteins 76: 995-1006

  • DOI: https://doi.org/10.1002/prot.22408
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Bcps constitute a group of antioxidant enzymes, belonging to the Prx family, that are widely distributed in bacteria, plants, and fungi. These proteins can contain two conserved cysteines within the CXXXXC motif. Recent studies demonstrated that though the role of the first cysteine is well defined, being the catalytic peroxidatic cysteine in all the members of this protein family, data on the function of the second cysteine are controversial and require further investigation. In this article, we report on the functional and structural characterization of Bcp1, an archaeal Bcp isolated from Sulfolobus solfataricus, which presents two conserved cysteine residues at positions 45 and 50. Functional studies revealed that this enzyme performs the catalytic reaction using an atypical 2-Cys mechanism, where Cys45 is the peroxidatic and Cys50 is the resolving cysteine. The X-ray structure of the double mutant C45S/C50S, representative of the fully reduced enzyme state, was determined at a resolution of 2.15 A, showing a Trx fold similar to that of other Prxs. Superposition with a structural homologue in the oxidized state provided, for the first time, a detailed description of the structural rearrangement necessary for a member of the Bcp family to perform the catalytic reaction. From this structural analysis, it emerges that a significant conformational change from a fully folded, to a locally unfolded form is required to form the intramolecular disulfide bond upon oxidation, according to the proposed reaction mechanism. Two residues, namely Arg53 and Asp54, which could play a role in this rearrangement, were also identified.

  • Organizational Affiliation

    Istituto di Biostrutture e Bioimmagini-CNR, via Mezzocannone 16, 80134 Naples, Italy.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Peroxiredoxin, bacterioferritin comigratory protein homolog
A, B
161Saccharolobus solfataricusMutation(s): 2 
Gene Names: bcp-1
Find proteins for Q97WP9 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Explore Q97WP9 
Go to UniProtKB:  Q97WP9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ97WP9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.15 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.189 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.841α = 90
b = 91.829β = 95.74
c = 52.542γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-04-14
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.2: 2021-11-10
    Changes: Database references, Derived calculations
  • Version 1.3: 2023-11-01
    Changes: Data collection, Refinement description