4C3T

The Carbonic anhydrase from Thermovibrio ammonificans reveals an interesting intermolecular disulfide contributing to increasing thermal stability of this enzyme


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.69 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.223 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

The Structure of a Tetrameric [Alpha]-Carbonic Anhydrase from Thermovibrio Ammonificans Reveals a Core Formed Around Intermolecular Disulfides that Contribute to its Thermostability

James, P.Isupov, M.N.Sayer, C.Saneei, V.Berg, S.Lioliou, M.Kotlar, H.Littlechild, J.

(2014) Acta Crystallogr D Biol Crystallogr 70: 2607

  • DOI: https://doi.org/10.1107/S1399004714016526
  • Primary Citation of Related Structures:  
    4C3T, 4COQ, 4UOV

  • PubMed Abstract: 

    Carbonic anhydrase enzymes catalyse the reversible hydration of carbon dioxide to bicarbonate. A thermophilic Thermovibrio ammonificans α-carbonic anhydrase (TaCA) has been expressed in Escherichia coli and structurally and biochemically characterized. The crystal structure of TaCA has been determined in its native form and in two complexes with bound inhibitors. The tetrameric enzyme is stabilized by a unique core in the centre of the molecule formed by two intersubunit disulfides and a single lysine residue from each monomer that is involved in intersubunit ionic interactions. The structure of this core protects the intersubunit disulfides from reduction, whereas the conserved intrasubunit disulfides are not formed in the reducing environment of the E. coli host cytosol. When oxidized to mimic the environment of the periplasmic space, TaCA has increased thermostability, retaining 90% activity after incubation at 70°C for 1 h, making it a good candidate for industrial carbon-dioxide capture. The reduction of all TaCA cysteines resulted in dissociation of the tetrameric molecule into monomers with lower activity and reduced thermostability. Unlike other characterized α-carbonic anhydrases, TaCA does not display esterase activity towards p-nitrophenyl acetate, which appears to result from the increased rigidity of its protein scaffold.


  • Organizational Affiliation

    Henry Wellcome Building for Biocatalysis, Biosciences, College of Life and Environmental Sciences, University of Exeter, Stocker Road, Exeter EX4 4QD, England.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CARBONATE DEHYDRATASE
A, B
247Thermovibrio ammonificansMutation(s): 0 
EC: 4.2.1.1
UniProt
Find proteins for E8T502 (Thermovibrio ammonificans (strain DSM 15698 / JCM 12110 / HB-1))
Explore E8T502 
Go to UniProtKB:  E8T502
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupE8T502
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.69 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.223 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 80.93α = 90
b = 80.93β = 90
c = 154.62γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-09-10
    Type: Initial release
  • Version 1.1: 2014-10-15
    Changes: Database references
  • Version 1.2: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description