4COQ

The complex of alpha-Carbonic anhydrase from Thermovibrio ammonificans with inhibitor sulfanilamide.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.177 

wwPDB Validation 3D Report Full Report



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: 10.1107/S1399004714016526
  • Structures With Same Primary Citation

  • 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 characterize ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CARBONATE DEHYDRATASEA, B247Thermovibrio ammonificans HB-1Mutation(s): 0 
Gene Names: Theam_1576
EC: 4.2.1.1
Find proteins for E8T502 (Thermovibrio ammonificans (strain DSM 15698 / JCM 12110 / HB-1))
Explore E8T502 
Go to UniProtKB:  E8T502
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PG6
Query on PG6

Download CCD File 
A, B
1-(2-METHOXY-ETHOXY)-2-{2-[2-(2-METHOXY-ETHOXY]-ETHOXY}-ETHANE
C12 H26 O6
DMDPGPKXQDIQQG-UHFFFAOYSA-N
 Ligand Interaction
PG4
Query on PG4

Download CCD File 
A
TETRAETHYLENE GLYCOL
C8 H18 O5
UWHCKJMYHZGTIT-UHFFFAOYSA-N
 Ligand Interaction
SAN
Query on SAN

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A, B
SULFANILAMIDE
C6 H8 N2 O2 S
FDDDEECHVMSUSB-UHFFFAOYSA-N
 Ligand Interaction
PGE
Query on PGE

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A, B
TRIETHYLENE GLYCOL
C6 H14 O4
ZIBGPFATKBEMQZ-UHFFFAOYSA-N
 Ligand Interaction
ZN
Query on ZN

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A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

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B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.177 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.05α = 90
b = 115.36β = 90
c = 65.54γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling
MOLREPphasing
BALBESphasing
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-10-15
    Type: Initial release