5A25

Rational engineering of a mesophilic carbonic anhydrase to an extreme halotolerant biocatalyst


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.153 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Rational Engineering of a Mesohalophilic Carbonic Anhydrase to an Extreme Halotolerant Biocatalyst.

Warden, A.C.Williams, M.Peat, T.S.Seabrook, S.A.Newman, J.Dojchinov, G.Haritos, V.S.

(2015) Nat.Commun. 6: 10278

  • DOI: 10.1038/ncomms10278
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Enzymes expressed by highly salt-tolerant organisms show many modifications compared with salt-affected counterparts including biased amino acid and lower α-helix content, lower solvent accessibility and negative surface charge. Here, we show that ha ...

    Enzymes expressed by highly salt-tolerant organisms show many modifications compared with salt-affected counterparts including biased amino acid and lower α-helix content, lower solvent accessibility and negative surface charge. Here, we show that halotolerance can be generated in an enzyme solely by modifying surface residues. Rational design of carbonic anhydrase II is undertaken in three stages replacing 18 residues in total, crystal structures confirm changes are confined to surface residues. Catalytic activities and thermal unfolding temperatures of the designed enzymes increase at high salt concentrations demonstrating their shift to halotolerance, whereas the opposite response is found in the wild-type enzyme. Molecular dynamics calculations reveal a key role for sodium ions in increasing halotolerant enzyme stability largely through interactions with the highly ordered first Na(+) hydration shell. For the first time, an approach to generate extreme halotolerance, a trait with broad application in industrial biocatalysis, in a wild-type enzyme is demonstrated.


    Organizational Affiliation

    Energy Flagship, Commonwealth Scientific and Industrial Research Organisation (CSIRO), GPO Box 1700, Canberra, Australian Capital Territory 2601, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CARBONIC ANHYDRASE 2
A, B
260Bos taurusMutation(s): 0 
Gene Names: CA2
EC: 4.2.1.1
Find proteins for P00921 (Bos taurus)
Go to Gene View: CA2
Go to UniProtKB:  P00921
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

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Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

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Download CCD File 
A, B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
GOL
Query on GOL

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Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
BOG
Query on BOG

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Download CCD File 
A, B
B-OCTYLGLUCOSIDE
C14 H28 O6
HEGSGKPQLMEBJL-RKQHYHRCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.153 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 59.331α = 90.00
b = 79.440β = 106.98
c = 61.521γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
PHASERphasing
XDSdata reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-05-20
    Type: Initial release
  • Version 1.1: 2016-01-13
    Type: Database references