Thermostabilized mutant of human carbonic anhydrase II - A65T L100H K154N L224S L240P A248T

Experimental Data Snapshot

  • Resolution: 0.90 Å
  • R-Value Free: 0.144 
  • R-Value Work: 0.120 
  • R-Value Observed: 0.121 

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


Structural insights into a thermostable variant of human carbonic anhydrase II.

Kean, K.M.Porter, J.J.Mehl, R.A.Karplus, P.A.

(2018) Protein Sci 27: 573-577

  • DOI: https://doi.org/10.1002/pro.3347
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Carbonic anhydrase is an enzyme of interest for many biotechnological developments including carbon sequestration. These applications often require harsh conditions, so there is a need for the development of thermostable variants. One of the most thermostable human carbonic anhydrase II (HCAIIts) variants was patented in 2006. Here, we report the ultra-high resolution crystal structure of HCAIIts. The structural changes seen are consistent with each of the six mutations involved acting largely independently and variously resulting in increased H-bonding, improved packing, and reduced side chain entropy loss on folding to yield the increased stability. We further suggest that for four of the mutations, improvements in backbone conformational energetics is also a contributor and that considerations of such conformational propensities of individual amino acids are often overlooked.

  • Organizational Affiliation

    Department of Biochemistry and Biophysics, 2011 Agriculture and Life Sciences Building, Oregon State University, Corvallis, Oregon, 97331.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Carbonic anhydrase 2266Homo sapiensMutation(s): 6 
Gene Names: CA2
UniProt & NIH Common Fund Data Resources
Find proteins for P00918 (Homo sapiens)
Explore P00918 
Go to UniProtKB:  P00918
GTEx:  ENSG00000104267 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00918
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 0.90 Å
  • R-Value Free: 0.144 
  • R-Value Work: 0.120 
  • R-Value Observed: 0.121 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.62α = 90
b = 43.76β = 100.72
c = 57.99γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-12-13
    Type: Initial release
  • Version 1.1: 2018-01-31
    Changes: Database references
  • Version 1.2: 2023-10-04
    Changes: Data collection, Database references, Refinement description