1I6P

CRYSTAL STRUCTURE OF E. COLI BETA CARBONIC ANHYDRASE (ECCA)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.176 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structure of E. coli beta-carbonic anhydrase, an enzyme with an unusual pH-dependent activity.

Cronk, J.D.Endrizzi, J.A.Cronk, M.R.O'neill, J.W.Zhang, K.Y.

(2001) Protein Sci 10: 911-922

  • DOI: 10.1110/ps.46301
  • Primary Citation of Related Structures:  
    1I6O, 1I6P

  • PubMed Abstract: 
  • Carbonic anhydrases fall into three distinct evolutionary and structural classes: alpha, beta, and gamma. The beta-class carbonic anhydrases (beta-CAs) are widely distributed among higher plants, simple eukaryotes, eubacteria, and archaea. We have determined the crystal structure of ECCA, a beta-CA from Escherichia coli, to a resolution of 2 ...

    Carbonic anhydrases fall into three distinct evolutionary and structural classes: alpha, beta, and gamma. The beta-class carbonic anhydrases (beta-CAs) are widely distributed among higher plants, simple eukaryotes, eubacteria, and archaea. We have determined the crystal structure of ECCA, a beta-CA from Escherichia coli, to a resolution of 2.0 A. In agreement with the structure of the beta-CA from the chloroplast of the red alga Porphyridium purpureum, the active-site zinc in ECCA is tetrahedrally coordinated by the side chains of four conserved residues. These results confirm the observation of a unique pattern of zinc ligation in at least some beta-CAS: The absence of a water molecule in the inner coordination sphere is inconsistent with known mechanisms of CA activity. ECCA activity is highly pH-dependent in the physiological range, and its expression in yeast complements an oxygen-sensitive phenotype displayed by a beta-CA-deletion strain. The structural and biochemical characterizations of ECCA presented here and the comparisons with other beta-CA structures suggest that ECCA can adopt two distinct conformations displaying widely divergent catalytic rates.


    Related Citations: 
    • Cloning, crystallization and preliminary characterization of a beta carbonic anhydrase from Escherichia coli
      Cronk, J.D., O'Neill, J.W., Cronk, M.R., Endrizzi, J.A., Zhang, K.Y.J.
      (2000) Acta Crystallogr D Biol Crystallogr 52: 1176

    Organizational Affiliation

    Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington 98109-1024, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CARBONIC ANHYDRASEA220Escherichia coliMutation(s): 0 
Gene Names: yadF
EC: 4.2.1.1
UniProt
Find proteins for P61517 (Escherichia coli (strain K12))
Explore P61517 
Go to UniProtKB:  P61517
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP61517
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download Ideal Coordinates CCD File 
B [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.176 
  • Space Group: P 42 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.535α = 90
b = 68.535β = 90
c = 85.877γ = 90
Software Package:
Software NamePurpose
EPMRphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-05-09
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance