1CA2

REFINED STRUCTURE OF HUMAN CARBONIC ANHYDRASE II AT 2.0 ANGSTROMS RESOLUTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Refined structure of human carbonic anhydrase II at 2.0 A resolution.

Eriksson, A.E.Jones, T.A.Liljas, A.

(1988) Proteins 4: 274-282

  • DOI: 10.1002/prot.340040406
  • Primary Citation of Related Structures:  
  • Also Cited By: 3T5Z, 3T5U, 3CZV, 3BET, 2HOC, 2HL4, 2HD6

  • PubMed Abstract: 
  • The structure of human erythrocytic carbonic anhydrase II has been refined by constrained and restrained structure-factor least-squares refinement at 2.0 A resolution. The conventional crystallographic R value is 17.3%. Of 167 solvent molecules assoc ...

    The structure of human erythrocytic carbonic anhydrase II has been refined by constrained and restrained structure-factor least-squares refinement at 2.0 A resolution. The conventional crystallographic R value is 17.3%. Of 167 solvent molecules associated with the protein, four are buried and stabilize secondary structure elements. The zinc ion is ligated to three histidyl residues and one water molecule in a nearly tetrahedral geometry. In addition to the zinc-bound water, seven more water molecules are identified in the active site. Assuming that Glu-106 is deprotonated at pH 8.5, some of the hydrogen bond donor-acceptor relations in the active site can be assigned and are described here in detail. The O gamma 1 atom of Thr-199 donates its proton to the O epsilon 1 atom of Glu-106 and can function as a hydrogen bond acceptor only in additional hydrogen bonds.


    Related Citations: 
    • Crystal Structure of Human Carbonic Anhydrase C
      Liljas, A.,Kannan, K.K.,Bergsten, P.-C.,Waara, I.,Fridborg, K.,Strandberg, B.,Carlbom, U.,Jarup, L.,Lovgren, S.,Petef, M.
      (1972) Nature New Biol. 235: 131
    • Crystal Structure of Human Erythrocyte Carbonic Anhydrase C. Vi. The Three-Dimensional Structure at High Resolution in Relation to Other Mammalian Carbonic Anhydrases
      Kannan, K.K.,Liljas, A.,Waara, I.,Bergsten, P.-C.,Lovgren, S.,Strandberg, B.,Bengtsson, U.,Carlbom, U.,Fridborg, K.,Jarup, L.,Petef, M.
      (1972) Cold Spring Harbor Symp.Quant.Biol. 36: 221
    • Crystallographic Studies of Inhibitor Binding Sites in Human Carbonic Anhydrase II. A Pentacoordinated Binding of the Scn-Ion to the Zinc at High Ph
      Eriksson, A.E.,Kylsten, P.M.,Jones, T.A.,Liljas, A.
      (1988) Proteins 4: 283
    • Structural Relationship of Human Erythrocyte Carbonic Anhydrase Isozymes B and C
      Notstrand, B.,Vaara, I.,Kannan, K.K.
      (1975) Isozymes-Molecular Structure 1: 575


    Organizational Affiliation

    Department of Molecular Biology, Biomedical Center, Uppsala, Sweden.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CARBONIC ANHYDRASE II
A
259Homo sapiensGene Names: CA2
EC: 4.2.1.1
Find proteins for P00918 (Homo sapiens)
Go to Gene View: CA2
Go to UniProtKB:  P00918
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 42.700α = 90.00
b = 41.700β = 104.60
c = 73.000γ = 90.00
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1990-01-15
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other