PDBsum entry 1cra

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Lyase(oxo-acid) PDB id
Jmol PyMol
Protein chain
260 a.a. *
Waters ×225
* Residue conservation analysis
PDB id:
Name: Lyase(oxo-acid)
Title: The complex between human carbonic anhydrase ii and the aromatic inhibitor 1,2,4-triazole
Structure: Carbonic anhydrase ii. Chain: a. Engineered: yes
Source: Homo sapiens. Human. Organism_taxid: 9606
1.90Å     R-factor:   0.153    
Authors: S.Mangani,A.Liljas
Key ref: S.Mangani and A.Liljas (1993). Crystal structure of the complex between human carbonic anhydrase II and the aromatic inhibitor 1,2,4-triazole. J Mol Biol, 232, 9. PubMed id: 8331673
21-Oct-92     Release date:   31-Jan-94    
Go to PROCHECK summary

Protein chain
Pfam   ArchSchema ?
P00918  (CAH2_HUMAN) -  Carbonic anhydrase 2
260 a.a.
259 a.a.
Key:    PfamA domain  Secondary structure  CATH domain

 Enzyme reactions 
   Enzyme class: E.C.  - Carbonic anhydrase.
[IntEnz]   [ExPASy]   [KEGG]   [BRENDA]
      Reaction: H2CO3 = CO2 + H2O
= CO(2)
+ H(2)O
      Cofactor: Zn(2+)
Molecule diagrams generated from .mol files obtained from the KEGG ftp site
 Gene Ontology (GO) functional annotation 
  GO annot!
  Cellular component     extracellular space   11 terms 
  Biological process     angiotensin-mediated signaling pathway   22 terms 
  Biochemical function     protein binding     6 terms  


    Added reference    
J Mol Biol 232:9 (1993)
PubMed id: 8331673  
Crystal structure of the complex between human carbonic anhydrase II and the aromatic inhibitor 1,2,4-triazole.
S.Mangani, A.Liljas.
The X-ray crystal structure of the complex between human carbonic anhydrase II and the inhibitor 1,2,4-triazole has been refined at 1.9 A resolution to a final R-factor of 0.153. Triazole is an analogue of the competitive inhibitor imidazole, but the crystal structure shows a different type of binding to the enzyme. 1,2,4-Triazole is directly bound to the zinc(II) ion through the nitrogen in position 4, replacing the native water/hydroxyl (Wat263) in a distorted four-co-ordinated complex. The interaction of the inhibitor with the active site is completed by two hydrogen bonds to O gamma of Thr200 and to the amide nitrogen atom of Thr199 through the two adjacent N-1 and N-2 atoms. The binding site of triazole overlaps the proposed binding sites for the substrates, explaining the observed competitive behaviour of the inhibitor towards CO2/HCO3- under equilibrium conditions.

Literature references that cite this PDB file's key reference

  PubMed id Reference
20931644 A.Casini, C.Temperini, C.Gabbiani, C.T.Supuran, and L.Messori (2010).
The x-ray structure of the adduct between NAMI-A and carbonic anhydrase provides insights into the reactivity of this metallodrug with proteins.
  ChemMedChem, 5, 1989-1994.
PDB code: 3m1j
18335973 V.M.Krishnamurthy, G.K.Kaufman, A.R.Urbach, I.Gitlin, K.L.Gudiksen, D.B.Weibel, and G.M.Whitesides (2008).
Carbonic anhydrase as a model for biophysical and physical-organic studies of proteins and protein-ligand binding.
  Chem Rev, 108, 946.  
11732994 D.Röther, L.Poppe, S.Viergutz, B.Langer, and J.Rétey (2001).
Characterization of the active site of histidine ammonia-lyase from Pseudomonas putida.
  Eur J Biochem, 268, 6011-6019.  
9265618 F.Briganti, S.Mangani, P.Orioli, A.Scozzafava, G.Vernaglione, and C.T.Supuran (1997).
Carbonic anhydrase activators: X-ray crystallographic and spectroscopic investigations for the interaction of isozymes I and II with histamine.
  Biochemistry, 36, 10384-10392.
PDB code: 1avn
9336012 S.Lindskog (1997).
Structure and mechanism of carbonic anhydrase.
  Pharmacol Ther, 74, 1.  
8306976 A.Liljas, K.Håkansson, B.H.Jonsson, and Y.Xue (1994).
Inhibition and catalysis of carbonic anhydrase. Recent crystallographic analyses.
  Eur J Biochem, 219, 1.  
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