PDBsum entry 1lug

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protein ligands metals links
Lyase PDB id
Protein chain
259 a.a. *
GOL ×2
Waters ×338
* Residue conservation analysis
PDB id:
Name: Lyase
Title: Full matrix error analysis of carbonic anhydrase
Structure: Carbonic anhydrase ii. Chain: a. Synonym: carbonate dehydratase ii, ca-ii. Ec:
Source: Homo sapiens. Human. Organism_taxid: 9606
0.95Å     R-factor:   0.119     R-free:   0.141
Authors: E.A.Merritt,I.Le Trong,C.A.Behnke
Key ref: C.A.Behnke et al. (2010). Atomic resolution studies of carbonic anhydrase II. Acta Crystallogr D Biol Crystallogr, 66, 616-627. PubMed id: 20445237
22-May-02     Release date:   09-Sep-03    
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.  - Carbonate dehydratase.
[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   21 terms 
  Biochemical function     protein binding     5 terms  


    Added reference    
Acta Crystallogr D Biol Crystallogr 66:616-627 (2010)
PubMed id: 20445237  
Atomic resolution studies of carbonic anhydrase II.
C.A.Behnke, I.Le Trong, J.W.Godden, E.A.Merritt, D.C.Teller, J.Bajorath, R.E.Stenkamp.
Carbonic anhydrase has been well studied structurally and functionally owing to its importance in respiration. A large number of X-ray crystallographic structures of carbonic anhydrase and its inhibitor complexes have been determined, some at atomic resolution. Structure determination of a sulfonamide-containing inhibitor complex has been carried out and the structure was refined at 0.9 A resolution with anisotropic atomic displacement parameters to an R value of 0.141. The structure is similar to those of other carbonic anhydrase complexes, with the inhibitor providing a fourth nonprotein ligand to the active-site zinc. Comparison of this structure with 13 other atomic resolution (higher than 1.25 A) isomorphous carbonic anhydrase structures provides a view of the structural similarity and variability in a series of crystal structures. At the center of the protein the structures superpose very well. The metal complexes superpose (with only two exceptions) with standard deviations of 0.01 A in some zinc-protein and zinc-ligand bond lengths. In contrast, regions of structural variability are found on the protein surface, possibly owing to flexibility and disorder in the individual structures, differences in the chemical and crystalline environments or the different approaches used by different investigators to model weak or complicated electron-density maps. These findings suggest that care must be taken in interpreting structural details on protein surfaces on the basis of individual X-ray structures, even if atomic resolution data are available.