3f4x Summary

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Carbonic anhydrase inhibitors. Comparison of chlorthalidone and indapamide X-ray crystal structures in adducts with isozyme II: when three water molecules make the difference

The structure was published by Temperini, C., Cecchi, A., Scozzafava, A., and Supuran, C.T., in 2009 in a paper entitled "Carbonic anhydrase inhibitors. Comparison of chlorthalidone and indapamide X-ray crystal structures in adducts with isozyme II: when three water molecules and the keto-enol tautomerism make the difference." (abstract).

This crystal structure was determined using X-ray diffraction at a resolution of 1.9 Å and deposited in 2008.

The experimental data on which the structure is based was also deposited.

The PDB entry contains the structure of Carbonic anhydrase 2. This molecule has the UniProt identifier P00918 (CAH2_HUMAN)search. The sample contained 260 residues which is 100% of the natural sequence. Out of 260 residues 256 were observed and are deposited in the PDB.

It also contains one or more heterogenic compounds (e.g., ligands, co-factors, ions, modified amino acids, etc.); see here for a complete list.

The molecule is most likely monomeric.

The following tables show cross-reference information to other databases (to obtain a list of all PDB entries sharing the same property or classification, click on the magnifying glass icon):


Chain Name UniProt Name of source organism % of UniProt sequence present in the sample Residues in the sample molecules % of residues observed
A Carbonic anhydrase 2 P00918 (1-260) (CAH2_HUMAN)search Homo sapienssearch 98% 260 98%


This entry contains 1 unique UniProt protein:

UniProt accession Name Organism PDB
P00918 (1 - 260) Carbonic anhydrase 2 Homo sapiens

Chain Structural classification (CATH) Sequence family (Pfam)
A (P00918) Carbonic Anhydrase IIsearch PF00194: Eukaryotic-type carbonic anhydrasesearch

Chain ID Biological process (GO) Cellular component (GO) Molecular function (GO)
A (P00918) one-carbon metabolic processsearch positive regulation of dipeptide transmembrane transportsearch positive regulation of osteoclast differentiationsearch response to steroid hormonesearch angiotensin-activated signaling pathwaysearch positive regulation of cellular pH reductionsearch regulation of intracellular pHsearch small molecule metabolic processsearch response to organic substancesearch bicarbonate transportsearch response to estrogensearch secretionsearch response to pHsearch regulation of chloride transportsearch kidney developmentsearch regulation of anion transportsearch response to zinc ionsearch positive regulation of bone resorptionsearch odontogenesis of dentin-containing toothsearch morphogenesis of an epitheliumsearch positive regulation of synaptic transmission, GABAergicsearch cytoplasmsearch cytosolsearch axonsearch microvillussearch plasma membranesearch apical part of cellsearch extracellular spacesearch myelin sheathsearch extracellular vesicular exosomesearch membranesearch basolateral plasma membranesearch zinc ion bindingsearch carbonate dehydratase activitysearch lyase activitysearch protein bindingsearch metal ion bindingsearch

Chain InterPro annotation
A Alpha carbonic anhydrasesearch Carbonic anhydrase, alpha-class, conserved sitesearch Carbonic anhydrase 2search Carbonic anhydrase, alpha-classsearch