Crystal structure of human carbonic anhydrase XIII and its complex with the inhibitor acetazolamide

Proteins. 2009 Jan;74(1):164-75. doi: 10.1002/prot.22144.

Abstract

The cytosolic isoform XIII is a recently discovered member of the human carbonic anhydrase (hCA, EC 4.2.1.1) family. It is selectively expressed among other tissues in the reproductive organs, where it may control pH and ion balance regulation, ensuring thus proper fertilization conditions. The authors report here the X-ray crystallographic structure of this isozyme in the unbound state and in complex with a classical sulfonamide inhibitor, namely acetazolamide. A detailed comparison of the obtained structural data with those already reported for other CA isozymes provides novel insights into the catalytic properties of the members of this protein family. On the basis of the inhibitory properties of acetazolamide against various cytosolic/transmembrane isoforms and the structural differences detected within the active site of the various CA isoforms, further prospects for the design of isozyme-specific CA inhibitors are here proposed.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetazolamide / chemistry*
  • Acetazolamide / metabolism*
  • Animals
  • Binding Sites
  • Carbonic Anhydrase Inhibitors / chemistry*
  • Carbonic Anhydrase Inhibitors / metabolism*
  • Carbonic Anhydrases / chemistry*
  • Carbonic Anhydrases / isolation & purification
  • Carbonic Anhydrases / metabolism*
  • Crystallography, X-Ray
  • Escherichia coli
  • Escherichia coli Proteins / chemistry
  • Escherichia coli Proteins / isolation & purification
  • Escherichia coli Proteins / metabolism
  • Humans
  • Isoenzymes / chemistry
  • Isoenzymes / metabolism
  • Protein Structure, Tertiary
  • Recombinant Proteins / chemistry
  • Recombinant Proteins / isolation & purification
  • Recombinant Proteins / metabolism

Substances

  • Carbonic Anhydrase Inhibitors
  • Escherichia coli Proteins
  • Isoenzymes
  • Recombinant Proteins
  • CA13 protein, human
  • Carbonic Anhydrases
  • Acetazolamide