Cited by 1,022Enzyme function and inhibitionChemical Reaction MechanismsEnzyme Structure and Function

Structure and mechanism of carbonic anhydrase

Lindskog, Sven·1997·Pharmacology & Therapeutics

Abstract

Carbonic anhydrase (CA; carbonate hydro-lyase, EC 4.2.1.1) is a zinc-containing enzyme that catalyzes the reversible hydration of carbon dioxide: CO2+ H2O<-->HCO3(-)+H+. The enzyme is the target for drugs, such as acetazolamide, methazolamide, and dichlorphenamide, for the treatment of glaucoma. There are three evolutionarily unrelated CA families, designated alpha, beta, and gamma. All known CAs from the animal kingdom are of the alpha type. There are seven mammalian CA isozymes with different tissue distributions and intracellular locations, CA I-VII. Crystal structures of human CA I and II, bovine CA III, and murine CA V have been determined. All of them have the same tertiary fold, with a central 10-stranded beta-sheet as the dominating secondary structure element. The zinc ion is located in a cone-shaped cavity and coordinated to three histidyl residues and a solvent molecule. Inhibitors bind at or near the metal center guided by a hydrogen-bonded system comprising Glu-106 and Thr-199. The catalytic mechanism of CA II has been studied in particular detail. It involves an attack of zinc-bound OH- on a CO2 molecule loosely bound in a hydrophobic pocket. The resulting zinc-coordinated HCO3- ion is displaced from the metal ion by H2O. The rate-limiting step is an intramolecular proton transfer from the zinc-bound water molecule to His-64, which serves as a proton shuttle between the metal center and buffer molecules in the reaction medium.

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Crossref · 10.1016/s0163-7258(96)00198-2

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  • The affinities of CA for carbon dioxide and bicarbonate are low enough that they are not likely to inhibit reactivity of CA with nitrite.

    “The affinities of CA for carbon dioxide and bicarbonate are low enough that they are not likely to inhibit reactivity of CA with nitrite [103–105].”

    From Mechanisms of nitrite bioactivation (2014) · cites this paper as [104]

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Authors
Lindskog, S.
Affiliations
Umeå University (SE)
Corresponding author
Lindskog, Sven
Venue
Pharmacology & Therapeutics
Publisher
Elsevier BV
Published
1997-01
Volume
74
Issue
1
Pages
1-20
ISSN
0163-7258 (ISSN-L)
OpenAlex
W2035046825
Cited by
1,022
References
212
Citations by year
2026: 38 · 2025: 52 · 2024: 63 · 2023: 50 · 2022: 49 · 2021: 49 · 2020: 34 · 2019: 45 · 2018: 46 · 2017: 38 · 2016: 42 · 2015: 40 · 2014: 41 · 2013: 47 · 2012: 48
FWCI
1.07
Type
journal article
Language
en
Open access
closed
Locations
  • Pharmacology & Therapeutics (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Enzyme function and inhibition
  • Physical Sciences › Chemistry › Organic Chemistry › Chemical Reaction Mechanisms
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
Keywords
carbonic anhydrase, zinc metalloenzyme, CO2 hydration, bicarbonate, catalytic mechanism, isozymes, crystal structure, acetazolamide, carbonic anhydrase inhibitors, glaucoma, proton transfer, histidine residues
MeSH terms
Animals, Carbonic Anhydrases, Catalysis, Humans, Protein Conformation, Structure-Activity Relationship

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