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C4396 Sigma

Carbonic Anhydrase I from human erythrocytes

Synonym: Carbonate Dehydratase, Carbonate Hydrolyase, Carbonic Anhydrase Isozyme I



Preparation Note


Unit Definition

One Wilbur-Anderson (W-A) unit will cause the pH of a 0.02 M Trizma buffer to drop from 8.3 to 6.3 per min at 0 °C. (One W-A unit is essentially equivalent to one Roughton-Booth unit.)


Carbonic anhydrase from human erythrocytes (HCA) has been used to study the molten-globule state of carbonic anhydrase (CA). Chaperone-like α-crystallin binds to this state of the enzyme and prevents its aggregation. The enzyme from sigma has been used for the analysis of thermodynamic stability of the enzyme. Furthermore, its clinical significance has been evaluated in human non-small cell lung cancer.

Biochem/physiol Actions

Carbonic anhydrase is a zinc metalloenzyme that has a molecular weight of approximately 30,000 Da. The enzyme catalyzes the hydration of carbon dioxide to carbonic acid. It is involved in vital processes such as pH and CO2 homeostasis, transport of bicarbonate and CO2, biosynthetic reactions, bone resorption, calcification, and tumorigenicity. Therefore, this enzyme is an important target for inhibitors with clinical applications in various pathologies such as glaucoma, epilepsy and Parkinson’s disease.

Price and Availability

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 
Protocols & Articles


Cellular Derived Blood Proteins and Enzymes

Cell damage is induced by reactive oxygen species (ROS). ROS are either free radicals, reactive anions containing oxygen atoms, or molecules containing oxygen atoms that can either produce free radic...
BioFiles 2006, 1.5, 4.
Keywords: Aerobic, Alzheimer Disease, Bacterial conjugations, Biofiles, Cancer, Metabolism, Oxidations, Parkinson Disease, Reductions, Respiration


Enzymatic Assay of Carbonic Anhydrase for Wilbur-Anderson Units (EC

To standardize a procedure for the enzymatic assay of Carbonic Anhydrase (EC for Wilbur-Anderson Units.
Keywords: Hydration reaction, Phase transitions

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Enzymes & Proteins

Application Index | Enzyme Index | Substrate Index | Inhibitor Index | Cofactor Index | Lectin Index
Keywords: Cell signaling, Diagnostic, Drug discovery, Molecular biology

Peer-Reviewed Papers


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