BASIC CLASSES OF ENZYMES
Oxidoreductases –
catalyze oxidations or reductions. Examples: dehydrogenases, oxidases, and peroxidases.
Transferases –
catalyze the transfer of a group from one molecule to another. Examples: Phosphatases, transaminases, and transmethylases.
Hydrolases –
catalyze hydrolysis reactions. Examples: digestive enzymes such as sucrase, amylase, maltase, and lactase.
Lyases –
catalyze the removal of groups in non-aqueous media. An example would be the decarboxylases.
Isomerases –
catalyze the isomerization of molecules. Examples: racemases, and cis-trans isomerases.
Ligases
(aka synthetases) - catalyze condensation reactions where smaller molecules are connected with the resulting removal of a water molecule. This is accompanied by the formation of a high energy Phosphate link that stores energy. An example would be the amino acid RNA ligases.
Senin, 27 April 2009
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