Canadian Medical Guide > Chemicals and Drugs > Enzymes and Coenzymes > Enzymes > Hydrolases > Acid Anhydride Hydrolases Terms and Definitions

Acid Anhydride Hydrolases

Medical Definition:	A group of enzymes that catalyze the hydrolysis of diphosphate bonds in compounds such as nucleoside di- and tri-phosphates, and sulfonyl-containing anhydrides such as adenylylsulfate. (Enzyme Nomenclature, 1992) EC 3.6.
CAS Number:	EC 3.6
Previously Indexed:	Hydrolases (1966-1993)

Acid Anhydride Hydrolases Categories.

	Adenosinetriphosphatase - A group of enzymes which catalyze the hydrolysis of ATP coupled with another function such as transporting Ca(2+) across a membrane. These enzymes may be dependent on Ca(2+), Mg(2+), anions, H+, or DNA. EC 3.6.1.3.
	Apyrase - A calcium-activated enzyme that catalyzes the hydrolysis of ATP to yield AMP and orthophosphate. It can also act on ADP and other nucleoside triphosphates and diphosphates. EC 3.6.1.5.
	GTP Phosphohydrolases - Enzymes that hydrolyze GTP to GDP. EC 3.6.1.-.
	Nucleoside-Triphosphatase - An enzyme which catalyzes the hydrolysis of nucleoside triphosphates to nucleoside diphosphates. It may also catalyze the hydrolysis of nucleotide triphosphates, diphosphates, thiamine diphosphates and FAD. The nucleoside triphosphate phosphohydrolases I and II are subtypes of the enzyme which are found mostly in viruses.
	Pyrophosphatases - A group of enzymes within the class EC 3.6.1.- that catalyze the hydrolysis of diphosphate bonds, chiefly in nucleoside di- and triphosphates. They may liberate either a mono- or diphosphate. EC 3.6.1.-.
	Thiamin-Triphosphatase - An enzyme present in nerve tissue. It catalyzes reversibly the formation of thiamine diphosphate and orthophosphate from thiamine triphosphate. EC 3.6.1.28.

Acid Anhydride Hydrolases Medical Definitions and Terms

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