Pyrophosphatases, also known as diphosphatases, are
acid anhydride hydrolases that act upon
diphosphate
In chemistry, pyrophosphates are phosphorus oxyanions that contain two phosphorus atoms in a P–O–P linkage. A number of pyrophosphate salts exist, such as disodium pyrophosphate (Na2H2P2O7) and tetrasodium pyrophosphate (Na4P2O7), among other ...
bonds.
Examples include:
*
Inorganic pyrophosphatase
Inorganic pyrophosphatase (or inorganic diphosphatase, PPase) is an enzyme () that catalyzes the conversion of one ion of pyrophosphate to two phosphate ions. This is a highly exergonic reaction, and therefore can be coupled to unfavorable bio ...
, which acts upon the free pyrophosphate ion
*
Tobacco acid pyrophosphatase, which catalyses the hydrolysis of a
phosphoric ester
In chemistry, an ester is a compound derived from an oxoacid (organic or inorganic) in which at least one hydroxyl group () is replaced by an alkoxy group (), as in the substitution reaction of a carboxylic acid and an alcohol. Glycerides are ...
* Various organic pyrophosphatases, which act upon organic molecules with the pyrophosphate group (but excluding triphosphatases that act on the final bond):
**
Thiamine pyrophosphatase
See also
*
References
External links
*
EC 3.6.1
{{3.6-enzyme-stub