1,4-lactonase

1,4-lactonase
Identifiers
EC number	3.1.1.25
CAS number	37278-38-9
Databases
IntEnz	IntEnz view
BRENDA	BRENDA entry
ExPASy	NiceZyme view
KEGG	KEGG entry
MetaCyc	metabolic pathway
PRIAM	profile
PDB structures	RCSB PDB PDBe PDBsum
Gene Ontology	AmiGO / EGO
Search PMC articles PubMed articles NCBI proteins

In enzymology, a 1,4-lactonase (EC 3.1.1.25) is an enzyme that catalyzes the generic chemical reaction:

a 1,4-lactone + H₂O $\rightleftharpoons$ a 4-hydroxyacid

Thus, the two substrates of this enzyme are 1,4-lactone and H₂O, whereas its product is 4-hydroxyacid.

This enzyme belongs to the family of hydrolases, specifically those acting on carboxylic ester bonds. The systematic name of this enzyme class is 1,4-lactone hydroxyacylhydrolase. This enzyme is also called gamma-lactonase. This enzyme participates in galactose metabolism and ascorbate and aldarate metabolism. It employs one cofactor, calcium.

Structural studies

As of late 2007, three structures have been solved for this class of enzymes, with PDB accession codes 2DG0, 2DG1, and 2DSO.

References

• Fishbein WN, Bessman SP (1966). "Purification and properties of an enzyme in human blood and rat liver microsomes catalyzing the formation and hydrolysis of gamma-lactones. I. Tissue localization, stoichiometry, specificity, distinction from esterase". J. Biol. Chem. 241 (21): 4835–41. PMID 4958984.
• Fishbein WN, Bessman SP (1966). "Purification and properties of an enzyme in human blood and rat liver microsomes catalyzing the formation and hydrolysis of gamma-lactones. II. Metal ion effects, kinetics, and equilibra". J. Biol. Chem. 241 (21): 4842–7. PMID 4958985.