KEGG   ENZYME: 3.1.1.25
Entry
EC 3.1.1.25                 Enzyme                                 
Name
1,4-lactonase;
gamma-lactonase
Class
Hydrolases;
Acting on ester bonds;
Carboxylic-ester hydrolases
Sysname
1,4-lactone hydroxyacylhydrolase
Reaction(IUBMB)
a 1,4-lactone + H2O = a 4-hydroxyacid [RN:R03708]
Reaction(KEGG)
R03708 > R02933 R03034
Substrate
1,4-lactone [CPD:C01770];
H2O [CPD:C00001]
Product
4-hydroxyacid [CPD:C01991]
Comment
The enzyme is specific for 1,4-lactones with 4-8 carbon atoms. It does not hydrolyse simple aliphatic esters, acetylcholine, sugar lactones or substituted aliphatic lactones, e.g. 3-hydroxy-4-butyrolactone; requires Ca2+.
History
EC 3.1.1.25 created 1972, modified 1981
Pathway
ec00052  Galactose metabolism
ec00053  Ascorbate and aldarate metabolism
ec01100  Metabolic pathways
Reference
1  [PMID:4958984]
  Authors
Fishbein WN, Bessman SP.
  Title
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.
  Journal
J Biol Chem 241:4835-41 (1966)
Reference
2  [PMID:4958985]
  Authors
Fishbein WN, Bessman SP.
  Title
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.
  Journal
J Biol Chem 241:4842-7 (1966)
Other DBs
ExplorEnz - The Enzyme Database: 3.1.1.25
IUBMB Enzyme Nomenclature: 3.1.1.25
ExPASy - ENZYME nomenclature database: 3.1.1.25
BRENDA, the Enzyme Database: 3.1.1.25
CAS: 37278-38-9
LinkDB

KEGG   REACTION: R03034
Entry
R03034                      Reaction                               
Name
D-galactono-1,4-lactone hydroxyacylhydrolase
Definition
D-Galactono-1,4-lactone + H2O <=> D-Galactonate
Equation
Reaction class
RC00537  C00880_C03383
Enzyme
Pathway
rn00052  Galactose metabolism
rn01100  Metabolic pathways
Brite
Enzymatic reactions [BR:br08201]
 3. Hydrolase reactions
  3.1  Acting on ester bonds
   3.1.1  Carboxylic-ester hydrolases
    3.1.1.25
     R03034  D-Galactono-1,4-lactone + H2O <=> D-Galactonate
IUBMB reaction hierarchy [BR:br08202]
 3. Hydrolase reactions
  3.1.1.25
   R03708  gamma-Butyrolactone <=> 4-Hydroxyacid
    R03034  D-Galactono-1,4-lactone <=> D-Galactonate
Other DBs
RHEA: 44903
LinkDB

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