|Superclasses:||Reactions Classified By Conversion Type → Simple Reactions → Chemical Reactions|
|Reactions Classified By Substrate → Small-Molecule Reactions|
EC Number: 18.104.22.168
Enzymes and Genes:
|Escherichia coli K-12 substr. MG1655 :||D-galactono-γ-lactonase
|Sinorhizobium meliloti :||lactonase
In Pathway: galactose degradation II
Note that this reaction equation differs from the official Enzyme Commission reaction equation for this EC number, which can be found here .
The reaction direction shown, that is, A + B ↔ C + D versus C + D ↔ A + B, is in accordance with the direction in which it was curated.
Most BioCyc compounds have been protonated to a reference pH value of 7.3, and some reactions have been computationally balanced for hydrogen by adding free protons. Please see the PGDB Concepts Guide for more information.
Mass balance status: Balanced.
Enzyme Commission Primary Name: 1,4-lactonase
Enzyme Commission Synonyms: γ-lactonase
Standard Gibbs Free Energy (ΔrG'° in kcal/mol): -6.347122 [Latendresse13]
Enzyme Commission Summary:
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+.
Unification Links: KEGG:R03034
Fishbein66: 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
Fishbein66a: 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
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