Hosta

The enzyme 4-pyridoxolactonase (EC 3.1.1.27) catalyzes the reaction

4-pyridoxolactone + H₂O

\rightleftharpoons

4-pyridoxate

This enzyme belongs to the family of hydrolases, specifically those acting on carboxylic ester bonds. The systematic name is 4-pyridoxolactone lactonohydrolase. It participates in vitamin B₆ metabolism.

References

Burg RW, Snell EE (1969). "The bacterial oxidation of vitamin B₆. VI. Pyridoxal dehydrogenase and 4-pyridoxolactonase". J. Biol. Chem. 244 (10): 2585–9. PMID 4306030.

Enzymes
Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Diffusion-limited enzyme Cofactor Enzyme catalysis
Regulation	Allosteric regulation Cooperativity Enzyme inhibitor Enzyme activator
Classification	EC number Enzyme superfamily Enzyme family List of enzymes
Kinetics	Enzyme kinetics Eadie–Hofstee diagram Hanes–Woolf plot Lineweaver–Burk plot Michaelis–Menten kinetics
Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list) EC7 Translocases (list)