Epoxide Hydrolase

Updated: 2026-09-09

Overview

Epoxide Hydrolase (EH) is a ubiquitous enzyme that catalyzes the hydrolysis of epoxides to their corresponding vicinal diols. This reaction is critical in the detoxification of reactive epoxide intermediates formed during the metabolism of xenobiotics and endogenous compounds. EHs are found in both prokaryotes and eukaryotes, with mammalian forms playing key roles in drug metabolism. The enzyme's ability to regulate epoxide levels makes it pharmacologically significant, particularly in modulating the effects of carcinogenic epoxides and improving drug safety profiles.

Physical and Chemical Properties

Epoxide Hydrolases are typically globular proteins with molecular weights ranging from 45-65 kDa depending on the isoform. They require no cofactors for activity and operate via a catalytic triad mechanism similar to other hydrolases. The enzymes exhibit optimal activity at physiological pH (7.0-7.5) and temperature (37°C for mammalian forms). Their stability varies significantly between sources, with microbial EHs often showing greater thermal stability than mammalian counterparts. Solubility is generally good in aqueous buffers, though some membrane-bound isoforms require detergent for extraction.

Main Applications

In the pharmaceutical industry, EHs are used to produce chiral diols for drug synthesis and to study drug metabolism. Their ability to detoxify harmful epoxides makes them valuable for cancer research and chemoprevention strategies. Industrial applications include bioremediation of epoxide-containing pollutants and biocatalysis for fine chemical production. Microbial EHs are particularly useful in these applications due to their stability and broad substrate range. Recent advances in protein engineering have expanded their utility in asymmetric synthesis.

Safety and Storage

While generally safe to handle, EH preparations should be treated as potential irritants. Use standard laboratory precautions including gloves and eye protection when working with concentrated solutions. For storage, lyophilized powders remain stable for years at -20°C when kept desiccated. Liquid formulations typically contain glycerol or other cryoprotectants and should be aliquoted to avoid repeated freeze-thaw cycles. Activity should be verified after prolonged storage, especially if subjected to temperature fluctuations.

B2B Procurement Guide

When sourcing Epoxide Hydrolase, clearly specify required activity (usually in μmol/min/mg), purity level (electrophoresis grade vs. research grade), and species of origin. Microbial sources (bacterial/yeast) often offer cost advantages for industrial applications. For pharmaceutical use, request detailed documentation including endotoxin levels and absence of protease activity. Consider ordering small test quantities to verify performance with your specific substrate before large-scale purchase. Lead times for custom preparations can be significant, so plan procurement accordingly.