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J. Biol. Chem., Vol. 259, Issue 20, 12339-12345, 10, 1984

Leukotriene A4 hydrolase in human leukocytes. Purification and properties

O Radmark, T Shimizu, H Jornvall and B Samuelsson

Leukotriene A4 hydrolase, a soluble enzyme catalyzing hydrolysis of the allylic epoxide leukotriene A4 to the dihydroxy acid leukotriene B4, was purified to apparent homogeneity from human leukocytes. The enzymatic reaction obeyed Michaelis-Menten saturation kinetics with respect to varying concentrations of leukotriene A4. An apparent KM value ranging between 20 and 30 microM was deduced from Eadie-Hofstee plots. Physical properties including molecular weight (68,000-70,000), amino acid composition, and aminoterminal sequence were determined. It was indicated that leukotriene A4 hydrolase is a monomeric protein, distinct from previously described epoxide hydrolases in liver.
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