Biological and Pharmaceutical Bulletin p. 749 - 751 (1997)
Update date:2022-08-22
Topics:
Kayano, Yuichiro
Watanabe, Kazuhito
Matsunaga, Tamihide
Yamamoto, Ikuo
Yoshimura, Hidetoshi
ES46.5K, a novel esterase from mouse hepatic microsomes (Watanabe K., et al., Biochem. Mol. Biol. Int., 31, 25-30 (1993)), catalyzed hydrolysis of phthalate esters. ES46.5K and mouse hepatic microsomes hydrolyzed diethyl-, dibutyl-, diisobutyl-, dioctyl- and diethylhexyl phthalates, whereas dicyclohexyl- and dipbenyl phthalates having ring structure were not hydrolyzed by the enzymes. V(max) (μmol/min/mg protein)/K(m) (μM) ratios of ES46.5K for diethyl-, dibutyl-, diisobutyl-, dioctyl- and diethylhexyl phthalates were 291, 2786, 565, 51 and 57, respectively, while those of microsomes were 0.58, 0.83, 1.71, 0.05 and 1.10, respectively. The hydrolytic activity of ES46.5K was inhibited by diisopropylfluorophosphate and bis-p- nitrophenylphosphate. These results suggest that ES46.5K has high catalytic activity for phthalate esters and some role in the metabolism of phthalate esters in mice.
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