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Biosci Biotechnol Biochem. 2000 Aug;64(8):1681-7.

Characterization and affinity purification of juvenile hormone esterase from Bombyx mori.

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1
Department of Insect Physiology and Behavior, National Institute of Sericultural and Entomological Science, Tsukuba, Ibaraki, Japan. shiotsuk@nises.affrc.go.jp

Abstract

Juvenile hormone esterase (JHE) from hemolymph of the silkworm moth Bombyx mori was characterized for substrate specificity and inhibitor sensitivity. B. mori JHE hydrolyzed the juvenile hormone surrogate substrate methyl n-heptylthioacetothioate (HEPTAT) more efficiently than p-nitrophenyl acetate and 1-naphthyl acetate substrates widely used to assay total carboxylesterase activity. B. mori JHE was sensitive to 3-octylthio-1,1,1-trifluoro-2-propanone (OTFP), which was developed as a selective inhibitor for lepidopteran JHE, and relatively insensitive to diisopropyl fluorophosphate (DFP), an inhibitor of serine esterases but not of all JHEs. Affinity purification with a trifluoromethyl ketone ligand was more efficient for purification of B. mori JHE than DEAE ion exchange chromatography.

PMID:
10993156
[Indexed for MEDLINE]
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