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Journal
2008 | 56 | 1-2 | 103-110
Article title

Partial characterization of a lipase from gypsy moth (Lymantria dispar L.) larval midgut

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EN
Abstracts
EN
Lipase activity of the gypsy moth (Lymantria dispar L.) was studied by the spectrophotometric method using crude homogenate of fifth-instar larval midgut tissues as the enzyme source and p-nitrophenyl caprylate (pNPC) as substrate. A Km value of 0.310mM and a Vmax value of 1.479U/mg prot. were obtained for this substrate. Among various p-nitrophenyl esters tested, maximum activity was obtained for p-nitrophenyl caprylate and p-nitrophenyl caprate. The enzyme was most active at alkaline pH, with maximum at pH 8.2. Decreased activity was detected after preincubation in buffers of pH below 7.0 and above 8.2. The enzyme was unstable at room temperature. The enzyme was Ca2+ independent. Its activity was inhibited by PMSF, Fe2+, Ag+ and Pb2+, while Fe3+ inhibited enzyme activity by about 40%.
References
Document Type
ARTICLE
Publication order reference
Marija Mrdakovic, Institute for Biological Research, Despot Stefan Blvd. 142, 11000 Belgrade, Serbia
YADDA identifier
bwmeta1.element.element-from-psjc-8121add9-4b85-3d0a-b7ec-45c86452e493
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