Purification and characterization of an esterase from larval Diplolepis fructuum (Rübsaamen, 1895) (Hymenoptera: Cynipidae)
Abstract
Diplolepis fructuum (Rübsaamen, 1895) (Hymenoptera: Cynipidae) is one of the important insect species that causes damages on Rosaceae species. With this study commenced in 2018 at the laboratory of Department of Biochemistry, Faculty of Science, Cumhuriyet University to get a biochemical data, an esterase (EC 3.1.1.X) from the larvae of D. fructuum was purified using Q Sepharose anion exchange, phenyl Sepharose CL-4B and Sephacryl S100 HR gel filtration chromatography, respectively. The enzyme had 6.94 U/mg protein specific activity, about 29-fold purity, and 8.8% yield. Only one activity band was observed in native-PAGE studies. The molecular weight of the esterase was estimated as 60 kDa using native-PAGE and SDS-PAGE techniques. By the kinetic data, optimum temperature and pH for the enzyme was determined as 40ºC and 9.0, respectively. The enzyme was stable for 4 h at 40ºC and pH 8.0. Km and Vmax values were found to be 0.035 mM and 1.41 µmol/mL.min., using 4-nitrophenyl butyrate (p-NPB) as substrate. The enzyme exhibited its highest activities on p-NPB (100%) and 4-nitrophenyl acetate (52%). All of these data indicate that the enzyme might be a typical esterase with different kinetic properties and molecular weight than esterolytic enzymes reported from other insect species.
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Details
Primary Language
English
Subjects
-
Journal Section
Research Article
Authors
Mazen Althaljı
This is me
0000-0002-1143-239X
Türkiye
Salih Görgün
*
0000-0002-2121-2577
Türkiye
Publication Date
December 1, 2019
Submission Date
February 28, 2019
Acceptance Date
July 8, 2019
Published in Issue
Year 2019 Volume: 43 Number: 4