Eur. J. Entomol. 102 (2): 147-153, 2005 | DOI: 10.14411/eje.2005.023
Trypsin-like activity of membrane-bound midgut proteases from Anticarsia gemmatalis (Lepidoptera: Noctuidae)
- 1 Departament of Biochemistry and Molecular Biology, Institute of Biotechnology Applied to Agriculture and Animal Science (BIOAGRO), Federal University of Viçosa, Viçosa, MG 36571-000, Brazil
- 2 Departament of Animal Biology, Federal University of Viçosa, Viçosa, MG 36571-000, Brazil
- 3 Departament of Microbiology, Institute of Biotechnology Applied to Agriculture and Animal Science (BIOAGRO), Federal University of Viçosa, Viçosa, MG 36571-000, Brazil
- 4 Departament of Biochemistry and Molecular Biology, Foundation Oswaldo Cruz Institute (FIOCRUZ), Rio de Janeiro, RJ 21045-900, Brazil
Membrane-bound proteases from preparations of the midgut of 5th instar velvetbean caterpillars, Anticarsia gemmatalis (Hübner) were obtained by resuspension of the pellet obtained after 100,000 g centrifugation. As expected of trypsin-like proteases, they hydrolyzed casein and the synthetic substrates N-α-benzoyl-L-Arg-p-nitroanilidine (L-BApNA) and N-α-p-tosyl-L-Arg methyl ester (L-TAME). Higher activities were observed at 50°C, and at pH 8.5 and 8.0 for both synthetic substrates L-BApNA and L-TAME. The membrane-bound proteases were inhibited by EDTA, phenylmethan sulphonyl fluoride (PMSF), tosyl-L-lysine chloromethyl ketone (TLCK), benzamidine and aprotinin. TLCK and benzamidine were particularly active inhibitors. The KM-values obtained were 0.23 mM for L-BApNA and 92.5 µM for L-TAME. These results provide evidence for the presence of membrane-bound trypsin-like proteases in the midgut of the velvetbean caterpillar, a key soybean pest in warm climates. The interaction between A. gemmatalis digestive proteases and soybean protease inhibitors has potentially important consequences for soybean breeding programs.
Keywords: Trypsin, proteases, velvetbean caterpillar, Lepidoptera, Noctuidae, Anticarsia
Received: July 1, 2004; Revised: November 29, 2004; Accepted: November 29, 2004; Published: May 3, 2005 Show citation
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