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1 May 2000 Midgut Proteinase Types and Sodium Tetraborate Effects on Midgut Proteinase Activities of Female Anastrepha suspensa (Diptera: Tephritidae)
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Abstract

Trypsin-like, chymotrypsin-like, aminopeptidase and carboxypeptidase A and B were detected in the midgut of adult female Anastrepha suspensa (Loew). Based on specific substrates and inhibitors, endoproteinases were demonstrated to be serine proteinases in which trypsin-like enzyme seemed to be the major digestive enzyme. These proteinases had alkaline pH optima, pH 7.5–9. All determined proteinase activities in the midgut were reduced to different degrees in the first few days after newly emerged flies were treated for 24 h with 0.2 and 0.5% sodium tetraborate. The 0.5% concentration caused greater reductions. These reductions in proteinase activities were not the result of direct enzyme inhibition.

L. K. Yang, H. N. Nigg, S. Fraser, E. Burns, and S. E. Simpson "Midgut Proteinase Types and Sodium Tetraborate Effects on Midgut Proteinase Activities of Female Anastrepha suspensa (Diptera: Tephritidae)," Annals of the Entomological Society of America 93(3), (1 May 2000). https://doi.org/10.1603/0013-8746(2000)093[0602:MPTAST]2.0.CO;2
Received: 11 May 1999; Accepted: 1 October 1999; Published: 1 May 2000
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