Activity of Leucine Aminopeptidase of Telchin licus licus: An Important Insect Pest of Sugarcane
| Autor: | Maria Fatima Grossi de Sa, Arnubio Valencia Jimenez, Jorge Valencia |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
chemistry.chemical_classification
Substrate (chemistry) General Medicine Naphthalenes Biology biology.organism_classification Biochemistry Aminopeptidase Saccharum Substrate Specificity Lepidoptera Insect pest Kinetics Leucyl Aminopeptidase Hydrolysis Enzyme chemistry Leucine Structural Biology Telchin licus Animals Spectrophotometric measurement Enzyme Assays |
| Zdroj: | Protein & Peptide Letters. 21:535-541 |
| ISSN: | 0929-8665 |
| Popis: | The enzymatic activity of leucine aminopeptidase (EC 3.4.11.1) from the intestinal tract of sugarcane giant borer (Telchin licus licus) was assayed by using a simple and sensitive spectrophotometric assay that uses L-leucyl-2- naphthylamide as substrate. In this assay, L-leucyl-2-naphthylamide is hydrolyzed to produce 2-naphthylamine and Lleucine. The product 2-naphthylamine reacts with Fast Black K and can be monitored using a continuous spectrophotometric measurement at 590 nm. The data on the kinetic parameters indicates that the Km for the L-leucyl-2- naphthylamide at pH 7.0 was found to be lower than those found for other LAP substrates. The Km and Vmax for the LAP were determined to be 84.03 µM and 357.14 enzymatic units mg(-1), respectively. A noticeable difference of LAP activity between the two insect orders tested was observed. This method could be used to screen for natural LAP inhibitors. |
| Databáze: | OpenAIRE |
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