1. Purification and Characterization of Trehalase From Acyrthosiphon pisum, a Target for Pest Control
- Author
-
Eric A. Perpète, Frédéric Francis, Catherine Michaux, André Matagne, Virgile Neyman, and Marc Dieu
- Subjects
Bioengineering ,Insect Control ,Biochemistry ,Analytical Chemistry ,Pisum ,chemistry.chemical_compound ,Affinity chromatography ,Animals ,Ammonium ,Glycoside hydrolase ,Catalytic and structural properties ,Trehalase ,Phylogeny ,Multiple sequence alignment ,biology ,Chemistry ,Organic Chemistry ,Acyrthosiphon pisum ,biology.organism_classification ,Enzyme assay ,Aphids ,biology.protein ,Insect Proteins ,Molecular modelling - Abstract
Insect trehalases are glycoside hydrolases essential for trehalose metabolism and stress resistance. We here report the extraction and purification of Acyrthosiphon pisum soluble trehalase (ApTreh-1), its biochemical and structural characterization, as well as the determination of its kinetic properties. The protein has been purified by ammonium sulphate precipitation, first followed by an anion-exchange and then by an affinity chromatography. The SDS-PAGE shows a main band at 70 kDa containing two isoforms of ApTreh-1 (X1 and X2), identified by mass spectrometry and slightly contrasting in the C-terminal region. A phylogenetic tree, a multiple sequence alignment, as well as a modelled 3D-structure were constructed and they all reveal the ApTreh-1 similarity to other insect trehalases, i.e. the two signature motifs 179PGGRFRELYYWDTY192 and 479QWDFPNAWPP489, a glycine-rich region 549GGGGEY554, and the catalytic residues Asp336 and Glu538. The optimum enzyme activity occurs at 45 °C and pH 5.0, with Km and Vmax values of ~ 71 mM and ~ 126 µmol/min/mg, respectively. The present structural and functional characterization of soluble A. pisum trehalase enters the development of new strategies to control the aphids pest without significant risk for non-target organisms and human health.
- Published
- 2021