Functional characterization of an antennal esterase from the noctuid moth, Spodoptera exigua - PubMed

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• PMID: 24753123
• DOI: 10.1002/arch.21164

Functional characterization of an antennal esterase from the noctuid moth, Spodoptera exigua

Peng He et al. Arch Insect Biochem Physiol. 2014 Jun.

Abstract

Odorant-degrading esterases (ODEs) act in the fast deactivation of ester pheromone components and plant volatiles in insects. However, only few ODEs have been characterised to date. In this study, six full-length putative ODE genes (designated SexiCXE4, 5, 17, 18, 20, and 31) were cloned from the male antennae of Spodoptera exigua. The deduced amino acid sequences possessed typical characteristics of a carboxylesterase (CXE) and shared high identities with reported insect CXEs. The tissue and temporal expression patterns were investigated by quantitative real time PCR. Although all six SexiCXEs are expressed in antennae of both sexes, SexiCXE4, 17 and 20 are antennae-enriched; while SexiCXE5 and SexiCXE18 are dominantly expressed in wings, and SexiCXE31 is mainly expressed in proboscises, heads and legs. With the highly biased expression in antennae and proboscises, SexiCXE4 was selected for further functional assay. The recombinant SexiCXE4 were expressed in High-five cells and purified by a Ni(2+) affinity column. SexiCXE4 has much higher enzyme activity against plant volatiles (Z)-3-hexenyl acetate and hexyl acetate than to the sex pheromone components, suggesting that it may function mostly in the degradation of the plant volatiles.

Keywords: Spodoptera exigua; carboxylesterse; enzyme activity; expression pattern; odorant degrading esterase.

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