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Open AccessArticle

Molecular Cloning and Characterization of G Alpha Proteins from the Western Tarnished Plant Bug, Lygus hesperus

by J. Joe Hull 1,* and Meixian Wang 1,2
1
USDA-ARS Arid Land Agricultural Center, Maricopa, AZ 85138, USA
2
Key Laboratory of Animal Virology of Ministry of Agriculture, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
*
Author to whom correspondence should be addressed.
Academic Editor: Brian T. Forschler
Insects 2015, 6(1), 54-76; https://doi.org/10.3390/insects6010054
Received: 1 October 2014 / Accepted: 24 December 2014 / Published: 31 December 2014
The Gα subunits of heterotrimeric G proteins play critical roles in the activation of diverse signal transduction cascades. However, the role of these genes in chemosensation remains to be fully elucidated. To initiate a comprehensive survey of signal transduction genes, we used homology-based cloning methods and transcriptome data mining to identity Gα subunits in the western tarnished plant bug (Lygus hesperus Knight). Among the nine sequences identified were single variants of the Gαi, Gαo, Gαs, and Gα12 subfamilies and five alternative splice variants of the Gαq subfamily. Sequence alignment and phylogenetic analyses of the putative L. hesperus Gα subunits support initial classifications and are consistent with established evolutionary relationships. End-point PCR-based profiling of the transcripts indicated head specific expression for LhGαq4, and largely ubiquitous expression, albeit at varying levels, for the other LhGα transcripts. All subfamilies were amplified from L. hesperus chemosensory tissues, suggesting potential roles in olfaction and/or gustation. Immunohistochemical staining of cultured insect cells transiently expressing recombinant His-tagged LhGαi, LhGαs, and LhGαq1 revealed plasma membrane targeting, suggesting the respective sequences encode functional G protein subunits. View Full-Text
Keywords: Lygus hesperus; plant bug; heterotrimeric G protein; signal transduction; Gα subunit; gene cloning; expression profile Lygus hesperus; plant bug; heterotrimeric G protein; signal transduction; Gα subunit; gene cloning; expression profile
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Hull, J.J.; Wang, M. Molecular Cloning and Characterization of G Alpha Proteins from the Western Tarnished Plant Bug, Lygus hesperus. Insects 2015, 6, 54-76.

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