Gibson Assembly: an Easy Way to Clone Potyviral Full-length Infectious CDNA Clones Expressing an Ectopic VPg

Overview

Journal Virol J

Publisher Biomed Central

Specialty Microbiology

Date 2015 Jun 14

PMID 26070311

Citations 20

Authors

Amandine Bordat

Marie-Christine Houvenaghel

Sylvie German-Retana

Affiliations

Soon will be listed here.

Abstract

Background: Approaches to simplify and accelerate the construction of full-length infectious cDNA clones for plant potyviruses have been described, based on cloning strategies involving in vitro ligation or homologous recombination in yeast. In the present study, we developed a faster and more efficient in vitro recombination system using Gibson assembly (GA), to engineer a Lettuce mosaic virus (LMV) infectious clone expressing an ectopic mcherry-tagged VPg (Viral protein genome-linked) for in planta subcellular localization of the viral protein in an infection context.

Methods: Three overlapping long distance PCR fragments were amplified and assembled in a single-step process based on in vitro recombination (Gibson assembly). The resulting 17.5 kbp recombinant plasmids (LMVmchVPg_Ec) were inoculated by biolistic on lettuce plants and then propagated mechanically on Nicotiana benthamiana. Confocal microscopy was used to analyze the subcellular localization of the ectopically expressed mcherry-VPg fusion protein.

Results: The Gibson assembly allowed the cloning of the expected plasmids without any deletion. All the inoculated plants displayed symptoms characteristic of LMV infection. The majority of the mcherry fluorescent signal observed using confocal microscopy was located in the nucleus and nucleolus as expected for a potyviral VPg.

Conclusions: This is the first report of the use of the Gibson assembly method to construct full-length infectious cDNA clones of a potyvirus genome. This is also the first description of the ectopic expression of a tagged version of a potyviral VPg without affecting the viability of the recombinant potyvirus.

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