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Published on October 30, 2009; 10.1104/pp.109.147983

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Received September 23, 2009
Accepted October 27, 2009

A Host RNA Helicase-Like Protein, AtRH8, Interacts with the Potyviral Genome-Linked Protein, VPg, Associates with the Virus Accumulation Complex, and Is Essential for Infection

Tyng-Shyan Huang , Taiyun Wei , Jean-Francois Laliberte , and Aiming Wang *

Agriculture and Agri-Food Canada, Southern Crop Protection and Food Research Centre, 1391 Sandford Street, London, Ontario N5V 4T3, Canada; Department of Biology, the University of Western Ontario, London, Ontario, N6A 5B7, Canada; Institut national de la recherche scientifique, Institut Armand-Frappier, Laval, Quebec H7V 1B7, Canada

* Corresponding author; email: Aiming.Wang{at}AGR.GC.CA.

The viral genome-linked protein, VPg, of potyviruses is a multifunctional protein involved in viral genome translation and replication. Previous studies have shown that both eIF4E and eIF4G or their respective isoforms from the eIF4F complex, which modulates the initiation of protein translation, selectively interact with VPg and are required for potyvirus infection. Here, we report the identification of two DEAD-box RNA helicase-like proteins, PpDDXL and AtRH8 from Prunus persica and Arabidopsis thaliana, respectively, both interacting with VPg. We show that AtRH8 is dispensable for plant growth and development but necessary for potyvirus infection. In potyvirus-infected Nicotiana benthamiana leaf tissues, AtRH8 colocalizes with the chloroplast-bound virus accumulation vesicles, suggesting a possible role of AtRH8 in viral genome translation and replication. Deletion analyses of AtRH8 have identified the VPg-binding region. Comparison of this region and the corresponding region of PpDDXL suggests that they are highly conserved and share the same secondary structure. Moreover, overexpression of the VPg-binding region from either AtRH8 or PpDDXL suppresses potyvirus accumulation in infected N. benthamiana leaf tissues. Taken together these data demonstrate that AtRH8, interacting with VPg, is a host factor required for the potyvirus infection process and both AtRH8 and PpDDXL may be manipulated for the development of genetic resistance against potyvirus infections.






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