First published online December 17, 2004; 10.1105/tpc.104.027235
The Plant Cell 17:311-325 (2005)
© 2005 American Society of Plant Biologists
A NAC Domain Protein Interacts with Tomato leaf curl virus Replication Accessory Protein and Enhances Viral Replication
Luke A. Seltha,b,
Satish C. Dograa,b,
M. Saif Rasheeda,b,c,
Helen Healyb,
John W. Randlesb and
M. Ali Rezaiana,1
a Horticulture Unit, Commonwealth Scientific and Industrial Research Organization, Plant Industry, Glen Osmond, South Australia, 5064, Australia
b School of Agriculture and Wine, University of Adelaide, Adelaide, South Australia, 5005, Australia
c National Institute for Biotechnology and Genetic Engineering, Faisalabad, Pakistan
1 To whom correspondence should be addressed. E-mail ali.rezaian{at}csiro.au; fax 618-8303-8601.
Geminivirus replication enhancer (REn) proteins dramatically increase the accumulation of viral DNA species by an unknown mechanism. In this study, we present evidence implicating SlNAC1, a new member of the NAC domain protein family from tomato (Solanum lycopersicum), in Tomato leaf curl virus (TLCV) REn function. We isolated SlNAC1 using yeast (Saccharomyces cerevisiae) two-hybrid technology and TLCV REn as bait, and confirmed the interaction between these proteins in vitro. TLCV induces SlNAC1 expression specifically in infected cells, and this upregulation requires REn. In a transient TLCV replication system, overexpression of SlNAC1 resulted in a substantial increase in viral DNA accumulation. SlNAC1 colocalized with REn to the nucleus and activated transcription of a reporter gene in yeast, suggesting that in healthy cells it functions as a transcription factor. Together, these results imply that SlNAC1 plays an important role in the process by which REn enhances TLCV replication.
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