Interaction with host SGS3 is required for suppression of RNA silencing by tomato yellow leaf curl virus V2 protein

Efrat Glick, Avi Zrachya, Yael Levy, Anahit Mett, David Gidoni, Eduard Belausov, Vitaly Citovsky, Yedidya Gafni

Research output: Contribution to journalArticlepeer-review

238 Scopus citations

Abstract

The V2 protein of tomato yellow leaf curl geminivirus (TYLCV) functions as an RNA-silencing suppressor that counteracts the innate immune response of the host plant. The host-cell target of V2, however, remains unknown. Here we show that V2 interacts directly with SlSGS3, the tomato homolog of the Arabidopsis SGS3 protein (AtSGS3), which is known to be involved in the RNA-silencing pathway. SlSGS3 genetically complemented an AtSGS3 mutation and restored RNA silencing, indicating that SlSGS3 is indeed a functional homolog of AtSGS3. A point mutant of V2 that is unable to bind SlSGS3 also lost its ability to suppress RNA silencing, suggesting a correlation between the V2-SlSGS3 interaction in planta and the suppressor activity of V2.

Original languageEnglish
Pages (from-to)157-161
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume105
Issue number1
DOIs
StatePublished - 8 Jan 2008
Externally publishedYes

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