Interaction with a Host Ubiquitin-Conjugating Enzyme Is Required for the Pathogenicity of a Geminiviral DNA β Satellite
| Autor: | Omid Eini, Satish Dogra, Luke A. Selth, Ian B. Dry, John W. Randles, M. Ali Rezaian |
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| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Molecular Plant-Microbe Interactions, Vol 22, Iss 6, Pp 737-746 (2009) |
| Druh dokumentu: | article |
| ISSN: | 1943-7706 0894-0282 |
| DOI: | 10.1094/MPMI-22-6-0737 |
| Popis: | DNA β is a single-stranded satellite DNA which encodes a single gene, βC1. To better understand the role of βC1 in the pathogenicity of DNA β, a yeast two-hybrid screen of a tomato cDNA library was carried out using βC1 from Cotton leaf curl Multan virus (CLCuMV) DNA β as the bait. A ubiquitin-conjugating enzyme, designated SlUBC3, which functionally complemented a yeast mutant deficient in ubiquitin-conjugating enzymes was identified. The authenticity and specificity of the interaction between βC1 and SlUBC3 was confirmed both in vivo, using a bimolecular fluorescence complementation assay, and in vitro, using a protein-binding assay. Analysis of deletion mutants of the βC1 protein showed that a myristoylation-like motif is required both for its interaction with SlUBC3 and the induction of DNA-β-specific symptoms in host plants. The level of polyubiquitinated proteins in transgenic tobacco plants expressing βC1 was found to be reduced compared with wild-type plants. These results are consistent with the hypothesis that interaction of βC1 with SlUBC3 is required for DNA-β-specific symptom induction, and that this is possibly due to downregulation of the host ubiquitin proteasome pathway. |
| Databáze: | Directory of Open Access Journals |
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