Functional analysis of the five melon necrotic spot virus genome-encoded proteins
| Autor: | Vicente Pallás, José A. Navarro, Ainhoa Genovés |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Microscopy
Confocal Staining and Labeling biology Melon necrotic spot virus Carmovirus Green Fluorescent Proteins RNA Nicotiana benthamiana Virus Replication biology.organism_classification Virology Virus Plant Leaves Plant Viral Movement Proteins Cucurbitaceae Viral Proteins Tombusviridae RNA silencing Viral replication Genes Reporter Mutation RNA Interference Plant Diseases |
| Zdroj: | Journal of General Virology. 87:2371-2380 |
| ISSN: | 1465-2099 0022-1317 |
| DOI: | 10.1099/vir.0.81793-0 |
| Popis: | Function of the melon necrotic spot virus (MNSV) genome-encoded proteins (p29, p89, p7A, p7B and p42) has been studied. Protein-expression mutants of an infectious, full-length cDNA clone of a Spanish MNSV-Al isolate and a recombinant green fluorescent protein (GFP)-expressing virus were used in infection bioassays on melon plants. Results revealed that p29 and p89 are both essential for virus replication, whereas small proteins p7A and p7B are sufficient to support viral movement between adjacent cells operating in trans. It is also demonstrated that, in addition to its structural role as coat protein, p42 is an important factor controlling symptoms and is required for systemic transport. Moreover, both p42 and p7B, among all of the MNSV-encoded proteins, were able to delay RNA silencing in transient-expression assays on GFP-transgenic Nicotiana benthamiana plants. Finally, the presence of p42 also produced an enhancing effect on local spread similar to that of potyviral helper component proteinase (HC-Pro), probably due to its RNA silencing-suppression ability. |
| Databáze: | OpenAIRE |
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