Turnip Mosaic Virus Components Are Released into the Extracellular Space by Vesicles in Infected Leaves.

Autor: Movahed N; Department of Biology, McGill University, Montréal, Québec, H3A 1B1, Canada., Cabanillas DG; Institut National de la Recherche Scientifique-Institut Armand-Frappier, Laval, Québec, H7V 1B7, Canada., Wan J; Department of Plant and Microbial Biology, University of California, Berkeley, California 94720., Vali H; Facility for Electron Microscopy Research, McGill University, Montréal, Québec, H3A 0C7, Canada.; Department of Anatomy & Cell Biology, McGill University, Montréal, Québec, H3A 0C7, Canada., Laliberté JF; Institut National de la Recherche Scientifique-Institut Armand-Frappier, Laval, Québec, H7V 1B7, Canada., Zheng H; Department of Biology, McGill University, Montréal, Québec, H3A 1B1, Canada hugo.zheng@mcgill.ca.
Jazyk: angličtina
Zdroj: Plant physiology [Plant Physiol] 2019 Jul; Vol. 180 (3), pp. 1375-1388. Date of Electronic Publication: 2019 Apr 24.
DOI: 10.1104/pp.19.00381
Abstrakt: Turnip mosaic virus (TuMV) reorganizes the endomembrane system of the infected cell to generate endoplasmic-reticulum-derived motile vesicles containing viral replication complexes. The membrane-associated viral protein 6K 2 plays a key role in the formation of these vesicles. Using confocal microscopy, we observed that this viral protein, a marker for viral replication complexes, localized in the extracellular space of infected Nicotiana benthamiana leaves. Previously, we showed that viral RNA is associated with multivesicular bodies (MVBs). Here, using transmission electron microscopy, we observed the proliferation of MVBs during infection and their fusion with the plasma membrane that resulted in the release of their intraluminal vesicles in the extracellular space. Immunogold labeling with a monoclonal antibody that recognizes double-stranded RNA indicated that the released vesicles contained viral RNA. Focused ion beam-extreme high-resolution scanning electron microscopy was used to generate a three-dimensional image that showed extracellular vesicles in the cell wall. The presence of TuMV proteins in the extracellular space was confirmed by proteomic analysis of purified extracellular vesicles from N benthamiana and Arabidopsis ( Arabidopsis thaliana ). Host proteins involved in biotic defense and in interorganelle vesicular exchange were also detected. The association of extracellular vesicles with viral proteins and RNA emphasizes the implication of the plant extracellular space in viral infection.
(© 2019 American Society of Plant Biologists. All Rights Reserved.)
Databáze: MEDLINE
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