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Three-dimensional reconstruction and comparison of vacuolar membranes in response to viral infection

Journal of Integrative Plant Biology 2021年第2期63卷 353-364页

作者： Xueting Wang Juncai Ma Xuejiao Jin Ning Yue Peng Gao keith ka ki mai Xian-Bing Wang Dawei Li Byung-Ho kang Yongliang Zhang State Key Laboratory of Agro-Biotechnology and Ministry of Agriculture Key Laboratory of Soil Microbiology College of Biological SciencesChina Agricultural UniversityBeijing 100193China State Key Laboratory of Agro-Biotechnology School of Life SciencesThe Chinese University of Hong KongHong Kong 999077China

The vacuole is a unique plant organelle that plays an important role in maintaining cellular homeostasis under various environmental stress conditions. However, the effects of biotic stress on vacuole structure has not been examined using three-dimensional(3D) visualization. Here, we performed 3D electron tomography to compare the ultrastructural changes in the vacuole during infection with different viruses. The 3D models revealed that vacuoles are remodeled in cells infected with cucumber mosaic virus(CMV) or tobacco necrosis virus A Chinese isolate(TNV-AC), resulting in the formation of spherules at the periphery of the vacuole. These spherules contain neck-like channels that connect their interior with the cytosol. Confocal microscopy of CMV replication proteins 1 a and 2 a and TNV-AC auxiliary replication protein p23 showed that all of these proteins localize to the *** microscopy revealed that the expression of these replication proteins alone is sufficient to induce spherule formation on the tonoplast, suggesting that these proteins play prominent roles in inducing vacuolar membrane remodeling. This is the first report of the 3D structures of viral replication factories built on the tonoplasts. These findings contribute to our understanding of vacuole biogenesis under normal conditions and during assembly of plant(+) RNA virus replication complexes.

关键词： comparison cucumber mosaic virus electron tomography spherules tobacco necrosis virus A vacuole viral replication

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