期刊
PLANT CELL REPORTS
卷 28, 期 1, 页码 41-51出版社
SPRINGER
DOI: 10.1007/s00299-008-0630-x
关键词
Bax; Mitochondrion; N. tabacum; Pathogen defense; VDAC
资金
- Nara Institute of Science and Technology
- Ministry of Education, Culture, Sports, Science, and Technology of Japan
- Japan Society for the Promotion of Science [19658039, 19780002]
- Saito Gratitude Foundation
- Sumitomo Foundation
The voltage-dependent anion channel (VDAC) is a major outer mitochondrial membrane protein. It is well documented that VDAC plays an important role in apoptosis, a kind of programmed cell death, in mammalian systems. However, little is known about the role of the plant counterpart during the process of plant-specific cell death such as pathogen-induced hypersensitive response. To address this issue, we isolated three VDAC full-length cDNAs (NtVDAC1-3) from Nicotiana tabacum. The deduced products, NtVDACs, share 78-85% identity and retain the conserved eukaryotic mitochondrial porin signature distal to their C-terminal regions. Mitochondrial localization of three NtVDACs in plant cells was confirmed via a green fluorescent protein fusion method. Then, we addressed the main issue concerning pathogenesis relation. The N. benthamiana orthologues of NtVDACs were upregulated by challenge with the non-host pathogen Pseudomonas cichorii, but not after challenge with the virulent pathogen P. syringae pv. tabaci. Both the pharmaceutical inhibition of VDAC and silencing of NbVDACs genes compromised the non-host resistance against P. cichorii, suggesting the involvement of VDACs in defense against non-host pathogen. Involvement of NbVDACs in Bax-mediated cell death was also verified using a similar approach.
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