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Abstract:
Programmed cell death (PCD) in animals depends on caspase proteaseactivity. Plants also exhibit PCD, for example as a responseto pathogens, although a plant caspase remains elusive. Herewe show that vacuolar processing enzyme (VPE) is a proteaseessential for a virus-induced hypersensitive response that involvesPCD. VPE deficiency prevented virus-induced hypersensitive celldeath in tobacco plants. VPE is structurally unrelated to caspases,although VPE has a caspase-1 activity. Thus, plants have evolveda regulated cellular suicide strategy that, unlike PCD of animals,is mediated by VPE and the cellular vacuole.
1 Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan. 2 Department of Cell Biology, National Institute for Basic Biology, Okazaki 444-8585, Japan. 3 School of Life Science, Graduate University for Advanced Studies, Okazaki 444-8585, Japan. 4 National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan. 5 National Agricultural Research Center, Tsukuba 305-8666, Japan.
* To whom correspondence should be addressed. E-mail: ihnishi{at}gr.bot.kyoto-u.ac.jp
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