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Localization of the Arabidopsis Senescence- and Cell Death-Associated BFN1 Nuclease： From the ER to Fragmented Nuclei

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Molecular Plant 2011年第6期4卷 1062-1073页

作者： Sarit Farage-Barhom Shaul Burd Lilian Sonego Ana Mett Eduard Belausov david gidoni Amnon Lers Department of Postharvest Science of Fresh Produce Volcani Center Agricultural Research Organization Bet Dagan 50250 Israe Faculty of Life Science Bar Ilan University Ramat Gan Israel Department of Vegetable Research Volcani Center Agricultural Research Organization Bet Dagan 50250 Israel Department of Ornamental Horticulture Volcani Center Agricultural Research Organization Bet Dagan 50250 Israe

Plant senescence- or PCD-associated nucleases share significant homology with nucleases from different organisms. However, knowledge of their function is limited. Intracellular localization of the Arabidopsis senescence- and PCD-associated nuclease BFN1 was investigated. Analysis of BFN1-GFP localization in transiently transformed tobacco protoplasts revealed initial localization in filamentous structures spread throughout the cytoplasm, which then clustered around the nuclei as the protoplasts senesced. These filamentous structures were identified as being of ER origin. In BFN1- GFP-transgenicArabidopsis plants, similar localization of BFN1-GFP was observed in young leaves, that is, in filamentous structures that reorganized around the nuclei only in senescing cells. In late senescence, BFN1-GFP was localized with fragmented nuclei in membrane-wrapped vesicles. BFNI＇s postulated function as a nucleic acid-degrading enzyme in senescence and PCD is supported by its localization pattern. Our results suggest the existence of a dedicated compartment mediating nucleic acid degradation in senescence and PCD processes.

关键词： BFN1 endoplasmic reticulum nuclease nuclear DNA programmed cell death senescence sub-cellular localization.

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