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Molecular Characterization Of Two Plant BI-1 Homologues Which Suppress Bax-induced Apoptosis In Human 293 Cells

N. Bolduc, Mario Ouellet, F. Pitre, L. Brisson
Published 2002 · Biology, Medicine

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Abstract. To date, few homologues of animal programmed cell death (PCD) regulators have been identified in plants. Among these is the plant Bax Inhibitor-1 (BI-1) protein, which possesses, like its human counterpart, the ability to suppress Bax-induced lethality in yeast cells. As the role of BI-1 in the regulation of plant PCD remains to be elucidated, we cloned BnBI-1 and NtBI-1 from cDNA libraries of oilseed rape (Brassica napus L.) and tobacco (Nicotiana tabacum L.). The analysis of the deduced amino acid sequences of BnBI-1 and NtBI-1 indicated that these proteins share a relatively high level of identity with other plant BI-1 proteins (73–95%) as well as with animal BI-1 proteins (26–42%). Comparative analysis with other available plant BI-1 proteins allowed the establishment of a structural model presenting seven transmembrane domains. Moreover, transient co-transfection of Bax with BnBI-1 or NtBI-1 in human embryonic kidney 293 cells revealed that both proteins can substantially inhibit apoptosis induced by Bax overexpression. Localization studies were also conducted using stable transformation of tobacco BY-2 cells and Saccharomyces cerevisiae, or transient expression in tobacco leaves, with the fusion protein BnBI-1GFP under control of the cauliflower mosaic virus 35S promoter. All transformants showed a fluorescence pattern of distribution typical of an endoplasmic reticulum (ER) protein. Results from differential permeabilization experiments in BY-2 cells expressing BnBI-1GFP also showed that the C-terminus is located on the cytosolic side of the ER. Taken altogether, our results suggest that BI-1 is evolutionarily conserved and could act as a key regulator of a death pathway common to plants and animals.
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