We have recently reported that the naturally occurring spliced variant of Hepatitis B virus protein, HBSP, displayed proapoptotic activity through its BH3 domain. To investigate whether the BH3 domain in HBSP interacted with Bcl-2 family of proteins, HBSP and Bcl-2 family of proteins were cloned and expressed in our mammalian two-hybrid system. Interaction assays were carried out in HepG2 cells and measured by the activity of the reporter gene product luciferase. Our results indicated that HBSP interacted with Bcl-2/Bcl-x1 in vitro and induced apoptosis in HepG2 cells. (C) 2008 IUBMB.
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