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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Hepatitis B virus core protein interacts with the C-terminal region of actin-binding protein.

Hepatitis B viral core protein is present in the nucleus and cytoplasm of infected hepatocytes. There is a strong correlation between the intrahepatic distribution of core protein and the viral replication state and disease activity in patients with chronic hepatitis. To understand the role of core protein in the pathogenesis of HBV, we used a yeast two-hybrid system to search for cellular proteins interacting with the carboxyl terminus of core protein, as this region is involved in a number of important functions in the viral replication cycle including RNA packaging and DNA synthesis. A cDNA encoding the extreme C-terminal region of human actin-binding protein, ABP-276/278, was identified. This interaction was further confirmed both in vitro and in vivo. In addition, the extreme C-terminal region of ABP-276/278 interacted with the nearly full-length HBV core protein. Since this region is present in both the core and the precore proteins, it is likely that both core and precore proteins of HBV can interact with the C-terminal region of ABP-276/278. The minimal region of ABP-276/278 which interacted with the HBV core protein was the C-terminal 199 amino acid residues which correspond to part of the 23rd repeat, the entire 24th repeat and the intervening hinge II region in ABPs. The potential functional outcome of ABP interaction in HBV replication and its contribution to the pathological changes seen in patients with chronic HBV infection are discussed.[1]


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