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In order to identify potential sites of hepadnavirus X protein action, we have investigated the subcellular distribution and the stability of woodchuck hepatitis virus (WHV) X protein (WHx) in primary hepatocytes isolated from woodchucks with persistent WHV infection. In vivo cell labeling and cell fractionation studies showed that the majority of WHx is a soluble cytoplasmic protein while a minor part of newly synthesized WHx is associated with a nuclear framework fraction (20%) and with cytoskeletal components (5 to 10%). Pulse-chase experiments revealed that cytoplasmic WHx has a short half-life and decays with bimodal kinetics (approximately 20 min and 3 h). The rates of association and turnover of nucleus-associated WHx suggest that compartmentalization may be responsible for the bimodal turnover observed in the cytoplasm.

journal of virology

Metabolic Labeling of Woodchuck Hepatitis B Virus X Protein in Naturally Infected Hepatocytes Reveals a Bimodal Half-Life and Association with the Nuclear Framework