Clathrin-mediated endocytosis and lysosomal cleavage of hepatitis B virus capsid-like core particles

The Journal of Biological Chemistry
Arik Cooper, Yosef Shaul

Abstract

The hepatitis B virus (HBV) core particle serves as a protective capsid shell for the viral genome and is highly immunogenic. Recombinant capsid-like core particles are used as effective carriers of foreign T and B cell epitopes and as delivery vehicles for oligonucleotides. The core monomer contains an arginine-rich C terminus that directs core particle attachment to cells via membrane heparan sulfate proteoglycans. Here we investigated the mechanism of recombinant core particle uptake and its intracellular fate following heparan sulfate binding. We found that the core particles are internalized in an energy-dependent manner. Core particle uptake is inhibited by chlorpromazine and by cytosol acidification known to block clathrin-mediated endocytosis but not by nystatin, which blocks lipid raft endocytosis. Particle uptake is abolished by expression of dominant negative forms of eps15 and Rab5, adaptors involved in clathrin-mediated endocytosis and early endosome transport, respectively. Endocytosed particles are transported to lysosomes where the core monomer is endoproteolytically cleaved into its distinct domains. Using protease inhibitors, cathepsin B was identified as the enzyme responsible for core monomer cleavage. Final...Continue Reading

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