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• W2075117841 abstract "Little is known about host cell factors necessary for hepatitis B virus (HBV) assembly which involves envelopment of cytosolic nucleocapsids by the S, M and L transmembrane viral envelope proteins and subsequent budding into intraluminal cisternae. Central to virogenesis is the L protein that mediates hepatocyte receptor binding and envelopment of capsids. To serve these topologically conflicting roles, L protein exhibits an unusual dual membrane topology, disposing its N-terminal preS domain inside and outside of the virion lipid envelope. The mixed topology is achieved by posttranslational preS translocation of about half of the L protein molecules across a post-endoplasmic reticulum membrane. Here we identify and characterize a preS-specific sequence that confers the suppression of cotranslational translocation even of a model reporter. This cytosolic anchorage sequence specifically binds the cognate heat shock protein Hsc70, thus indicating chaperone participitation in HBV morphogenesis. Conversely, the M envelope protein needs the assistance of the chaperone calnexin for proper folding and trafficking. Calnexin selectively binds to the N-glycan, specific for M, rather than to the N-glycan, common to all three envelope proteins. As inhibition of the calnexin-M interaction blocks the secretion of viral envelopes, we propose an essential role for calnexin, as well as for Hsc70, in chaperoning HBV assemby." @default.
• W2075117841 created "2016-06-24" @default.
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• W2075117841 date "1999-01-01" @default.
• W2075117841 modified "2023-10-01" @default.
• W2075117841 title "Chaperones Involved in Hepatitis B Virus Morphogenesis" @default.
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• W2075117841 doi "https://doi.org/10.1515/bc.1999.042" @default.
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