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- W1493281034 abstract "We have investigated the membrane topology of the large envelope protein of duck hepatitis B virus (DHBV) by protease protection and Western blot analysis, using monoclonal antibodies specific for the pre-S and S regions of the DHBV envelope to characterize protease-resistant polypeptides. These studies showed that DHBV L protein exhibits a mixed membrane topology similar to that of human hepatitis B virus L, with approximately half of the L molecules displaying pre-S on the surface of virus particles and the remainder with pre-S sequestered inside the virus envelope. The C-terminal region of DHBV pre-S was susceptible to protease digestion on all DHBV particle L protein, indicating that this region was externally disposed. DHBV L protein pre-S was entirely cytosolic immediately after synthesis. Our data, therefore, suggested that an intermediate form of the DHBV L molecule exists in mature envelope particles in which L is partially translocated or exists in a translocation-ready conformation. Incubation of virus particles at low pH and 37 degrees C triggered conversion of this intermediate into a fully translocated form. We have proposed a model for pre-S translocation based on our results that invokes the presence of an aqueous pore in the virus envelope, most likely created by oligomerization of transmembrane domains in the S region. The model predicts that pre-S is transported through this pore and that a loop structure is formed because the N terminus remains anchored to the inner face of the membrane. This translocation process occurs during particle morphogenesis and may also be a prerequisite to virus uncoating during infection." @default.
- W1493281034 created "2016-06-24" @default.
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- W1493281034 date "1997-02-01" @default.
- W1493281034 modified "2023-10-16" @default.
- W1493281034 title "Topology of the large envelope protein of duck hepatitis B virus suggests a mechanism for membrane translocation during particle morphogenesis" @default.
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- W1493281034 doi "https://doi.org/10.1128/jvi.71.2.1107-1114.1997" @default.
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