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• W2116034369 abstract "The biosynthesis and topology of the large envelope protein (L protein) of hepadnaviruses was investigated using the duck hepatitis B virus (DHBV) model, which also allows the study of hepadnavirus morphogenesis in experimentally infected hepatocytes. Results from proteolysis of virus particles and from the analysis of topology and posttranslational modification of L chains synthesized in vivo or in a cell-free system both support the presence of a mixed population of L-protein molecules with their N-terminal pre-S domain located either inside or outside the virus particle. During L biosynthesis and DHBV morphogenesis, pre-S, together with the neighboring transmembrane domain (TM-I), initially remained cytoplasmically disposed and was translocated only posttranslationally. Delayed pre-S translocation into a post-endoplasmic reticulum compartment is also indicated by the absence of glycosylation at a modification-competent pre-S glycosylation site. Major features of L-protein biosynthesis and of the resulting dual topology appear to be conserved between avian and mammalian hepadnaviruses, supporting the model that pre-S domains function in part either as an internal matrix for capsid envelopment or externally as a ligand for cellular receptor binding. However, differences in the mechanisms controlling pre-S translocation were revealed by the results of mutational analyses identifying and characterizing cis-acting determinants in pre-S that delay its cotranslational translocation. Our data from DHBV demonstrate the negative influence of a cluster of positively charged amino acid residues next to TM-I, a motif that is conserved among the avian but absent from mammalian hepadnaviruses. Additional control elements, which are apparently shared between both virus groups and which may serve in chaperone binding, were mapped by deletion analysis in the central part of pre-S." @default.
• W2116034369 created "2016-06-24" @default.
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• W2116034369 creator A5072127887 @default.
• W2116034369 date "1997-12-01" @default.
• W2116034369 modified "2023-10-16" @default.
• W2116034369 title "Dual topology of the large envelope protein of duck hepatitis B virus: determinants preventing pre-S translocation and glycosylation" @default.
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• W2116034369 doi "https://doi.org/10.1128/jvi.71.12.9434-9441.1997" @default.
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