6533b85afe1ef96bd12b9892
RESEARCH PRODUCT
Role for calnexin and N-linked glycosylation in the assembly and secretion of hepatitis B virus middle envelope protein particles.
Reinhild PrangeMargaret Werrsubject
GlycanHepatitis B virusGlycosylationGlycosylationCalnexinImmunologyBiologymedicine.disease_causeMicrobiologychemistry.chemical_compoundCytosolN-linked glycosylationViral Envelope ProteinsVirologyCalnexinmedicineAnimalsSecretionPeptide sequenceHepatitis B virusBase SequenceCalcium-Binding ProteinsVirus-Cell Interactionscarbohydrates (lipids)BiochemistrychemistryOligodeoxyribonucleotidesInsect ScienceChaperone (protein)COS Cellsbiology.proteinMutagenesis Site-Directeddescription
ABSTRACT Unlike those of the S and the L envelope proteins, the functional role of the related M protein in the life cycle of the hepatitis B virus (HBV) is less understood. We now demonstrate that a single N glycan, specific for M, is required for efficient secretion of M empty envelope particles. Moreover, this glycan mediates specific association of M with the chaperone calnexin. Conversely, the N glycan, common to all three envelope proteins, is involved neither in calnexin binding nor in subviral particle release. As proper folding and trafficking of M need the assistance of the chaperone, the glycan-dependent association of M with calnexin may thus play a crucial role in the assembly of HBV. Beyond being modified by N glycosylation, M is modified by O glycosylation occurring within its amino acid sequence at positions 27 to 47. The O glycans, however, were found to be dispensable for secretion of M but may rather support viral infectivity. Surprisingly, nonglycosylated M localizes exclusively to the cytosol, either for degradation or for a yet-unknown function.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1998-01-07 | Journal of virology |