Impact of immune escape mutations and N-linked glycosylation on the secretion of hepatitis B virus virions and subviral particles: Role of the small envelope protein.
Impact of immune escape mutations and N-linked glycosylation on the secretion of hepatitis B virus virions and subviral particles: Role of the small envelope protein.
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DOI:
10.1016/j.virol.2018.03.011
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发表时间:
2018-05
期刊:
影响因子:
3.7
通讯作者:
Tong S
中科院分区:
文献类型:
--
作者:
Bi X;Tong S
Hepatitis B virus (HBV) expresses three co-terminal envelope proteins: large (L), middle (M), and small (S), with the S protein driving the secretion of both virions and subviral particles. Virion secretion requires N-linked glycosylation at N146 in the S domain but can be impaired by immune escape mutations. An M133T mutation creating a novel glycosylation site at N131could rescue virion secretion of N146Q mutant (loss of original glycosylation site) and immune escape mutants such as G145R. Here we demonstrate that other novel N-linked glycosylation sites could rescue virion secretion of the G145R and N146Q mutants to variable extents. Both G145R and N146Q mutations impaired virion secretion through the S protein. The M133T mutation restored virion secretion through the S protein, and could work in trans. Impaired virion secretion was not necessarily associated with a similar block in the secretion of subviral particles.
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