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Antagonism to and Intracellular Sequestration of Human Tetherin by the Human Immunodeficiency Virus Type 2 Envelope Glycoprotein
被引:238
作者:
Le Tortorec, Anna
[1
]
Neil, Stuart J. D.
[1
]
机构:
[1] Kings Coll London, Guys Hosp, Dept Infect Dis, Sch Med, London SE1 9RT, England
关键词:
VIRAL PARTICLE RELEASE;
CELL-SURFACE;
VPU PROTEIN;
CYTOPLASMIC DOMAIN;
RESTRICTION FACTOR;
DOWN-MODULATION;
AIDS VIRUS;
HIV-1;
ENDOCYTOSIS;
EXPRESSION;
D O I:
10.1128/JVI.01515-09
中图分类号:
Q93 [微生物学];
学科分类号:
071005 ;
100705 ;
摘要:
Tetherin (CD317/BST-2), an interferon-induced membrane protein, restricts the release of nascent retroviral particles from infected cell surfaces. While human immunodeficiency virus type 1 (HIV-1) encodes the accessory gene vpu to overcome the action of tetherin, the lineage of primate lentiviruses that gave rise to HIV-2 does not. It has been previously reported that the HIV-2 envelope glycoprotein has a Vpu-like function in promoting virus release. Here we demonstrate that the HIV-2 Rod envelope glycoprotein (HIV-2 Rod Env) is a tetherin antagonist. Expression of HIV-2 Rod Env, but not that of HIV-1 or the closely related simian immunodeficiency virus (SIV) SIVmac1A11, counteracts tetherin-mediated restriction of Vpu-defective HIV-1 in a cell-type-specific manner. This correlates with the ability of the HIV-2 Rod Env to mediate cell surface downregulation of tetherin. Antagonism requires an endocytic motif conserved across HIV/SIV lineages in the gp41 cytoplasmic tail, but specificity for tetherin is governed by extracellular determinants in the mature Env protein. Coimmunoprecipitation studies suggest an interaction between HIV-2 Rod Env and tetherin, but unlike studies with Vpu, we found no evidence of tetherin degradation. In the presence of HIV-2 Rod Env, tetherin localization is restricted to the trans-Golgi network, suggesting Env-mediated effects on tetherin trafficking sequester it from virus assembly sites on the plasma membrane. Finally, we recapitulated these observations in HIV-2-infected CD4(+) T-cell lines, demonstrating that tetherin antagonism and sequestration occur at physiological levels of Env expression during virus replication.
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页码:11966 / 11978
页数:13
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