2001. assembly. General, tetherin is certainly potentially energetic against many enveloped infections and apt to be an important element of the antiviral innate immune system defense. Evolution provides endowed eukaryotic cells with a number of molecules and actions that can handle inhibiting the replication from the infections that parasitize them. Among these substances are portrayed constitutively, particular inhibitors of pathogen replication like the APOBEC3 protein (4, 32). Furthermore, components of the sort I interferon (IFN)-induced innate disease fighting capability can straight inhibit the replication of infections (29, 33). Subsequently, infections have progressed antagonists that inhibit the IFN response or straight counteract mobile antiviral features (such as for example lentivirus Vif protein that neutralize APOBEC3 protein) (4, 32). While the expression of many genes is known to be upregulated when cells encounter type I IFN, the actual mechanisms by which IFN-induced gene products inhibit virus replication are known for only a few of them. We and others recently identified an IFN-induced antiretroviral protein, termed tetherin, that appears mechanistically unique in that it blocks the release of nascent virions from human immunodeficiency virus type 1 (HIV-1)-infected cells (22, 23, 36). Notably, an HIV-1 accessory protein, Vpu, acts as a viral antagonist of tetherin. Specifically, Vpu colocalizes with tetherin and causes its downregulation from the cell surface (23, 36). Thus, the existence of tetherin explains the previously observed requirement for Vpu during HIV-1 particle release from certain cells, particularly those that have been exposed to type I IFN (11, 14, 22, 34, 37). Tetherin is a membrane protein with unusual topology in that it harbors a transmembrane anchor near it N terminus and a putative glycophosphatidyl-inositol lipid anchor at its C terminus (15). It appears to induce the formation of, and may indeed be a physical component of, protease-sensitive tethers that retain HIV-1 virions on infected cell surfaces (21, 23). Importantly, the HIV-1 particles whose retention is induced by tetherin are fully formed and mature and have independent lipid bilayers that are discontinuous with cell membranes (21, 23). Thus, tetherin seems to act after the formation of virus particles and prevents their dissemination to uninfected cells, apparently by causing the adherence of virion and cell membranes. The promiscuous expression of tetherin upon the exposure of cells to IFN (5, 23) suggests that it might be part of a broader innate immune defense that limits the replication of perhaps many enveloped viruses. Here, we investigate this possibility and show that tetherin is capable of blocking the release of particles assembled using the major structural proteins of a wide variety of Delcasertib retroviruses, including prototype members of the alpharetrovirus, betaretrovirus, deltaretrovirus, lentivirus, and spumaretrovirus genera. In addition, we show that the release of particles Delcasertib assembled using filovirus matrix proteins from Marburg virus (Mv) and Ebola virus (Eb) is also sensitive to inhibition by tetherin. These findings indicate that tetherin is a very broadly specific inhibitor of particle release from the plasma membrane and is therefore unlikely to require specific interactions with viral proteins to be effective. Thus, tetherin is potentially an effective component of the innate immune defense against many enveloped viruses and could provide an impetus for the evolution of tetherin antagonists such.Traffic 4671-680. interactions with viral proteins. Nonetheless, tetherin colocalized with nascent virus-like particles generated by several retroviral and filoviral structural proteins, indicating that it is present at, or recruited to, sites of particle assembly. Overall, tetherin is potentially active against many enveloped viruses and likely to be an important component of the antiviral innate immune defense. Evolution has endowed eukaryotic cells with a variety of molecules and activities that are capable of inhibiting the replication of the viruses that parasitize them. Among these molecules are constitutively expressed, specific inhibitors of virus replication such as the APOBEC3 proteins (4, 32). In addition, components of the type I interferon (IFN)-induced innate immune system can directly inhibit the replication of viruses (29, 33). In turn, viruses have evolved antagonists that inhibit the IFN response or directly counteract cellular antiviral functions (such as lentivirus Vif proteins that neutralize APOBEC3 proteins) (4, 32). While the expression of many genes is known to be upregulated when cells encounter type I IFN, the actual mechanisms by which IFN-induced gene products inhibit virus replication are known for only a few of them. We and others recently identified an IFN-induced antiretroviral protein, termed tetherin, that appears mechanistically unique in that it blocks the release of nascent virions from human immunodeficiency virus type 1 (HIV-1)-infected cells (22, 23, 36). Notably, an HIV-1 accessory protein, Vpu, acts as a viral antagonist of tetherin. Rabbit Polyclonal to GTPBP2 Specifically, Vpu colocalizes with tetherin and causes its downregulation from the cell surface (23, 36). Thus, the existence of Delcasertib tetherin explains the previously observed requirement for Vpu during HIV-1 particle release from certain cells, particularly those that have been exposed to type I IFN (11, 14, 22, 34, 37). Tetherin is a membrane protein with unusual topology in that it harbors a transmembrane anchor near it N terminus and a putative glycophosphatidyl-inositol lipid anchor at its C terminus (15). It appears to induce the formation of, and may indeed be a physical component of, protease-sensitive tethers that retain HIV-1 virions on infected cell surfaces (21, 23). Importantly, the HIV-1 particles whose retention is induced by tetherin are fully formed and mature and have independent lipid bilayers that are discontinuous with cell membranes (21, 23). Thus, tetherin seems to act after Delcasertib the formation of virus particles and prevents their dissemination to uninfected cells, apparently by causing the adherence of virion and cell membranes. The promiscuous expression of tetherin upon the exposure of cells to IFN (5, 23) suggests that it might be part of a broader innate immune defense that limits the replication of perhaps many enveloped viruses. Here, we investigate this possibility and show that tetherin is capable of blocking the release of particles assembled using the major structural proteins of a wide variety of retroviruses, including prototype members of the alpharetrovirus, betaretrovirus, deltaretrovirus, lentivirus, and spumaretrovirus genera. In addition, we show that the release of particles assembled using filovirus matrix proteins from Marburg virus (Mv) and Ebola virus (Eb) is also sensitive to inhibition by tetherin. These findings indicate that tetherin is a very broadly specific inhibitor of particle release from the plasma membrane and is therefore unlikely to require specific interactions with viral proteins to be effective. Thus, tetherin is potentially an effective component of the innate immune defense against many enveloped viruses.