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15 risultati
Activity, specificity, and probe design for the smallpox virus protease K7L.
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The K7L gene product of the smallpox virus is a protease implicated in the maturation of viral proteins. K7L belongs to protease Clan CE, which includes distantly related cysteine proteases from eukaryotes, pathogenic bacteria, and viruses. Here, we describe its recombinant high level expression,
Isolation of HIV-1 protease-inhibiting peptides from thermolysin hydrolysate of oyster proteins.
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The peptides inhibiting HIV-1 protease were isolated from the hydrolysate of oyster (Crassostrea gigas) proteins prepared with thermolysin. The amino acid sequences of the peptides were determined as Leu-Leu-Glu-Tyr-Ser-Ile and Leu-Leu-Glu-Tyr-Ser-Leu. These sequences exist in some proteins of
Genes of variola and vaccinia viruses necessary to overcome the host protective mechanisms.
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Analysis of variola virus nucleotide sequence revealed proteins belonging to several families which provide the virus with the possibility of overcoming the barriers of specific and non-specific host defence against viral infection. The complement-binding proteins, lymphokine-binding proteins, and
Repair of a previously uncharacterized second host-range gene contributes to full replication of modified vaccinia virus Ankara (MVA) in human cells.
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Modified vaccinia virus Ankara (MVA), a widely used vaccine vector for expression of genes of unrelated pathogens, is safe, immunogenic, and can incorporate large amounts of added DNA. MVA was derived by extensively passaging the chorioallantois vaccinia virus Ankara (CVA) vaccine strain in chicken
Diminished intracellular invariant chain expression after vaccinia virus infection.
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Vaccinia virus (VV) has been used as a vaccine to eradicate smallpox and as a vaccine for HIV and tumors. However, the immunoevasive properties of VV have raised safety concerns. VV infection of APCs perturbs MHC class II-mediated Ag presentation. Exposure of human B cell lines to VV induced a
Species Specificity of Vaccinia Virus Complement Control Protein for the Bovine Classical Pathway Is Governed Primarily by Direct Interaction of Its Acidic Residues with Factor I.
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Poxviruses display species tropism-variola virus is a human-specific virus, while vaccinia virus causes repeated outbreaks in dairy cattle. Consistent with this, variola virus complement regulator SPICE (smallpox inhibitor of complement enzymes) exhibits selectivity in inhibiting the human
Vaccinia virus gene A36R encodes a M(r) 43-50 K protein on the surface of extracellular enveloped virus.
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A characterization of vaccinia virus strain Western Reserve (WR) open reading frame (ORF) A36R is described. This ORF is predicted to encode a 221-amino-acid protein (M(r) 25.1 K) with an amino-terminal hydrophobic sequence, seven potential sites for attachment of N-linked carbohydrate, but no
Characterization of the ectromelia virus serpin, SPI-2.
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Poxviruses encode multiple proteins that enable them to evade host responses. Among these are serine protease inhibitors (serpins). One of the earliest serpins described, cowpox virus crmA, acts to inhibit inflammation and apoptosis. crmA homologous serpins, known as SPI-2, are conserved in
Disabling complement regulatory activities of vaccinia virus complement control protein reduces vaccinia virus pathogenicity.
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Poxviruses encode a repertoire of immunomodulatory proteins to thwart the host immune system. One among this array is a homolog of the host complement regulatory proteins that is conserved in various poxviruses including vaccinia (VACV) and variola. The vaccinia virus complement control protein
Induction of potent humoral and cell-mediated immune responses by attenuated vaccinia virus vectors with deleted serpin genes.
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Vaccinia virus (VV) has been effectively utilized as a live vaccine against smallpox as well as a vector for vaccine development and immunotherapy. Increasingly there is a need for a new generation of highly attenuated and efficacious VV vaccines, especially in light of the AIDS pandemic and the
Immune response to poxvirus infections in various animals.
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The study of infections of vertebrate animals by poxviruses has remained a dynamic area of research for the last century. The host range of poxviruses vary from extremely narrow to exceedingly broad, and they have been shown to enter their host by either the respiratory route or through the skin.
Vaccinia viruses with a serpin gene deletion and expressing IFN-gamma induce potent immune responses without detectable replication in vivo.
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In a continuing effort to develop safe and efficacious vaccine and immunotherapeutic vectors, we constructed recombinant vaccinia virus (rVV) vaccines lacking either the B13R (SPI-2) or the B22R (SPI-1) immune-modulating gene and coexpressing IFN-gamma. B13R and B22R are nonessential VV
Poxvirus pathogenesis.
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Poxviruses are a highly successful family of pathogens, with variola virus, the causative agent of smallpox, being the most notable member. Poxviruses are unique among animal viruses in several respects. First, owing to the cytoplasmic site of virus replication, the virus encodes many enzymes
A survey of host range genes in poxvirus genomes.
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Poxviruses are widespread pathogens, which display extremely different host ranges. Whereas some poxviruses, including variola virus, display narrow host ranges, others such as cowpox viruses naturally infect a wide range of mammals. The molecular basis for differences in host range are poorly
Discovery of small molecule inhibitors of ubiquitin-like poxvirus proteinase I7L using homology modeling and covalent docking approaches.
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Essential for viral replication and highly conserved among poxviridae, the vaccinia virus I7L ubiquitin-like proteinase (ULP) is an attractive target for development of smallpox antiviral drugs. At the same time, the I7L proteinase exemplifies several interesting challenges from the rational drug
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