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Molecular characterization of a prominent antigen of the vaccinia virus envelope.
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During vaccinia virus (VV) assembly a major polypeptide migrating with an apparent MW of 35K, designated Ag35, is expressed as an early function and becomes an integral component of the lipoprotein envelope surrounding the mature virion. In a previous study evaluating humoral immunity to VV, a
Orthologs of the vaccinia A13L and A36R virion membrane protein genes display diversity in species of the genus Orthopoxvirus.
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Alignment of vaccinia and variola virus genomes has highlighted some targets that display diversity. We have investigated the sequence diversity of two viral membrane protein genes from 36 different orthopoxvirus (OPV) strains to evaluate the suitability of these loci to differentiate between OPV
Static and dynamic protein phosphorylation in the Vaccinia virion.
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To the best of our knowledge, two phosphorylation sites have been reported previously, among 11 known Vaccinia virus phosphoproteins. Here, via phosphopeptide mass spectrometry, up to 189 phosphorylation sites were identified among 48 proteins in preparations of purified Vaccinia mature virus (MV).
Characterization of the vaccinia virus F8L protein.
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Vaccinia virus infection dramatically affects the host actin cytoskeleton by inducing disassembly of actin stress fibres and formation of actin tails which propel the virus intra- and intercellularly. The viral factors responsible for these actin rearrangements remain unknown. Sequence analysis
Vaccinia virus expresses a novel profilin with a higher affinity for polyphosphoinositides than actin.
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We expressed in Escherichia coli the vaccinia virus gene for a protein similar to vertebrate profilins, purified the recombinant viral profilin, and characterized its interactions with actin and polyphosphoinositides. Compared with cellular profilins, this viral profilin has a low affinity (Kd > or
Proteolytic cleavage of vaccinia virus virion proteins. Mutational analysis of the specificity determinants.
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Previous studies have suggested that cleavage of vaccinia virus core protein precursors occurs within the consensus tripeptide motif -A-G decreases X-. As an approach to delineate the sequence and structural features of the precursor polypeptides that are responsible for directing site-specific
Proline-rich tyrosine kinase 2 and Rac activation by chemokine and integrin receptors controls NK cell transendothelial migration.
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Protein tyrosine kinase activation is an important requisite for leukocyte migration. Herein we demonstrate that NK cell binding to endothelium activates proline-rich tyrosine kinase 2 (Pyk-2) and the small GTP binding protein Rac that are coupled to integrin and chemokine receptors.
Identification of second-site mutations that enhance release and spread of vaccinia virus.
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The spread of most strains of vaccinia virus in cell monolayers occurs predominantly via extracellular enveloped virions that adhere to the tips of actin-containing microvilli and to a lesser extent via diffusion of released virions. The mechanism by which virions adhere to the cell surface is
Sequence-divergent chordopoxvirus homologs of the o3 protein maintain functional interactions with components of the vaccinia virus entry-fusion complex.
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Composed of 35 amino acids, O3 is the smallest characterized protein encoded by vaccinia virus (VACV) and is an integral component of the entry-fusion complex (EFC). O3 is conserved with 100% identity in all orthopoxviruses except for monkeypox viruses, whose O3 homologs have 2 to 3 amino acid
Functional expression of human mannan-binding proteins (MBPs) in human hepatoma cell lines infected by recombinant vaccinia virus: post-translational modification, molecular assembly, and differentiation of serum and liver MBP.
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Human mannan-binding proteins (MBPs) occur in two forms, serum MBP (S-MBP) and liver MBP (L-MBP), both of which are synthesized in the liver from a single form of human MBP mRNA. To investigate further the mechanisms of post-translational modification, molecular assembly and differentiation of S-MBP
Vaccinia virus morphogenesis: a13 phosphoprotein is required for assembly of mature virions.
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The 70-amino-acid A13L protein is a component of the vaccinia virus membrane. We demonstrate here that the protein is expressed at late times of infection, undergoes phosphorylation at a serine residue(s), and becomes encapsidated in a monomeric form. Phosphorylation is dependent on Ser40, which
A prominent antigenic surface polypeptide involved in the biogenesis and function of the vaccinia virus envelope.
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Polypeptides of the vaccinia virus envelope exposed on the surface were identified by means of sulfo-N-hydroxysuccinimidobiotin as a surface tag. Among surface expressed polypeptides is the 35-kDa antigen, previously designated Ag35. Both monoclonal (mAb) and monospecific affinity pure antibodies
Cutting edge: functional role for proline-rich tyrosine kinase 2 in NK cell-mediated natural cytotoxicity.
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Protein tyrosine kinase activation is one of the first biochemical events in the signaling pathway leading to activation of NK cell cytolytic machinery. Here we investigated whether proline-rich tyrosine kinase 2 (Pyk2), the nonreceptor protein tyrosine kinase belonging to the focal adhesion kinase
Protection from rabies by a vaccinia virus recombinant containing the rabies virus glycoprotein gene.
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Inoculation of rabbits and mice with a vaccinia-rabies glycoprotein recombinant (V-RG) virus resulted in rapid induction of high concentrations of rabies virus-neutralizing antibodies and protection from severe intracerebral challenge with several strains of rabies virus. Protection from virus
A temperature-sensitive lesion in the small subunit of the vaccinia virus-encoded mRNA capping enzyme causes a defect in viral telomere resolution.
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Using pulsed-field gel electrophoresis, we demonstrated that the temperature-sensitive (ts) conditional lethal mutant ts9383 is, at the nonpermissive temperature, defective in the resolution of concatemeric replicative intermediate DNA to linear 185-kb monomeric DNA genomes. The resolution defect
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