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- W85386915 abstract "Dengue type 4 (DEN4) and other flaviviruses employ host and viral proteases for polyprotein processing. Most proteolytic cleavages in the DEN4 nonstructural protein (NS) region are mediated by the viral NS2B-NS3 protease. The N-terminal third of NS3, containing sequences homologous to serine protease active sites, is the protease domain. To determine required sequences in NS2B, deletions were introduced into DEN4 NS2B-30% NS3 cDNA and the expressed polyproteins assayed for self-cleavage. A 40 amino acid segment within NS2B was essential. Sequence analysis of NS2B predicts that this segment constitutes a hydrophilic domain surrounded by hydrophobic regions. Hydrophobicity profiles of other flavivirus NS2Bs show similar patterns. Cleavage of DEN4 NS1-NS2A requires an octapeptide sequence at the NS1 C terminus and downstream NS2A. Comparison of the analogous octapeptide sequences among flaviviruses indicates a consensus cleavage sequence of (P8)/Met/Leu-Val-Xaa-Ser-Xaa-Val-Ala(P1), where Xaa are non-conserved amino acids. The effects on cleavage of amino acid substitutions in this consensus sequence were analyzed. Most substitutions of the conserved residues interfered with cleavage, whereas substitutions of non-conserved residues had little or no effect. These findings indicate that the responsible enzyme recognizes well-defined sequences at the cleavage site." @default.
- W85386915 created "2016-06-24" @default.
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- W85386915 date "1994-01-01" @default.
- W85386915 modified "2023-09-27" @default.
- W85386915 title "Processing of dengue type 4 and other flavivirus nonstructural proteins" @default.
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- W85386915 doi "https://doi.org/10.1007/978-3-7091-9326-6_36" @default.
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