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Peyrefitte, Christophe N; Pastorino, Boris A. M; Grandadam, Marc; Rolland, Dominique; Tolou, Hugues J; Bessaud, Maël
Virus genes, 04/2007, Letnik: 34, Številka: 2Journal Article
Cell fusing agent virus (CFAV) is a positive strand RNA insect virus first isolated from a mosquito cell line. Based on viral morphology, phenotypic and phylogenetic studies, CFAV had been tentatively assigned to the genus Flavivirus (family Flaviviridae). The determination of the CFAV polyprotein complete sequence showed a putative serine protease domain analogue to the flaviviral NS2B/NS3 complex. This complex had been extensively studied, because it represented one of the main targets for antiflavivirus therapy development. We report herein the biochemical characterization of CFAV ΔNS2B-NS3pro protease complex. CFAV polyprotein sequence was computationally analysed to identify the amino-acid regions involved in protease activity. We designed, expressed and purified a catalytically active protease whose enzymatic properties were determined using fluorogenic substrates. Our results showed that, despite the low level of conservation of its amino-acid sequence, CFAV protease exhibited physico-chemical properties of other flaviviruses (high pH value requirement for optimal activity, inhibition by salt and preference for substrates featuring a basic residue at P₁ position).
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in: SICRIS
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