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• W2079843900 abstract "Retroviral Gag protein is sufficient to produce Gag virus-like particles when expressed in higher eukaryotic cells. Here we describe the in vitro assembly reaction of human immunodeficiency virus Gag protein, which consists of two sequential steps showing the optimal conditions for each reaction. Following expression and purification, Gag protein lacking only the C-terminal p6 domain was present as a monomer (50 kDa) by velocity sedimentation analysis. Initial assembly of the Gag protein to 60 S intermediates occurred by dialysis at 4 °C in low salt at neutral to alkaline pH. However, higher order of assembly required incubation at 37 °C and was facilitated by the addition of Mg2+. Prolonged incubation under these conditions produced complete assembly (600 S), equivalent to Gag virus-like particles obtained from Gag-expressing cells. Neither form disassembled by treatment with nonionic detergent, suggesting that correct assembly might occur in vitro. Electron microscopic observation confirmed that the 600 S assembly products were spherical particles similar to authentic immature human immunodeficiency virus particles. The latter assembly stage but not the former was accelerated by the addition of RNA although not inhibited by RNaseA treatment. These results suggest that Gag protein alone assembles in vitro, but that additional RNA facilitates the assembly reaction." @default.
• W2079843900 created "2016-06-24" @default.
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• W2079843900 date "1999-09-01" @default.
• W2079843900 modified "2023-09-29" @default.
• W2079843900 title "In Vitro Assembly of Human Immunodeficiency Virus Type 1 Gag Protein" @default.
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• W2079843900 doi "https://doi.org/10.1074/jbc.274.39.27997" @default.
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