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• W2137401529 abstract "Retroviruses are unusual in that expression of a single protein, Gag, leads to budding of virus-like particles into the extracellular space. We have developed conditions under which virus-like particles are formed spontaneously in vitro from fragments of Rous sarcoma virus (RSV) Gag protein purified after expression in Escherichia coli. The CA-NC fragment of Gag was shown previously to assemble into hollow cylinders (S. Campbell and V. M. Vogt, J. Virol. 69:6487-6497, 1995). We have now extended these studies to larger Gag proteins. In every case examined, assembly into regular structures required RNA. A nearly full-length Gag missing only the C-terminal PR domain, as well as similar proteins missing in addition the N-terminal half of MA, the C-terminal half of MA, the entire MA sequence, or the entire p2 sequence, all assembled into spherical particles resembling RSV in size. By contrast, proteins missing p10 assembled into cylindrical particles like those formed by CA-NC alone. Thin section electron microscopy showed that each of these Gag proteins formed in the expressing E. coli cells particles similar in shape to those seen in vitro. We conclude from these results that neither the sequences required for membrane binding in vivo, near the N terminus of Gag, nor the sequences required for a late step in budding, in the p2 portion of Gag, are essential for formation of virus-like particles in this system. Furthermore, we postulate the existence of a shape-determining sequence in p10, which provides or facilitates interactions required for the growing particle to be constrained to a spherical shape." @default.
• W2137401529 created "2016-06-24" @default.
• W2137401529 creator A5048812479 @default.
• W2137401529 creator A5088660634 @default.
• W2137401529 date "1997-06-01" @default.
• W2137401529 modified "2023-10-14" @default.
• W2137401529 title "In vitro assembly of virus-like particles with Rous sarcoma virus Gag deletion mutants: identification of the p10 domain as a morphological determinant in the formation of spherical particles" @default.
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• W2137401529 doi "https://doi.org/10.1128/jvi.71.6.4425-4435.1997" @default.
• W2137401529 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/191661" @default.
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• W2137401529 hasPublicationYear "1997" @default.
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