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Differential viral gene expression and its effect on the biological properties of the cell clones of an HIV-1-infected cell line

, : Differential viral gene expression and its effect on the biological properties of the cell clones of an HIV-1-infected cell line. Virology 177(1): 380-383

We have shown that 6D5 cells infected with the HIV-1 strain HTLV-III451 (6D5(451)) secreted viral envelope proteins gp160 and gp120 into the culture medium. Single cell cloning of 6D5(451) cells separated three distinct phenotypes. All clones secreted unprocessed env protein gp160 along with gp120. Only one phenotype produced infectious virus and contained normally processed gag proteins. The second phenotype was associated with nonproducer cells expressing only the env gene but no extracellular particles. The third phenotype synthesized Pr53gag but no reverse transcriptase, nor did it process the gag precursor. Only immature particles could be seen in the culture. Cells of the first and the third phenotypes produced two sizes of gp160, the normal and one with a small truncation at the C-terminus. Phenotype 2 only produced the smaller gp160. In all cases the gp160 that was secreted into the medium was the truncated molecule.


PMID: 2353462

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