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J Virol. 1983 December; 48(3): 685-696

Physical mapping of the Fv-1 tropism host range determinant of BALB/c murine leukemia viruses.

ABSTRACT

The murine leukemia viruses (MuLVs) have different host ranges and were originally designated N-tropic and B-tropic if they replicated preferentially in vitro on NIH and BALB/c fibroblasts, respectively. It was later found that N-tropic MuLVs were in fact restricted in BALB/c cells, that B-tropic MuLVs were restricted in NIH cells, and that both viruses were restricted in (BALB X NIH) F1 cells. A single gene, Fv-1, with two alleles, Fv-1b and Fv-1n, determines this dominant restriction. A virus-encoded protein seems to carry the viral host range determinant which is recognized by the Fv-1 gene product. To map the viral DNA sequences encoding this determinant, we constructed viral DNA recombinants in vitro between the cloned infectious viral DNA genomes from BALB/c N-tropic and B-tropic MuLVs. Infectious recombinant MuLVs were recovered by microinjecting these recombinant DNAs into murine Fv-1- SC-1 cells and were subsequently tested in vitro for their host ranges (N- or B-tropic). We found that a short 302-base pair 5'-end fragment was necessary and sufficient to confer a specific host range to a recombinant. Our sequencing data revealed that this fragment codes for amino acid sequences in gag p30. They also showed that only two consecutive amino acid differences, Gln-ArgN- and Thr-GluB-, in p30 are responsible for the N- and B-tropic host ranges of the BALB/c MuLVs, respectively. Therefore, it appears that the Fv-1b and Fv-1n gene products can discriminate between these two p30 amino acid sequences.

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