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. 1984 Jan;49(1):214–222. doi: 10.1128/jvi.49.1.214-222.1984

Two base changes restore infectivity to a noninfectious molecular clone of Moloney murine leukemia virus (pMLV-1).

A D Miller, I M Verma
PMCID: PMC255444  PMID: 6197537

Abstract

The complete nucleotide sequence of a molecular clone of Moloney murine leukemia virus (pMLV-1) has previously been reported (Shinnick et al., Nature [London] 293:543-548, 1981). However, pMLV-1 does not generate infectious virus after transfection into cells (Berns et al., J. Virol. 36:254-263, 1980). The lesion in pMLV-1 has been localized by determining the biological activity of recombinants containing DNA from an infectious clone of Moloney murine leukemia virus (pMLV-48) and pMLV-1. Replacement of a 1.0-kilobase pair region which spans the gag-pol junction of pMLV-1 with the corresponding DNA fragment from the infectious clone restores its infectivity. Nucleotide sequence analysis of this fragment obtained from the infectious clone (pMLV-48) and pMLV-1 reveals two single base pair changes, one in the p30gag gene and the other in the 5' end of the pol gene. The mutation in the pol gene does not affect the production of infectious virus but renders them XC negative, whereas the mutation in the gag gene appears to be lethal. The complete nucleotide sequence of an infectious clone of Moloney murine leukemia virus can now be deduced.

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Selected References

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