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J Virol. 1988 February; 62(2): 633-636

Isolation of an integrated provirus of Moloney murine leukemia virus with long terminal repeats in inverted orientation: integration utilizing two U3 sequences.

Department of Biochemistry and Molecular Biophysics, Columbia University College of Physicians and Surgeons, New York, New York 10032.

ABSTRACT

We have previously described the construction of a mutant of Moloney murine leukemia virus, in594-2, which carries a 2-base-pair insertion in the U5 region of the genome and is partially defective in forming the integrated proviral DNA. We have now recovered a cloned copy of an unusual provirus from rat cells infected with this mutant. The viral genome is flanked by long terminal repeats in inverted orientation, with U3 sequences joined to cellular DNA at both of the outer edges. In addition, the provirus is a recombinant, containing a segment of a VL30 element in inverted orientation in place of the Moloney murine leukemia virus env region. The recovery of this provirus indicates that two U3 regions can be used for viral integration and suggests that there may be no absolute requirement in the reaction for those U5 sequences outside the 13-base-pair inverted repeats.

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