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J Virol. 1980 February; 33(2): 845-855

Molecular cloning of the Harvey sarcoma virus circular DNA intermediates. II. Further structural analyses.

ABSTRACT

Three species of unintegrated supercoiled Harvey sarcoma virus DNA (6.6, 6.0, and 5.4 kilobase pairs) have been molecularly cloned from Harvey sarcoma virus-infected cells. On the basis of restriction enzyme analyses, the 6.6- and 6.0-kilobase pair viral DNAs contain two and one copies, respectively, of a 650-base pair DNA segment which contains sequences present at the 3' and 5' termini of the viral genome. R-loop structures formed between Moloney leukemia virus RNA and the cloned Harvey sarcoma virus DNA indicated that about 500 base pairs of the 650-base pair repeating segment was complementary to the 3' end of the viral RNA. During amplification in the Escherichia coli host, some recombinants containing the 6.6- or the 6.0-kilobase pair Harvey sarcoma virus DNA insert acquired or lost the complete 650-base pair DNA segment. These changes occurred in both recA+ and recA- E. coli.

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