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J Virol. 1992 February; 66(2): 615-622

Defects in Moloney murine leukemia virus replication caused by a reverse transcriptase mutation modeled on the structure of Escherichia coli RNase H.

A Telesnitsky, S W Blain and S P Goff

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

ABSTRACT

We have studied a mutant Moloney murine leukemia virus with a deletion in reverse transcriptase (RT) which is predicted to make its RNase H domain resemble structurally that of human immunodeficiency virus RT. This deletion was based on improved RNase H homology alignments made possible by the recently solved three-dimensional structure for Escherichia coli RNase H. This mutant Moloney murine leukemia virus RT was fully active in the oligo(dT)-poly(rA) DNA polymerase assay and retained nearly all of wild-type RT's RNase H activity in an in situ RNase H gel assay. However, proviruses reconstructed to include this deletion were noninfectious. Minus-strand strong-stop DNA was made by the deletion mutant, but the amount of minus-strand translocation was intermediate to the very low level measured with RNase H-null virions and the high level seen with wild-type RT. The average length of translocated minus-strand DNA was shorter for the deletion mutant than for wild type, suggesting that mutations in the RNase H domain of RT also affect DNA polymerase activity.

J Virol. 1992 February; 66(2): 615-622




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