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Journal of Virology, October 1999, p. 8448-8456, Vol. 73, No. 10
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Decreased Processivity of Human Immunodeficiency Virus Type 1 Reverse Transcriptase (RT) Containing Didanosine-Selected Mutation Leu74Val: a Comparative Analysis of RT Variants Leu74Val and Lamivudine-Selected Met184Val

Prem L. Sharma* and Clyde S. Crumpacker

Division of Infectious Disease, Beth Israel Deaconess Medical Center, Boston, Massachusetts 02215

Received 1 February 1999/Accepted 12 July 1999

We previously showed that a didanosine-selected mutation in pNL4-3 background conferred a replication disadvantage on human immunodeficiency virus type 1, resulting in a loss of replication fitness. This work has been extended by showing that a recombinant virus with the HXBc2 backbone and reverse transcriptase (RT) fragments from pNL4-3 containing the Leu74Val mutation produce decreasing amounts of p24 antigen over a 3-week period. The HXBc2 recombinant containing the wild-type RT from pNL4-3 replicated efficiently. When the virion-associated RT containing the Leu74Val mutation was used in an RT processivity assay with homopolymer RNA template-primer, poly(A), and oligo(dT), the RT with altered Leu74Val mutation was less processive, generating fewer cDNA products in comparison to wild-type pNL4-3 RT. The replication kinetics and RT processivity of the mutant with the Leu74Val mutation were compared to those of a lamivudine-selected mutant Met184Val. In replication kinetics assays, mutant Leu74Val replicated slower than the mutant Met184Val. In a processivity assay, the mutant RTs from both viruses show comparable decreases in processivity. These observations provide biochemical evidence of decreased processivity to support the decrease in replication fitness observed with the Leu74Val or Met184Val mutations.

* Corresponding author. Mailing address: Division of Infectious Disease, Beth Israel Deaconess Medical Center, 330 Brookline Ave., Boston, MA 01225. Phone: (617) 667-4355. Fax: (617) 667-5541. E-mail: psharma{at}caregroup.harvard.edu.

Journal of Virology, October 1999, p. 8448-8456, Vol. 73, No. 10
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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