Human topoisomerase I promotes HIV-1 proviral DNA synthesis: implications for the species specificity and cellular tropism of HIV-1 infection.

Journal Article (Journal Article)

Although HIV type 1 (HIV-1) cannot efficiently replicate in simian cells, the mechanism(s) involved in the restriction of virus tropism remain unclear. To investigate this, we have focused on the identification of human cellular factors that can influence the infectivity of HIV-1 derived from African green monkey producer cells. Whereas the infectivity of HIV-1 derived from such cells was only 10-15% of that of human cell-derived virus, expression of human topoisomerase I in the African green monkey cells resulted in a 5-fold increase of the infectivity of progeny HIV-1 virions. Replacement of glutamate-236 and asparagine-237 of human topoisomerase I with the corresponding residues (aspartate and serine, respectively) of the African green monkey enzyme abolished this enhancement of HIV-1 infectivity. This positive effect of human topoisomerase I expression in the African green monkey producer cells seemed to result from the promotion of HIV-1 cDNA synthesis. Thus, human topoisomerase I plays an important role in HIV-1 replication and infectivity, and differences in the species specificity of HIV-1 infection can at least in part be attributed to differences in topoisomerase I activities.

Full Text

Duke Authors

Cited Authors

  • Shoya, Y; Tokunaga, K; Sawa, H; Maeda, M; Ueno, T; Yoshikawa, T; Hasegawa, H; Sata, T; Kurata, T; Hall, WW; Cullen, BR; Takahashi, H

Published Date

  • July 8, 2003

Published In

Volume / Issue

  • 100 / 14

Start / End Page

  • 8442 - 8447

PubMed ID

  • 12829794

Pubmed Central ID

  • PMC166248

International Standard Serial Number (ISSN)

  • 0027-8424

Digital Object Identifier (DOI)

  • 10.1073/pnas.1430827100


  • eng

Conference Location

  • United States