DOI: 10.1128/jvi.77.11.6507-6519.2003. Defects in Human Immunodeficiency Virus Budding and Endosomal Sorting Induced by TSG101 Overexpression

Defects in Human Immunodeficiency Virus Budding and Endosomal Sorting Induced by TSG101 Overexpression

10.1128/jvi.77.11.6507-6519.2003

Crossref journal-article

American Society for Microbiology

Journal of Virology (235)

Abstract

ABSTRACT Retrovirus budding is greatly stimulated by the presence of Gag sequences known as late or L domains. The L domain of human immunodeficiency virus type 1 (HIV-1) maps to a highly conserved Pro-Thr-Ala-Pro (PTAP) sequence in the p6 domain of Gag. We and others recently observed that the p6 PTAP motif interacts with the cellular endosomal sorting protein TSG101. Consistent with a role for TSG101 in virus release, we demonstrated that overexpressing the N-terminal, Gag-binding domain of TSG101 (TSG-5′) suppresses HIV-1 budding by blocking L domain function. To elucidate the role of TSG101 in HIV-1 budding, we evaluated the significance of the binding between Gag and TSG-5′ on the inhibition of HIV-1 release. We observed that a mutation in TSG-5′ that disrupts the Gag/TSG101 interaction suppresses the ability of TSG-5′ to inhibit HIV-1 release. We also determined the effect of overexpressing a panel of truncated TSG101 derivatives and full-length TSG101 (TSG-F) on virus budding. Overexpressing TSG-F inhibits HIV-1 budding; however, the effect of TSG-F on virus release does not require Gag binding. Furthermore, overexpression of the C-terminal portion of TSG101 (TSG-3′) potently inhibits budding of not only HIV-1 but also murine leukemia virus. Confocal microscopy data indicate that TSG-F and TSG-3′ overexpression induces an aberrant endosome phenotype; this defect is dependent upon the C-terminal, Vps-28-binding domain of TSG101. We propose that TSG-5′ suppresses HIV-1 release by binding PTAP and blocking HIV-1 L domain function, whereas overexpressing TSG-F or TSG-3′ globally inhibits virus release by disrupting the cellular endosomal sorting machinery. These results highlight the importance of TSG101 and the endosomal sorting pathway in virus budding and suggest that inhibitors can be developed that, like TSG-5′, target HIV-1 without disrupting endosomal sorting.

Bibliography

Goila-Gaur, R., Demirov, D. G., Orenstein, J. M., Ono, A., & Freed, E. O. (2003). Defects in Human Immunodeficiency Virus Budding and Endosomal Sorting Induced by TSG101 Overexpression. Journal of Virology, 77(11), 6507â6519.

Authors 5

Ritu Goila-Gaur (first)
Dimiter G. Demirov (additional)
Jan M. Orenstein (additional)
Akira Ono (additional)
Eric O. Freed (additional)

References 64 Referenced 84

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Dates

Type	When
Created	22 years, 3 months ago (May 12, 2003, 6:33 p.m.)
Deposited	3 years, 5 months ago (March 5, 2022, 2:49 a.m.)
Indexed	11 months, 3 weeks ago (Aug. 27, 2024, 2:29 p.m.)
Issued	22 years, 2 months ago (June 1, 2003)
Published	22 years, 2 months ago (June 1, 2003)
Published Print	22 years, 2 months ago (June 1, 2003)

Funders 0

None

BibTeX

@article{Goila_Gaur_2003, title={Defects in Human Immunodeficiency Virus Budding and Endosomal Sorting Induced by TSG101 Overexpression}, volume={77}, ISSN={1098-5514}, url={http://dx.doi.org/10.1128/jvi.77.11.6507-6519.2003}, DOI={10.1128/jvi.77.11.6507-6519.2003}, number={11}, journal={Journal of Virology}, publisher={American Society for Microbiology}, author={Goila-Gaur, Ritu and Demirov, Dimiter G. and Orenstein, Jan M. and Ono, Akira and Freed, Eric O.}, year={2003}, month=jun, pages={6507–6519} }

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