AP-2 Is the Crucial Clathrin Adaptor Protein for CD4 Downmodulation by HIV-1 Nef in Infected Primary CD4+ T Cells |
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| Authors: | Marcos Vinicius Gondim Linda Wiltzer-Bach Brigitte Maurer Carina Banning Enrique Arganaraz Michael Schindler |
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| Affiliation: | aHelmholtz Zentrum Munich, Institute of Virology, Neuherberg, Germany;bHeinrich Pette Institute, Leibniz Institute for Experimental Virology, Hamburg, Germany;cInstitute of Medical Virology, University Clinic Tübingen, Tübingen, Germany;dUniversidade de Brasília, Laboratório de Virologia Molecular Faculdade de Ciências da Saúde, Brasília, Brazil |
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| Abstract: | HIV-1 Nef-mediated CD4 downmodulation involves various host factors. We investigated the importance of AP-1, AP-2, AP-3, V1H-ATPase, β-COP, and ACOT8 for CD4 downmodulation in HIV-1-infected short hairpin RNA (shRNA)-expressing CD4+ T cells and characterized direct interaction with Nef by Förster resonance energy transfer (FRET). Binding of lentiviral Nefs to CD4 and AP-2 was conserved, and only AP-2 knockdown impaired Nef-mediated CD4 downmodulation from primary T cells. Altogether, among the factors tested, AP-2 is the most important player for Nef-mediated CD4 downmodulation. |
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