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One of these strategies is the direct cell-to-cell spread of HIV-1. The formation of a virological synapse (VS) between donor and target cell is important for this process. Tetraspanins are cellular proteins that are actively involved in the formation of a VS. However, the molecular mechanisms of recruiting host proteins for the cell\u2013cell transfer of particles to the VS remains unclear. Our study has mapped the binding site for the transmembrane envelope protein gp41 of HIV-1 within the large extracellular loop (LEL) of CD63 and showed that this interaction occurs predominantly at the VS between T cells where viral particles are transferred. Mutations within the highly conserved CCG motif of the tetraspanin superfamily abrogated recruiting of expressed HIV-1 GFP fused Gag core protein and CD63 to the VS. This demonstrates the biological significance of CD63 for enhanced formation of a VS. Since cell\u2013cell spread of HIV-1 is a major route of persistent infection, these results highlight the central role of CD63 as a member of the tetraspanin superfamily during HIV-1 infection and pathogenesis.<\/jats:p>","DOI":"10.1038\/s41598-021-89523-7","type":"journal-article","created":{"date-parts":[[2021,5,11]],"date-time":"2021-05-11T10:09:20Z","timestamp":1620727760000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["The large extracellular loop of CD63 interacts with gp41 of HIV-1 and is essential for establishing the virological synapse"],"prefix":"10.1038","volume":"11","author":[{"given":"Daniel","family":"Ivanusic","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kazimierz","family":"Madela","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Norbert","family":"Bannert","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joachim","family":"Denner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,5,11]]},"reference":[{"key":"89523_CR1","doi-asserted-by":"publisher","first-page":"643","DOI":"10.1111\/j.1600-0854.2004.00209.x","volume":"5","author":"C Jolly","year":"2004","unstructured":"Jolly, C. & Sattentau, Q. 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