The host-cell restriction factor SERINC5 restricts HIV-1 infectivity without altering the lipid composition and organization of viral particles
The host-cell restriction factor SERINC5 potently suppresses the infectivity of HIV, type 1 (HIV-1) particles, and is counteracted by the viral pathogenesis factor Nef. However, the molecular mechanism by which SERINC5 restricts HIV-1 particle infectivity is still unclear. Because SERINC proteins ha...
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| Hauptverfasser: | , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
June 28, 2017
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| In: |
The journal of biological chemistry
Year: 2017, Jahrgang: 292, Heft: 33, Pages: 13702-13713 |
| ISSN: | 1083-351X |
| DOI: | 10.1074/jbc.M117.797332 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1074/jbc.M117.797332 Verlag, kostenfrei, Volltext: http://www.jbc.org/content/292/33/13702 
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| Verfasserangaben: | Birthe Trautz, Hannah Wiedemann, Christian Lüchtenborg, Virginia Pierini, Jan Kranich, Bärbel Glass, Hans-Georg Kräusslich, Thomas Brocker, Massimo Pizzato, Alessia Ruggieri, Britta Brügger, and Oliver T. Fackler |
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| 245 | 1 | 4 | |a The host-cell restriction factor SERINC5 restricts HIV-1 infectivity without altering the lipid composition and organization of viral particles |c Birthe Trautz, Hannah Wiedemann, Christian Lüchtenborg, Virginia Pierini, Jan Kranich, Bärbel Glass, Hans-Georg Kräusslich, Thomas Brocker, Massimo Pizzato, Alessia Ruggieri, Britta Brügger, and Oliver T. Fackler |
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| 520 | |a The host-cell restriction factor SERINC5 potently suppresses the infectivity of HIV, type 1 (HIV-1) particles, and is counteracted by the viral pathogenesis factor Nef. However, the molecular mechanism by which SERINC5 restricts HIV-1 particle infectivity is still unclear. Because SERINC proteins have been suggested to facilitate the incorporation of serine during the biosynthesis of membrane lipids and because lipid composition of HIV particles is a major determinant of the infectious potential of the particles, we tested whether SERINC5-mediated restriction of HIV particle infectivity involves alterations of membrane lipid composition. We produced and purified HIV-1 particles from SERINC5293T cells with very low endogenous SERINC5 levels under conditions in which ectopically expressed SERINC5 restricts HIV-1 infectivity and is antagonized by Nef and analyzed both virions and producer cells with quantitative lipid MS. SERINC5 restriction and Nef antagonism were not associated with significant alterations in steady-state lipid composition of producer cells and HIV particles. Sphingosine metabolism kinetics were also unaltered by SERINC5 expression. Moreover, the levels of phosphatidylserine on the surface of HIV-1 particles, which may trigger uptake into non-productive internalization pathways in target cells, did not change upon expression of SERINC5 or Nef. Finally, saturating the phosphatidylserine-binding sites on HIV target cells did not affect SERINC5 restriction or Nef antagonism. These results demonstrate that the restriction of HIV-1 particle infectivity by SERINC5 does not depend on alterations in lipid composition and organization of HIV-1 particles and suggest that channeling serine into lipid biosynthesis may not be a cardinal cellular function of SERINC5. | ||
| 650 | 4 | |a host cell restriction factor | |
| 650 | 4 | |a host-pathogen interaction | |
| 650 | 4 | |a human immunodeficiency virus (HIV) | |
| 650 | 4 | |a infectious disease | |
| 650 | 4 | |a lipid | |
| 650 | 4 | |a lipid composition | |
| 650 | 4 | |a Nef | |
| 650 | 4 | |a SERINC5 | |
| 650 | 4 | |a viral protein | |
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