Contribution of MxB oligomerization to HIV-1 capsid binding and restriction

Cindy Buffone, Bianca Schulte, Silvana Opp, Felipe Diaz-Griffero

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


The alpha interferon (IFN-α)-inducible restriction factor myxovirus B (MxB) blocks HIV-1 infection after reverse transcription but prior to integration. MxB binds to the HIV-1 core, which is composed of capsid protein, and this interaction leads to inhibition of the uncoating process of HIV-1. Previous studies suggested that HIV-1 restriction by MxB requires binding to capsid. This work tests the hypothesis that MxB oligomerization is important for the ability of MxB to bind to the HIV-1 core. For this purpose, we modeled the structure of MxB using the published tertiary structure of MxA. The modeled structure of MxB guided our mutagenic studies and led to the discovery of several MxB variants that lose the capacity to oligomerize. In agreement with our hypothesis, MxB variants that lost the oligomerization capacity also lost the ability to bind to the HIV-1 core. MxB variants deficient for oligomerization were not able to block HIV-1 infection. Overall, our work showed that oligomerization is required for the ability of MxB to bind to the HIV-1 core and block HIV-1 infection.

Original languageEnglish (US)
Pages (from-to)3285-3294
Number of pages10
JournalJournal of virology
Issue number6
StatePublished - 2015

ASJC Scopus subject areas

  • Microbiology
  • Immunology
  • Insect Science
  • Virology


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