title: Mutations in CypA Binding Region of HIV-1 Capsid Affect Capsid Stability and Viral Replication in Primary Macrophages.
abstract: Mutations in the cyclophilin A (CypA) binding region in the HIV-1 capsid affect their dependency on the known HIV-1 cofactor CypA and allow escape from the HIV-1 restriction factor Trim5α in human and simian cells. Here we study the effect of these mutations in the CypA binding region of capsid on cofactor binding, capsid destabilization, and viral replication in primary cells. We showed that the viral capsid with mutations in the CypA binding region (CypA-BR) interacted efficiently with CypA, but had an increased stability upon infection as compared to the wild-type capsid. Interestingly, the wild-type virus was able to infect monocyte-derived macrophages (MDM) more efficiently as compared to the CypA-BR mutant variant. The lower infectivity of the CypA-BR mutant virus in MDM was associated with lower levels of reverse transcription products. Similar to the wild-type virus, the CypA-BR mutant variant was unable to induce a strong innate response in primary macrophages. These data demonstrate that mutations in the CypA binding site of the capsid resulted in higher capsid stability and hampered infectivity in macrophages.
authors.affiliation: Laboratory of Viral Immune Pathogenesis, Department of Experimental Immunology, Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, University of Amsterdam , Amsterdam, the Netherlands .
authors.forename: Laurentia C
authors.initials: LC
authors.lastname: Setiawan
authors.affiliation: Laboratory of Viral Immune Pathogenesis, Department of Experimental Immunology, Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, University of Amsterdam , Amsterdam, the Netherlands .
authors.forename: Karel A
authors.initials: KA
authors.lastname: van Dort
authors.affiliation: Laboratory of Viral Immune Pathogenesis, Department of Experimental Immunology, Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, University of Amsterdam , Amsterdam, the Netherlands .
authors.forename: Maarten A N
authors.initials: MA
authors.lastname: Rits
authors.affiliation: Laboratory of Viral Immune Pathogenesis, Department of Experimental Immunology, Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, University of Amsterdam , Amsterdam, the Netherlands .
authors.forename: Neeltje A
authors.initials: NA
authors.lastname: Kootstra
mesh_terms: D001665:Binding Sites; D002478:Cells, Cultured; D021984:Cyclophilin A / Q000378:metabolism*; D015497:HIV-1 / Q000235:genetics / Q000502:physiology*; D006801:Humans; D008264:Macrophages / Q000821:virology*; D009154:Mutation; D011485:Protein Binding; D014779:Virus Replication; D054301:gag Gene Products, Human Immunodeficiency Virus / Q000235:genetics / Q000378:metabolism*
chemical_list: D054301:gag Gene Products, Human Immunodeficiency Virus; D021984:Cyclophilin A