title: Interaction of human immunodeficiency virus type 2 Vpx and invariant chain.
abstract: Vpx is a virion-associated protein of human immunodeficiency virus type 2 (HIV-2) and simian immunodeficiency viruses. The yeast two-hybrid system was used to identify invariant chain (Ii) as a cellular protein that interacts with HIV-2 Vpx. Vpx-Ii interaction was confirmed in cell-free reactions using bacterially expressed glutathione S-transferase fusion proteins and by coimmunoprecipitation in transfected and infected cells. In chronically infected cells expressing Vpx, Ii levels were markedly decreased, presumably due to enhanced degradation. These findings suggest that Vpx may disrupt major histocompatibility complex class II antigen presentation.
authors.affiliation: Department of Medicine, Pathology, and Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
authors.forename: H A
authors.initials: HA
authors.lastname: Pancio
authors.forename: N
authors.initials: N
authors.lastname: Vander Heyden
authors.forename: K
authors.initials: K
authors.lastname: Kosuri
authors.forename: P
authors.initials: P
authors.lastname: Cresswell
authors.forename: L
authors.initials: L
authors.lastname: Ratner
mesh_terms: D000944:Antigens, Differentiation, B-Lymphocyte / Q000235:genetics / Q000378:metabolism*; D001665:Binding Sites; D015498:HIV-2 / Q000276:immunology / Q000378:metabolism*; D006367:HeLa Cells; D000949:Histocompatibility Antigens Class II / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D009687:Nuclear Proteins; D012441:Saccharomyces cerevisiae; D015534:Trans-Activators / Q000235:genetics / Q000378:metabolism; D014162:Transfection; D020798:Two-Hybrid System Techniques; D054334:Viral Regulatory and Accessory Proteins / Q000235:genetics / Q000276:immunology / Q000378:metabolism*
chemical_list: D000944:Antigens, Differentiation, B-Lymphocyte; D000949:Histocompatibility Antigens Class II; C083728:MHC class II transactivator protein; D009687:Nuclear Proteins; D015534:Trans-Activators; C074286:VPX protein, Human immunodeficiency virus 2; D054334:Viral Regulatory and Accessory Proteins; C045084:invariant chain