title: Slight difference in primary amino acid sequence of p17 matrix protein of HIV-1 exerts profound influence on its antigenicity.
abstract: HIV-1 p17 antigen has been studied for its biological significance in vitro as well as its immunological roles in vivo. By immunological approach of antibody-binding to HIV-1 p17 antigens of several subtypes in combination with computerized analysis of those tertial structures, it became evident that, irrelevant of similarity of linear amino acid sequence of different HIV-1 subtypes, a few amino acid substitutions close to or distant from specified epitope(s) affected their tertial structure resulting in change in ability of its binding to selected antibody. ELISA employing two monoclonal antibodies, A144 and C415, could detect p17 of subtypes A and B, but not of subtypes C, D, and E. Since the epitope site corresponding to A144 has been reported to be important for biological activity of p17 of HIV-1, change in tertial structure around this epitope may explain some difference in biology of HIV-1, such as infectivity of subtypes B and E.
authors.affiliation: Research Institute for Microbial Diseases, Osaka University, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Taniguchi
authors.forename: H
authors.initials: H
authors.lastname: Tsuchie
authors.forename: S
authors.initials: S
authors.lastname: Kageyama
authors.forename: M
authors.initials: M
authors.lastname: Iwasaki
authors.forename: T
authors.initials: T
authors.lastname: Takagi
authors.forename: F
authors.initials: F
authors.lastname: Sasao
authors.forename: S
authors.initials: S
authors.lastname: Ueda
authors.forename: T
authors.initials: T
authors.lastname: Kurimura
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal; D001665:Binding Sites; D004797:Enzyme-Linked Immunosorbent Assay; D018604:Epitope Mapping; D000939:Epitopes / Q000737:chemistry / Q000235:genetics; D015683:Gene Products, gag / Q000737:chemistry / Q000235:genetics* / Q000276:immunology*; D015483:HIV Antibodies; D015488:HIV Antigens / Q000737:chemistry / Q000235:genetics* / Q000276:immunology*; D015497:HIV-1 / Q000145:classification / Q000235:genetics* / Q000276:immunology*; D006801:Humans; D051379:Mice; D008958:Models, Molecular; D008969:Molecular Sequence Data; D011487:Protein Conformation; D017434:Protein Structure, Tertiary; D014764:Viral Proteins; D014774:Virulence / Q000276:immunology; D054301:gag Gene Products, Human Immunodeficiency Virus
chemical_list: D000911:Antibodies, Monoclonal; D000939:Epitopes; D015683:Gene Products, gag; D015483:HIV Antibodies; D015488:HIV Antigens; D014764:Viral Proteins; D054301:gag Gene Products, Human Immunodeficiency Virus; C054858:p17 protein, Human Immunodeficiency Virus Type 1