title: Characterization of a monoclonal antibody (RJ5) against the immunodominant 41-kD antigen of Candida albicans.
abstract: A 41-kD component of Candida albicans was identified to be the major antigen radioimmunoprecipitated by antibodies with increased titers in the sera of patients with invasive candidiasis. A mouse monoclonal antibody (RJ5) was generated which, by immunoblotting, showed positive reactivity to the immunoprecipitated 41-kD component. By two-dimensional gel electrophoresis and immunoblotting, MoAb RJ5 was shown to react with different isoforms of the 41-kD component with pI values from 6.1 to 6.9. Furthermore, MoAb RJ5 showed positive reactivity to cytoplasmic antigens of C. albicans by frozen section and immunoperoxidase staining. By SDS-polyacrylamide gel electrophoresis and immunoblotting, MoAb RJ5 showed no cross-reactivity to antigens of Candida tropicalis and Candida parapsilosis. The epitope of the 41-kD molecule recognized by MoAb RJ5 was susceptible to treatment of proteinase K at concentrations of greater than or equal to 5 micrograms/ml, and was relatively resistant to periodate oxidation with concentration of NaIO4 up to 20 mM. This MoAb may be useful in the purification and characterization of the immunodominant 41-kD antigen of C. albicans, and as a probe in the detection of Candida antigens in the sera of patients with invasive candidiasis.
authors.affiliation: Department of Medical Research, Veterans General Hospital, Taipei, Taiwan.
authors.forename: H D
authors.initials: HD
authors.lastname: Shen
authors.forename: K B
authors.initials: KB
authors.lastname: Choo
authors.forename: K W
authors.initials: KW
authors.lastname: Yu
authors.forename: W L
authors.initials: WL
authors.lastname: Ling
authors.forename: F C
authors.initials: FC
authors.lastname: Chang
authors.forename: S H
authors.initials: SH
authors.lastname: Han
mesh_terms: D000906:Antibodies / Q000032:analysis; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000917:Antibody Formation; D000946:Antigens, Fungal / Q000276:immunology*; D002176:Candida albicans / Q000276:immunology*; D002177:Candidiasis / Q000276:immunology; D015180:Electrophoresis, Gel, Two-Dimensional; D006801:Humans; D015151:Immunoblotting; D016056:Immunodominant Epitopes / Q000276:immunology*; D008970:Molecular Weight; D011233:Precipitin Tests
chemical_list: D000906:Antibodies; D000911:Antibodies, Monoclonal; D000946:Antigens, Fungal; D016056:Immunodominant Epitopes