title: Isolation of Mycoplasma pulmonis membranes and identification of surface antigens.
abstract: Labeling of Mycoplasma pulmonis cells by iodination with the Bolton-Hunter reagent was shown to efficiently label membrane-associated proteins without significant loss of viability. Labeled proteins proven to be surface exposed by differential proteolytic digestion were analyzed by autoradiography of two-dimensional polyacrylamide gel electrophoresis (PAGE), and seven labeled major polypeptides were identified. To identify all the membrane-associated antigens, pure membranes were isolated by using the surface-labeled proteins as markers. Analysis of the isolated membranes by autoradiography of both sodium dodecyl sulfate-PAGE and the two-dimensional PAGE indicated that the labeled surface proteins were retained in the pure membranes; by immunoblotting with sera from naturally infected animals, these surface proteins were shown to be the predominant antigens recognized by the host during natural infection.
mesh_terms: D000942:Antigens, Bacterial / Q000302:isolation & purification*; D000954:Antigens, Surface / Q000302:isolation & purification*; D002458:Cell Fractionation / Q000379:methods; D008565:Membrane Proteins / Q000276:immunology / Q000302:isolation & purification; D008566:Membranes / Q000276:immunology; D009174:Mycoplasma / Q000032:analysis / Q000276:immunology*
chemical_list: D000942:Antigens, Bacterial; D000954:Antigens, Surface; D008565:Membrane Proteins