title: Immunological cross-reactivity of fungal and yeast plasma membrane H+-ATPase.
abstract: The plasma membrane H+-ATPases from fungi and yeasts have similar catalytic and molecular properties. A structural comparison has been performed using immunoblot analysis with polyclonal antibodies directed toward the 102 kDa polypeptide of the plasma membrane H+-ATPase from Neurospora crassa. A strong cross-reactivity is observed between the fungal H+-ATPase and the enzyme from the yeasts Saccharomyces cerevisiae and Schizosaccharomyces pombe. Structural homologies are indicated also by the analysis of the cross-reactive peptides originated by proteolytic digestion of Neurospora and S. cerevisiae purified enzymes. Neither enzyme from these two sources appears to be glycosylated by a highly sensitive concanavalin A affinity assay on blotted proteins. A glycoprotein of Mr 115000 and pI 4.8-5, which comigrates with a cell cycle-modulated protein on 2D gel, is present in partially purified preparations of plasma membrane H+-ATPase of S. cerevisiae and it is shown to be structurally unrelated to H+-ATPase.
mesh_terms: D002462:Cell Membrane / Q000201:enzymology; D003101:Collodion; D004591:Electrophoresis, Polyacrylamide Gel; D000939:Epitopes / Q000276:immunology; D007158:Immunologic Techniques; D007526:Isoelectric Point; D008970:Molecular Weight; D009491:Neurospora / Q000201:enzymology*; D009492:Neurospora crassa / Q000201:enzymology*; D006180:Proton-Translocating ATPases / Q000276:immunology*; D012441:Saccharomyces cerevisiae / Q000201:enzymology*
chemical_list: D000939:Epitopes; D003101:Collodion; D006180:Proton-Translocating ATPases