1887

Abstract

Antibody from BALB/cByJ mice immunized against a membranous fraction of agglutinated whole cells as well as the membranous fraction. Hybridoma techniques were used to isolate an IgM monoclonal antibody (mAb) designated 10G which agglutinated whole cells and reacted with the subcellular fraction. Yeast cells of 15 additional strains and isolates of and were also agglutinated by mAb 10G. The antigen was not detected on other fungi, including spp. and To determine the cellular location of the epitope to which mAb 10G is specific, freeze-substitution was compared with traditional chemical fixation methods in preparation of samples for immunocolloidal gold electron microscopy (IEM). With both fixation procedures, the antigen recognized by mAb 10G was found randomly and densely concentrated on the plasma membrane on exponential-phase yeast-form cells and had a patchy distribution on the cell wall surface. Association of the antigen with the plasma membrane was confirmed by IEM of isolated membranes. On developing hyphal cells, antigen appeared first on the plasma membrane and later on the cell wall surface. Treatment of yeast cells with -mercaptoethanol and Zymolyase before fixation removed the antigen from the surface but left the cytoplasmic antigen undisturbed. Treatment of yeast cells or solubilized antigen with heat or proteolytic enzymes (trypsin, Pronase B, proteinase K) did not remove or destroy the antigen, suggesting a non-protein nature of the epitope.

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1991-03-01
2021-04-21
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