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Action of yeast killer factor: a resistant mutant with sensitive spheroplasts
Journal of Bacteriology
|March 1, 1973
Summary
Yeast killer factor proteins bind to cell walls, not inner cell structures, to exert their toxic effects. This binding to the yeast cell wall is crucial for the killer factor
Area of Science:
- Microbiology
- Molecular Biology
- Biochemistry
Background:
- Yeast killer factor (KF) proteins are secreted toxins.
- Killer-producing yeast strains are immune to their own KF.
- The mechanism of KF action and cell interaction is not fully understood.
Purpose of the Study:
- To investigate the binding sites and mechanism of yeast killer factor action.
- To determine the role of cell wall binding in KF toxicity.
- To characterize KF-resistant yeast mutants.
Main Methods:
- Binding studies using radioactive KF protein.
- Preparation and testing of yeast spheroplasts.
- Isolation and characterization of a KF-resistant mutant (R18).
Main Results:
- KF binds primarily to the yeast cell wall.
- Spheroplasts (lacking cell walls) bind minimal KF but remain sensitive.
- KF-resistant mutant cells do not bind KF but spheroplasts are sensitive.
- Cell wall binding sites are essential for KF activity in whole cells.
Conclusions:
- Yeast killer factor action requires binding to specific sites on the cell wall.
- Inner cell structures are not the primary targets for KF toxicity.
- The cell wall acts as a crucial interface for KF-mediated killing.