title: Factors affecting the susceptibility of sensitive yeast cells to killer toxin K1.
abstract: Optimum conditions for action of the killer toxin K1 on sensitive strain S. cerevisiae S6 were established. Maximum killing was reached in a very narrow pH range of 4.5-4.6. Maximum susceptibility to toxin was displayed by highly energized fresh cells from the early exponential phase in the presence of an external energy source (at least 200 mmol/L glucose). Further, maintenance of maximum membrane potential was necessary for killer action, as documented by decreasing toxin activity in the presence of increasing concentrations of KCl. The killing was strongly stimulated in the presence of millimolar concentrations of Ca2+ and Mg2+.
authors.affiliation: Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague.
authors.forename: H
authors.initials: H
authors.lastname: Kurzweilová
authors.forename: K
authors.initials: K
authors.lastname: Sigler
mesh_terms: D002118:Calcium / Q000494:pharmacology; D004352:Drug Resistance, Microbial; D004734:Energy Metabolism; D006863:Hydrogen-Ion Concentration; D055646:Killer Factors, Yeast; D008274:Magnesium / Q000494:pharmacology; D009183:Mycotoxins / Q000633:toxicity*; D011189:Potassium Chloride / Q000494:pharmacology; D012441:Saccharomyces cerevisiae / Q000187:drug effects* / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins
chemical_list: D055646:Killer Factors, Yeast; D009183:Mycotoxins; D029701:Saccharomyces cerevisiae Proteins; D011189:Potassium Chloride; D008274:Magnesium; D002118:Calcium