Killer Toxins
Mostrando 1-12 de 23 artigos, teses e dissertações.
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1. Role of killer factors in the inhibitory activity of bio-control yeasts against Penicillium expansum and Aspergillus ochraceus
This work evaluated the antagonism of killer positive yeast strains (isolated from 11 samples of different frozen fruit pulps) against the strains of Penicillium expansum and Aspergillus ochraceus. Of the total 41 killer yeasts tested in YM agar, 19 showed antibiosis against P. expansum and A. ochraceus, with inhibition zone ranging from 10 to 18 mm and 10 t
Braz. arch. biol. technol.. Publicado em: 2013-08
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2. Modulação de eventos da imunidade humoral e celular por venenos brutos e componentes dos venenos de Bothrops jararacussu e Bothrops pirajai / Modulation of events of humoral and cellular immunity by crude venom and components of Bothrops jararacussu and Bothrops pirajai
Snakes of the genus Bothrops are responsible for 90% of snakebites in Brazil. Their venoms cause local effects in humans and animals, such as hemorrhage, edema, pain and necrosis, characteristic of an inflammatory response. The mechanism is not well defined. These effects are related to the combined action of proteases, substances that induce bleeding and ph
Publicado em: 2010
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3. Adhesion, exoenzymes activity, susceptibility to Killer toxins and sensibility to antifungal agents of Candida dubliniensis strains isolates from HIV+ individuals / Adesão, produção de exoenzimas, sensibilidade a toxinas Killer e a antifúngicos de cepas de Candida dubliniensis isoladas de pacientes HIV positivos
Candida dubliniensis is a newly described specie which is closely related phylogenetically to Candida albicans. It was first identified as a new specie by Sullivan et al., in Dublin, Ireland, 1995.Numerous researches are attempting to identify more detailed characteristics of C. dubliniensis and similitudes and differences between the two related species.The
Publicado em: 2006
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4. Biotyping of industrial yeasts by the Killer system. / Biotipagem de leveduras industriais através do sistema Killer.
Agriculture is an important sector in the economy of Brazil. The sugar cane occupies 9% of the cultivated area in this country. The most important products from the sugar cane industry are sugar and alcohol, the latest produced by fermentative process by yeasts. During the fermentation the yeast population changes due to the interferences coming from the sug
Publicado em: 2004
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5. Ustilago maydis KP6 killer toxin: structure, expression in Saccharomyces cerevisiae, and relationship to other cellular toxins.
There are a number of yeasts that secrete killer toxins, i.e., proteins lethal to sensitive cells of the same or related species. Ustilago maydis, a fungal pathogen of maize, also secretes killer toxins. The best characterized of the U. maydis killer toxins is the KP6 toxin, which consists of two small polypeptides that are not covalently linked. In this wor
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6. Yeast killer toxins and dimorphism.
The differential action of four selected yeast killer toxins on the mycelial and yeast forms of four isolates of the dimorphic fungus Sporothrix schenckii was comparatively evaluated. The results confirmed that the yeast killer phenomenon is present among hyphomycetes and yeasts and that both morphological forms of S. schenckii are susceptible to the action
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7. High incidence of sensitivity to yeast killer toxins among Candida and Torulopsis isolates of human origin.
Among yeast strains of human origin belonging to the genera Candida, Cryptococcus, Torulopsis, and Rhodotorula which were examined for killer and sensitive characteristics with killer and sensitive strains of Cryptococcus, Hansenula, Kluyveromyces, Pichia, Saccharomyces, and Torulopsis as screening organisms, a high incidence of sensitivity to killer toxins
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8. Discrimination between Candida albicans and Other Pathogenic Species of the Genus Candida by Their Differential Sensitivities to Toxins of a Panel of Killer Yeasts
The differential sensitivities to toxins produced by a short panel of four killer yeasts allowed discrimination between 91 strains of the yeast Candida albicans and 223 non-C. albicans Candida strains. One hundred percent of C. albicans isolates exhibited negative results to the toxin panel, while 100% of non-C. albicans cultures gave well-defined and reprod
American Society for Microbiology.
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9. Killing of Torulopsis glabrata by Saccharomyces cerevisiae Killer Factor
The Saccharomyces cerevisiae killer factor glycoproteins killed the pathogen Torulopsis glabrata by a mechanism involving membrane damage. Some other yeast species were unaffected by these glycoprotein toxins.
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10. Mode of action of yeast toxins: energy requirement for Saccharomyces cerevisiae killer toxin.
The role of the energy status of the yeast cell in the sensitivity of cultures to two yeast toxins was examined by using 12K release from cells as a measure of toxin action. The Saccharomyces cerevisiae killer toxin bound to sensitive cells in the presence of drugs that interfered with the generation or use of energy, but it was unable to efflux 12K from the
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11. Action of Yeast Killer Factor: a Resistant Mutant with Sensitive Spheroplasts
Yeast killer factor proteins bind to cells of both sensitive and killer-producing strains, although the latter are immune to killer action. Spheroplasts prepared from sensitive cells bind less than 1% of the killer bound to whole cells, but remain fully sensitive to killer. This finding and those obtained from binding studies of partially purified, radioacti
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12. Mutational analysis of the functional domains of yeast K1 killer toxin.
To determine the functional domains of K1 killer toxin, we analyzed the phenotypes of a set of mutations throughout regions encoding the alpha- and beta-toxin subunits that allow secretion of mutant toxins. A range of techniques have been used to examine the ability of mutant toxins to bind to beta-glucan cell wall receptor and to form lethal ion channels. O