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Provedor de dados:  IPB - Escola Superior Agrária
País:  Portugal
Título:  Transport of acetic acid in Zygosaccharomyces bailii: effects of ethanol and implications on the resistance of the yeast to acid environments
Autores:  Sousa, Maria João
Estevinho, Leticia M.
Côrte-Real, Manuela
Leão, Cecília
Data:  2011-05-19
Ano:  1996
Palavras-chave:  Zygosaccharomyces bailii
Resumo:  Cells of Zygosaccharomyces bailii ISA 1307 grown in a medium with acetic acid, ethanol, or glycerol as the sole carbon and energy source transported acetic acid by a saturable transport system. This system accepted propionic and formic acids but not lactic, sorbic, and benzoic acids. When the carbon source was glucose or fructose, the cells displayed activity of a mediated transport system specific for acetic acid, apparently not being able to recognize other monocarboxylic acids. In both types of cells, ethanol inhibited the transport of labelled acetic acid. The inhibition was noncompetitive, and the dependence of the maximum transport rate on the ethanol concentration was found to be exponential. These results reinforced the belief that, under the referenced growth conditions, the acid entered the cells mainly through a transporter protein. The simple diffusion of the undissociated acid appeared to contribute, with a relatively low weight, to the overall acid uptake. It was concluded that in Z. bailii, ethanol plays a protective role against the possible negative effects of acetic acid by inhibiting its transport and accumulation. Thus, the intracellular concentration of the acid could be maintained at levels lower than those expected if the acid entered the cells only by simple diffusion.
Tipo:  Article
Idioma:  Inglês
Identificador:  Maria João, Sousa; Estevinho, Letícia M.; Côrte-Real, Manuela; Leão, Cecília (1996) - Transport of acetic acid in Zygosaccharomyces bailii: effects of ethanol and implications on the resistance of the yeast to acid environments. Applied and Environmental Microbiology. ISSN 0099-2240. 62:9, p. 3152-3157

0099-2240

http://hdl.handle.net/10198/4395
Editor:  American Society of Microbiology
Direitos:  open access
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