Glutathione transport systems of the budding yeast Saccharomyces cerevisiae

The budding yeast Saccharomyces cerevisiae was shown to have two kinetically distinguishable glutathione transport Systems. While one with high affinity (GSH-P1; KT=0.045mM) was regulated, the other with low affinity (GSH-P2; KT2 mM) was not. GSH-P1 was highly specific to ghtathione, and its activit...

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Veröffentlicht in:Bioscience, biotechnology, and biochemistry biotechnology, and biochemistry, 1998-10, Vol.62 (10), p.1858-1864
Hauptverfasser: Miyake, T. (Okayama-ken. Government Office (Japan)), Hazu, T, Yoshida, S, Kanayama, M, Tomochika, K, Shinoda, S, Ono, B
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Sprache:eng
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Zusammenfassung:The budding yeast Saccharomyces cerevisiae was shown to have two kinetically distinguishable glutathione transport Systems. While one with high affinity (GSH-P1; KT=0.045mM) was regulated, the other with low affinity (GSH-P2; KT2 mM) was not. GSH-P1 was highly specific to ghtathione, and its activity was quickly lost by suspending the cells in buffer solutions. This activity loss was not observed if glucose-containing buffer was used. In addition, p- isolates had only about one half of the glutathione transport activity of the original (p+) strain. Therefore, it is concluded that GSH-P1 is an ATP-driven transport system. Strong and moderate inhibition of GSH-P1 by protonophores and ionophores, respectively, are attributed to competition for ATP between GSH-P1 and proton- and cation-pumps, respectively
ISSN:0916-8451
1347-6947
DOI:10.1271/bbb.62.1858