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Reduction of aluminum toxicity by 2-isopropylmalic acid in the budding yeast Saccharomyces cerevisiae.

Identifieur interne : 002215 ( Main/Exploration ); précédent : 002214; suivant : 002216

Reduction of aluminum toxicity by 2-isopropylmalic acid in the budding yeast Saccharomyces cerevisiae.

Auteurs : Taisuke Suzuki [Japon] ; Shun Tamura ; Hiromi Nakanishi ; Mitsuru Tashiro ; Naoko K. Nishizawa ; Etsuro Yoshimura

Source :

RBID : pubmed:17916978

Descripteurs français

English descriptors

Abstract

The budding yeast Saccharomyces cerevisiae secretes 2-isopropylmalic acid (2-iPMA), an intermediate in leucine biosynthesis. Because 2-iPMA binds Al(III) in the culture medium, it is thought to reduce toxicity by Al(III). The effects of 2-iPMA and malic acid (MA) on Al toxicity were investigated in a medium with a low pH and low concentrations of phosphates and magnesium. The reduction in the growth of S. cerevisiae observed in the presence of 100 muM Al(III) ions was relieved more by the addition of 1.0 mM 2-iPMA than by 1.0 mM MA, indicating that 2-iPMA possesses superior Al(III)-ion detoxification ability. Investigations using the wild type and the deltaleu4 and deltaleu9 mutant strains indicated that secretion of a sufficient level of 2-iPMA was required to enhance the Al tolerance. It is thought that 2-iPMA secreted from the yeast cells chelates Al ions and prevents them from entering the cells, resulting in Al tolerance.

DOI: 10.1007/s12011-007-8011-9
PubMed: 17916978


Affiliations:


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Le document en format XML

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<name sortKey="Yoshimura, Etsuro" sort="Yoshimura, Etsuro" uniqKey="Yoshimura E" first="Etsuro" last="Yoshimura">Etsuro Yoshimura</name>
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<term>Chlorides (toxicity)</term>
<term>Malates (pharmacology)</term>
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<term>2-Isopropylmalate synthase (génétique)</term>
<term>Chlorure d'aluminium (MeSH)</term>
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<term>Composés de l'aluminium (toxicité)</term>
<term>Malates (pharmacologie)</term>
<term>Protéines de Saccharomyces cerevisiae (génétique)</term>
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<div type="abstract" xml:lang="en">The budding yeast Saccharomyces cerevisiae secretes 2-isopropylmalic acid (2-iPMA), an intermediate in leucine biosynthesis. Because 2-iPMA binds Al(III) in the culture medium, it is thought to reduce toxicity by Al(III). The effects of 2-iPMA and malic acid (MA) on Al toxicity were investigated in a medium with a low pH and low concentrations of phosphates and magnesium. The reduction in the growth of S. cerevisiae observed in the presence of 100 muM Al(III) ions was relieved more by the addition of 1.0 mM 2-iPMA than by 1.0 mM MA, indicating that 2-iPMA possesses superior Al(III)-ion detoxification ability. Investigations using the wild type and the deltaleu4 and deltaleu9 mutant strains indicated that secretion of a sufficient level of 2-iPMA was required to enhance the Al tolerance. It is thought that 2-iPMA secreted from the yeast cells chelates Al ions and prevents them from entering the cells, resulting in Al tolerance.</div>
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