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  • Title: A novel alkali-tolerant Yarrowia lipolytica strain for dissecting Na+-coupled phosphate transport systems in yeasts.
    Author: Zvyagilskaya R, Persson BL.
    Journal: Cell Biol Int; 2005 Jan; 29(1):87-94. PubMed ID: 15763505.
    Abstract:
    The newly isolated osmo-, salt- and alkali-tolerant Yarrowia lipolytica yeast strain is remarkable by its capacity to grow at alkaline pH values (pH 9.7), which makes it an excellent model system for studying Na(+)-coupled phosphate transport systems in yeast cells grown at alkaline conditions. In cells Y. lipolytica grown at pH 9.7, phosphate uptake was mediated by several kinetically discrete Na(+)-dependent systems that are specifically activated by Na(+) ions. One of these, a low-affinity transporter, operated at high-phosphate concentrations. The other two, derepressible, high-affinity, high-capacity systems, functioned during phosphate starvation. Both H(+)- and Na(+)-coupled high-affinity phosphate transport systems of Y. lipolytica cells were under the dual control of the prevailing extracellular phosphate concentrations and pH values. The contribution of the Na(+)/P(i)-cotransport systems into the total cellular phosphate uptake activity was progressively increased with increasing pH, reaching its maximum at pH > or = 9.
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