Abstract
A kinetic study of Pi transport with 32Pi revealed that Saccharomyces cerevisiae has two systems of Pi transport, one with a low Km value (8.2 microM) for external Pi and the other with a high Km value (770 microM). The low-Km system was derepressed by Pi starvation, and the activity was expressed under the control of a genetic system which regulates the repressible acid and alkaline phosphatases. The function of the PHO2 gene, which is essential for the derepression of repressible acid phosphatase but not for the derepression of repressible alkaline phosphatase, was also indispensable for the derepression of the low-Km system.
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