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Vanadate, a potent inhibitor of plasma membrane ATPases, is taken up by Neurospora crassa only when cells are growing in alkaline medium and starving for phosphate. The appearance of a vanadate uptake system (Km = 8.2 microM; Vmax = 0.15 mmol/min per liter of cell water) occurs under the same conditions required for derepression of a high-affinity phosphate transport system. Phosphate is a competitive inhibitor of vanadate uptake, and vanadate is a competitive inhibitor of phosphate uptake. Furthermore, mutant strains which are either partially constitutive or non-derepressible for the high-affinity phosphate transport system are also partially constitutive or non-derepressible for vanadate uptake. These data indicate that vanadate enters the cell via phosphate transport system II.

Vanadate uptake in Neurospora crassa occurs via phosphate transport system II