Extracellular Phosphomannan as Phospate Reserve in Yeast Kuraishia capsulata
T was found that extracellular phosphomannan is the main phosphate reserve in the yeast Kuraishia capsulata, unlike other yeast species effectively absorbing P i. Under nitrogen starvation, K. capsulata absorbs essentially all the P i from medium containing 240 mM glucose, 2,5 mM Mg 2+, and 11 mM KH 2PO 4. Inorganic polyphosphate level in the cells was about 14% of the P i absorbed. The main part of P i (~ 60%) was found in the fraction of extracellular phospho-mannan that can be used as a carbon and phosphorus source by this yeast in deficient media.