Abstract
The dimorphic yeast Yarrowia lipolytica forms true hyphae in a medium containing N-acetylglucosamine. We made a new finding that serum is a very effective inducer of hypha formation of Y. lipolytica: serum induced its hyphal growth very quickly compared to N-acetylglucosamine (4 h vs. 10 h). Osmotic and oxidative stresses (0.2 M NaCl and 20 mM H 2O 2) inhibited the hypha formation induced by N-acetylglucosamine, but did not suppress the hypha formation triggered by serum. Serum-specific morphological mutants, which formed hyphae in the N-acetylglucosamine medium but not in serum medium, could be isolated. These results suggest that the signal triggered by serum may be transduced through a different pathway, at least in part, from that used for the N-acetylglucosamine signal in Y. lipolytica.
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