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Candida albicans N-acetylglucosaminylphosphatidylinositol de-N-acetylase (CaGpi12) recognises N-acetylglucosaminylphosphatidylinositol (GlcNAc-PI) from Saccharomyces cerevisiae and is able to complement ScGPI12 function. Both N- and C-terminal ends of CaGpi12 are important for its function. CaGpi12 was biochemically characterised using rough endoplasmic reticulum microsomes prepared from BWP17 strain of C. albicans. CaGpi12 is optimally active at 30°C and pH 7.5. It is a metal-dependent enzyme that is stimulated by divalent cations but shows no preference for Zn2+ unlike the mammalian homologue. It irreversibly loses activity upon incubation with a metal chelator. Two conserved motifs, HPDDE and HXXH, are both important for its function in the cell. CaGPI12 is essential for growth and viability of C. albicans. Its loss causes reduction of GlcNAc-PI de-N-acetylase activity, cell wall defects and filamentation defects. The filamentation defects could be specifically correlated to an upregulation of the HOG1 pathway.

fems yeast research

Characterising N-acetylglucosaminylphosphatidylinositol de-N-acetylase (CaGpi12), the enzyme that catalyses the second step of GPI biosynthesis in Candida albicans