Journal
CURRENT GENETICS
Volume 55, Issue 3, Pages 301-309Publisher
SPRINGER
DOI: 10.1007/s00294-009-0246-x
Keywords
pigP; GPI-GlcNAc transferase; GPI anchor; Alkaline protease; Aspergillus nidulans
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Funding
- State Committee for Scientific Research [2P04A04628]
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Glycosylphosphatidylinositol (GPI) anchoring is the main mechanism allowing proper localization of secretory proteins in cell membranes. We have isolated an Aspergillus nidulans homolog of the human PIG-P gene, which encodes a subunit of acetylglucosaminyltransferase (GPI-GnT)-an enzyme involved in the synthesis of GPI anchors. A. nidulans pigP mutants have significantly decreased GPI synthesis. On solid media they show strong growth retardation (the button phenotype) while in liquid minimal media they show overall good growth but with hyperbranched and bulbous hyphae with impaired septation. Furthermore, the pigP strains, in contrast to the wild-type, abundantly secrete a 33-kDa alkaline serine protease (ALP) into the liquid medium.
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