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Glycosylphosphatidylinositol (GPI)-anchored glycoproteins have various intrinsic functions in yeasts and different usesin vitro . In the present study, the genome ofPichia pastoris GS115 was screened for potential GPI-modified cell wall proteins. Fifty putative GPI-anchored proteins were selected on the basis of (i) the presence of a C-terminal GPI attachment signal sequence, (ii) the presence of an N-terminal signal sequence for secretion, and (iii) the absence of transmembrane domains in mature protein. The predicted GPI-anchored proteins were fused to an alpha-factor secretion signal as a substitute for their own N-terminal signal peptides and tagged with the chimeric reporters FLAG tag and matureCandida antarctica lipase B (CALB). The expression of fusion proteins on the cell surface ofP. pastoris GS115 was determined by whole-cell flow cytometry and immunoblotting analysis of the cell wall extracts obtained by β-1,3-glucanase digestion. CALB displayed on the cell surface ofP. pastoris GS115 with the predicted GPI-anchored proteins was examined on the basis of potential hydrolysis ofp -nitrophenyl butyrate. Finally, 13 proteins were confirmed to be GPI-modified cell wall proteins inP. pastoris GS115, which can be used to display heterologous proteins on the yeast cell surface.

Screening for Glycosylphosphatidylinositol-Modified Cell Wall Proteins in Pichia pastoris and Their Recombinant Expression on the Cell Surface