HPLC analysis of the N-linked oligosaccharides of EGI and cell wall mannoproteins from wild-type (WT) and Ylmpo1Δ mutant strains. (A) N-linked oligosaccharides from the recombinant EGI secreted from wild-type (a), Yloch1Δ (b), Ylmpo1Δ (c), and Yloch1Δ Ylmpo1Δ (d) strains were labeled with PA and analyzed by NP-HPLC. (B) N-linked oligosaccharides from the CWPs of wild-type (a), Yloch1Δ (b), Ylmpo1Δ (c), and Yloch1Δ Ylmpo1Δ (d) strains were labeled with 2-AA and analyzed by NP-HPLC. The elution times of the peaks were compared with those of authentic PA- or AA-sugar chains (Man7GlcNAc2-AA and Man8GlcNAc2-AA) of known structure (indicated by arrows): M7, Man7GlcNAc2-PA; M8, Man8GlcNAc2-PA; M9, Man9GlcNAc2-PA; M10, Man10GlcNAc2-PA; 1*, monomannosylphosphorylated Man8GlcNAc2-PA; 2*, monomannosylphosphorylated Man9GlcNAc2-PA.