Engineering complex-type N-glycosylation in Pichia pastoris using GlycoSwitch technology.
Here we provide a protocol for engineering the N-glycosylation pathway of the yeast Pichia pastoris. The general strategy consists of the disruption of an endogenous glycosyltransferase gene (OCH1) and the stepwise introduction of heterologous glycosylation enzymes. Each engineering step results in the introduction of one glycosidase or glycosyltransferase activity into the Pichia endoplasmic reticulum or Golgi complex and consists of a number of stages: transformation with the appropriate GlycoSwitch vector, small-scale cultivation of a number of transformants, sugar analysis and heterologous protein expression analysis. If desired, the resulting clone can be further engineered by repeating the procedure with the next GlycoSwitch vector. Each engineering step takes approximately 3 weeks. The conversion of any wild-type Pichia strain into a strain that modifies its glycoproteins with Gal(2)GlcNAc(2)Man(3)GlcNAc(2)N-glycans requires the introduction of five GlycoSwitch vectors. Three examples of the full engineering procedure are provided to illustrate the results that can be expected.
Jacobs
Pieter P
PP
Unit for Molecular Glycobiology, Department for Molecular Biomedical Research, VIB, Technologiepark 927, B-9052 Ghent (Zwijnaarde), Belgium.
Geysens
Steven
S
Vervecken
Wouter
W
Contreras
Roland
R
Callewaert
Nico
N
D004721:Endoplasmic Reticulum / Q000201:enzymology / Q000378:metabolism; D005822:Genetic Vectors / Q000235:genetics; D005964:Glucosyltransferases / Q000235:genetics* / Q000378:metabolism; D006031:Glycosylation; D006056:Golgi Apparatus / Q000201:enzymology / Q000378:metabolism; D010843:Pichia / Q000235:genetics* / Q000378:metabolism; D015202:Protein Engineering / Q000379:methods*
D005964:Glucosyltransferases