METABOLIC ENGINEERING OF A GALACTOSE ASSIMILATION PATHWAY IN THE GLYCOENGINEERED YEAST PICHIA PASTORIS

摘要

Lower eukaryotic cells such as Pichia pastoris that normally cannot use galactose as a carbon source but which have been genetically engineered according to the methods herein to use galactose as a sole source of carbon are described. The cells are genetically engineered to express several of the enzymes comprising the Leloir pathway. In particular, the cells are genetically engineered to express a galactokinase, a UDP-galactose-C4-epimerase, and a galactose-1-phosphate uridyltransferase, and optionally a galactose permease. Glycoproteins are provided wherein the ratio of G0:G1/G2 glycoforms therein is less than 2:1.