title: Validation of the Hsp150 polypeptide carrier and HSP150 promoter in expression of rat alpha2,3-sialyltransferase in yeasts.
abstract: Heterologous glycoproteins usually do not fold properly in yeast cells and fail to leave the endoplasmic reticulum. Here we show that the Hsp150Delta polypeptide carrier promoted proper folding and secretion of the catalytic ectodomain of rat alpha2,3-sialyltransferase (ST3Ne) in Pichia pastoris. The efficiency of the Hsp150Delta carrier in P. pastoris and Saccharomyces cerevisiae was at least as high as that of the MFalpha carrier. Most of Hsp150Delta-ST3Ne and MFalpha-ST3Ne remained noncovalently attached to the cell wall via the ST3Ne portion. The strength of the HSP150 promoter was found to be comparable to that of the GAL1 promoter.
authors.affiliation: Program in Cellular Biotechnology, Institute of Biotechnology, and Department of Applied Chemistry and Microbiology, University of Helsinki, Viikinkaari 9, 00710 Helsinki, Finland.
authors.forename: Eeva
authors.initials: E
authors.lastname: Sievi
authors.forename: Anna-Liisa
authors.initials: AL
authors.lastname: Hänninen
authors.forename: Hanna
authors.initials: H
authors.lastname: Salo
authors.forename: Vijay
authors.initials: V
authors.lastname: Kumar
authors.forename: Marja
authors.initials: M
authors.lastname: Makarow
mesh_terms: D000818:Animals; D015971:Gene Expression Regulation, Enzymologic / Q000502:physiology; D015966:Gene Expression Regulation, Fungal / Q000502:physiology; D006023:Glycoproteins; D006360:Heat-Shock Proteins / Q000235:genetics* / Q000378:metabolism*; D010843:Pichia / Q000201:enzymology* / Q000235:genetics; D011401:Promoter Regions, Genetic; D051381:Rats; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis / Q000235:genetics; D012441:Saccharomyces cerevisiae / Q000201:enzymology* / Q000235:genetics; D029701:Saccharomyces cerevisiae Proteins; D012799:Sialyltransferases / Q000235:genetics* / Q000378:metabolism*; D000094663:beta-Galactoside alpha-2,3-Sialyltransferase
chemical_list: D006023:Glycoproteins; C074229:HSP150 protein, S cerevisiae; D006360:Heat-Shock Proteins; D011993:Recombinant Fusion Proteins; D029701:Saccharomyces cerevisiae Proteins; D012799:Sialyltransferases; D000094663:beta-Galactoside alpha-2,3-Sialyltransferase