title: Cell surface-engineered yeast displaying a histidine oligopeptide (hexa-His) has enhanced adsorption of and tolerance to heavy metal ions.
abstract: A histidine oligopeptide (hexa-His) with the ability to chelate divalent heavy metal ions was displayed on the yeast cell surface for the purpose of enhanced adsorption of heavy metal ions. We genetically fused a hexa-His-encoding gene with the gene encoding the C-terminal half of alpha-agglutinin that includes a glycosylphosphatidylinositol anchor attachment signal sequence and attached the hexa-His peptide on the cell wall of Saccharomyces cerevisiae. This surface-engineered yeast adsorbed three to eight times more copper ions than the parent strain and was more resistant to copper (4 mM) than the parent (below 1 mM at pH 7.8). It was possible to recover about a half of the copper ions adsorbed by whole cells with EDTA treatment without disintegrating the cells. Thus, we succeeded in constructing a novel yeast cell with both tolerance to toxic contaminants and enhanced adsorption of metal ions onto the cell surface.
authors.affiliation: Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kuroda
authors.forename: S
authors.initials: S
authors.lastname: Shibasaki
authors.forename: M
authors.initials: M
authors.lastname: Ueda
authors.forename: A
authors.initials: A
authors.lastname: Tanaka
mesh_terms: D000327:Adsorption; D019677:Artificial Gene Fusion; D002462:Cell Membrane / Q000378:metabolism; D002614:Chelating Agents / Q000378:metabolism; D003300:Copper / Q000378:metabolism / Q000633:toxicity; D005818:Genetic Engineering; D005822:Genetic Vectors; D000072235:Mating Factor; D019216:Metals, Heavy / Q000378:metabolism* / Q000633:toxicity; D009842:Oligopeptides / Q000235:genetics / Q000378:metabolism*; D010455:Peptides / Q000235:genetics / Q000378:metabolism; D010957:Plasmids / Q000235:genetics; D021382:Protein Sorting Signals / Q000235:genetics; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000187:drug effects / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism*; D014170:Transformation, Genetic
chemical_list: D002614:Chelating Agents; D019216:Metals, Heavy; D009842:Oligopeptides; D010455:Peptides; D021382:Protein Sorting Signals; D011993:Recombinant Fusion Proteins; D000072235:Mating Factor; D003300:Copper