title: A yeast metal resistance protein similar to human cystic fibrosis transmembrane conductance regulator (CFTR) and multidrug resistance-associated protein.
abstract: Members of the ATP binding cassette (ABC) protein superfamily transport a variety of substances across biological membranes, including drugs, ions, and peptides. The yeast cadmium factor (YCF1) gene from Saccharomyces cerevisiae is required for cadmium resistance and encodes a 1,515 amino acid protein with extensive homology to both the human multidrug resistance-associated protein (MRP1) and the cystic fibrosis transmembrane conductance regulator (hCFTR). S. cerevisiae cells harboring a deletion of the YCF1 gene are hypersensitive to cadmium compared with wild type cells. Mutagenesis experiments demonstrate that conserved amino acid residues, functionally critical in hCFTR, play a vital role in YCF1-mediated cadmium resistance. Mutagenesis of phenylalanine 713 in the YCF1 nucleotide binding fold 1, which correlates with the delta F508 mutation found in the most common form of cystic fibrosis, completely abolished YCF1 function in cadmium detoxification. Furthermore, substitution of a serine to alanine residue in a potential protein kinase A phosphorylation site in a central region of YCF1, which displays sequence similarity to the central regulatory domain of hCFTR, also rendered YCF1 nonfunctional. These results suggest that YCF1 is composed of modular domains found in human proteins which function in drug and ion transport.
authors.affiliation: Department of Biological Chemistry, University of Michigan Medical School, Ann Arbor 48109-0606.
authors.forename: M S
authors.initials: MS
authors.lastname: Szczypka
authors.forename: J A
authors.initials: JA
authors.lastname: Wemmie
authors.forename: W S
authors.initials: WS
authors.lastname: Moye-Rowley
authors.forename: D J
authors.initials: DJ
authors.lastname: Thiele
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D018528:ATP-Binding Cassette Transporters; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002104:Cadmium / Q000633:toxicity*; D002352:Carrier Proteins / Q000235:genetics*; D003550:Cystic Fibrosis / Q000235:genetics; D019005:Cystic Fibrosis Transmembrane Conductance Regulator; D017931:DNA Primers; D004330:Drosophila / Q000235:genetics; D004351:Drug Resistance / Q000235:genetics*; D004352:Drug Resistance, Microbial / Q000235:genetics*; D005656:Fungal Proteins / Q000096:biosynthesis / Q000235:genetics*; D017353:Gene Deletion; D015870:Gene Expression; D005800:Genes, Fungal; D006801:Humans; D008562:Membrane Glycoproteins / Q000235:genetics*; D008565:Membrane Proteins / Q000235:genetics*; D008969:Molecular Sequence Data; D016296:Mutagenesis; D010641:Phenotype; D016133:Polymerase Chain Reaction; D012441:Saccharomyces cerevisiae / Q000187:drug effects / Q000235:genetics* / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins; D017386:Sequence Homology, Amino Acid
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D018528:ATP-Binding Cassette Transporters; C505032:CFTR protein, human; D002352:Carrier Proteins; D017931:DNA Primers; D005656:Fungal Proteins; D008562:Membrane Glycoproteins; D008565:Membrane Proteins; D029701:Saccharomyces cerevisiae Proteins; C089179:YCF1 protein, S cerevisiae; D002104:Cadmium; D019005:Cystic Fibrosis Transmembrane Conductance Regulator