title: Isolation and characterization of SpTRK, a gene from Schizosaccharomyces pombe predicted to encode a K+ transporter protein.
abstract: A novel gene, SpTRK, has been isolated from DNA of the fission yeast Schizosaccharomyces pombe (Sp) by hybridization to an oligodeoxyribonucleotide (oligo) probe designed from a sequence fully conserved between the potassium transporter genes TRK1 and TRK2 of Saccharomyces cerevisiae (Sc). SpTRK is a single-copy gene located on Sp chromosome I. Nucleotide sequence analysis of the cloned gene identified an open reading frame (ORF) with coding capacity for a protein of 833 amino acids (aa). The predicted SpTRK aa sequence showed a high level of conservation relative to the potassium transporters of Sc and Saccharomyces uvarum (Su), particularly within their transmembrane (TM) domains and in aa required for their ion transport functions. A single SpTRK transcript of about 2.7 kb is expressed at high levels in exponentially growing Sp cells, but it is downregulated in cells from stationary cultures.
authors.affiliation: Department of Radiation Medicine, Georgetown University Medical Center, Washington, DC 20007, USA.
authors.forename: V A
authors.initials: VA
authors.lastname: Soldatenkov
authors.forename: J A
authors.initials: JA
authors.lastname: Velasco
authors.forename: M A
authors.initials: MA
authors.lastname: Avila
authors.forename: A
authors.initials: A
authors.lastname: Dritschilo
authors.forename: V
authors.initials: V
authors.lastname: Notario
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002352:Carrier Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D027682:Cation Transport Proteins; D002874:Chromosome Mapping; D015825:Chromosomes, Fungal; D003001:Cloning, Molecular; D004274:DNA, Recombinant; D005656:Fungal Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D005800:Genes, Fungal; D008565:Membrane Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D011188:Potassium / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins; D012568:Schizosaccharomyces / Q000235:genetics*; D017386:Sequence Homology, Amino Acid
chemical_list: D002352:Carrier Proteins; D027682:Cation Transport Proteins; D004274:DNA, Recombinant; D005656:Fungal Proteins; D008565:Membrane Proteins; D029701:Saccharomyces cerevisiae Proteins; C085258:TRK2 protein, S cerevisiae; C068664:TRK1 protein, S cerevisiae; D011188:Potassium