Putative GTP-binding protein, Gtr1, associated with the function of the Pho84 inorganic phosphate transporter in Saccharomyces cerevisiae.
We have found an open reading frame which is 1.1 kb upstream of PHO84 (which encodes a Pi transporter) and is transcribed from the opposite strand. In Saccharomyces cerevisiae, this gene is distal to the TUB3 locus on the left arm of chromosome XIII and is named GTR1. GTR1 encodes a protein consisting of 310 amino acid residues containing, in its N-terminal region, the characteristic tripartite consensus elements for binding GTP conserved in GTP-binding proteins, except for histidine in place of a widely conserved aspargine residue in element III. Disruption of the GTR1 gene resulted in slow growth at 30 degrees C and no growth at 15 degrees C; other phenotypes resembled those of pho84 mutants and included constitutive synthesis of repressible acid phosphatase, reduced Pi transport activity, and resistance to arsenate. The latter phenotypes were shown to be due to a defect in Pi uptake, and the Gtr1 protein was found to be functionally associated with the Pho84 Pi transporter. Recombination between chromosome V (at the URA3 locus) and chromosome XIII (in the GTR1-PHO84-TUB3 region) by using a plasmid-encoded site-specific recombination system indicated that the order of these genes was telomere-TUB3-PHO84-GTR1-CENXIII.
Bun-Ya
M
M
Department of Biotechnology, Faculty of Engineering, Osaka University, Japan.
Harashima
S
S
Oshima
Y
Y
D000135:Acid Phosphatase / Q000096:biosynthesis; D000595:Amino Acid Sequence; D001483:Base Sequence; D001693:Biological Transport, Active; D002352:Carrier Proteins / Q000096:biosynthesis*; D002874:Chromosome Mapping; D016384:Consensus Sequence; D019204:GTP-Binding Proteins / Q000096:biosynthesis / Q000235:genetics*; D015971:Gene Expression Regulation, Enzymologic; D008969:Molecular Sequence Data; D020559:Monomeric GTP-Binding Proteins; D016296:Mutagenesis; D028044:Phosphate-Binding Proteins; D010710:Phosphates / Q000378:metabolism; D011995:Recombination, Genetic; D012441:Saccharomyces cerevisiae / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins; D012689:Sequence Homology, Nucleic Acid; D014158:Transcription, Genetic
D002352:Carrier Proteins; C121262:Gtr1 protein, S cerevisiae; D028044:Phosphate-Binding Proteins; D010710:Phosphates; D029701:Saccharomyces cerevisiae Proteins; D000135:Acid Phosphatase; D019204:GTP-Binding Proteins; D020559:Monomeric GTP-Binding Proteins