PT - JOURNAL ARTICLE AU - Kappei Tsukahara AU - Tatsuo Watanabe AU - Naoko Hata-Sugi AU - Kentaro Yoshimatsu AU - Hiroto Okayama AU - Takeshi Nagasu TI - Anticancer Agent E7070 Inhibits Amino Acid and Uracil Transport in Fission Yeast AID - 10.1124/mol.60.6.1254 DP - 2001 Dec 01 TA - Molecular Pharmacology PG - 1254--1259 VI - 60 IP - 6 4099 - http://molpharm.aspetjournals.org/content/60/6/1254.short 4100 - http://molpharm.aspetjournals.org/content/60/6/1254.full SO - Mol Pharmacol2001 Dec 01; 60 AB - E7070 is a novel sulfonamide anticancer agent that inhibits cell cycle progression in G1 in mammalian cells, but its action targets are not known. We recently employed the genetically amenable fission yeast Schizosaccharomyces pombe as a model organism to search for its targets. Here, we show that E7070 inhibits imports of amino acid and uracil into S. pombe cells. Unlike their prototrophic counterparts, leucine- and uracil-auxotrophic strains are sensitive to E7070 and are unable to proliferate with a delayed G1-S transition in low-glucose yeast extract-polypeptone medium containing this drug because this chemical markedly inhibits the uptake of leucine and uracil in low glucose medium. Furthermore, addition of leucine or uracil to the culture medium or overexpression of genes encoding an amino acid or uracil transporter suppresses the E7070-imposed growth inhibition of these auxotrophic strains. Thus, some of the molecular targets for E7070 action in S. pombe are likely to be leucine and uracil transporters.