title: Subcellular localization of the interaction of bipolar landmarks Bud8p and Bud9p with Rax2p in Saccharomyces cerevisiae diploid cells.
abstract: In Saccharomyces cerevisiae, the bud site selection of diploid cells is regulated by at least four persistent landmarks, Bud8p, Bud9p, Rax1p, and Rax2p. Bud8p and Bud9p are essential for the establishment of bipolar budding and localize mainly to the distal and the proximal poles, respectively. Their subcellular localizations are regulated through interaction with Rax1p/Rax2p. We investigated when and where Bud8p and Bud9p physically interact with Rax2p in vivo using a split-GFP method. GFP fluorescence showed that Bud8p physically interacted with Rax2p at the proximal or distal pole in unbudded cells; a physical interaction was also observed at the opposite pole to the growing bud in mother cells with a large-size bud. Bud9p physically interacted with Rax2p at the birth scar in budded mother cells. These observations suggest that the interaction of Rax2p with Bud8p and Bud9p may contribute to the translocation of bipolar landmarks to the correct sites.
authors.affiliation: Department of Supramolecular Biology, Graduate School of Nanobioscience, Yokohama City University, Suehiro-cho 1-7-29, Tsurumi-ku, Yokohama 230-0045, Japan.
authors.forename: Yu
authors.initials: Y
authors.lastname: Kato
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kawasaki
authors.forename: Noriaki
authors.initials: N
authors.lastname: Arakawa
authors.forename: Hisashi
authors.initials: H
authors.lastname: Hirano
mesh_terms: D002455:Cell Division; D016764:Cell Polarity; D004171:Diploidy; D006023:Glycoproteins / Q000235:genetics / Q000378:metabolism*; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D008562:Membrane Glycoproteins / Q000235:genetics / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*
chemical_list: C419588:BUD8 protein, S cerevisiae; C419589:BUD9 protein, S cerevisiae; D006023:Glycoproteins; D008562:Membrane Glycoproteins; C498873:Rax2 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D049452:Green Fluorescent Proteins