title: SAC3 may link nuclear protein export to cell cycle progression.
abstract: Selective movement of proteins between the nucleus and the cytoplasm is a regulatory mechanism exploited extensively by the eukaryotic cell. We have identified the evolutionarily conserved Sac3 protein, which was implicated previously in the regulation of mitosis [Bauer, A. & Kölling, R. (1996) J. Cell Sci. 109, 1575-1583] as a novel mediator of nuclear protein export. We show that Sac3p is localized to the nuclear pore, where it interacts with nucleoporins. Loss of SAC3 function results in a block in nuclear export of a nuclear export signal-containing reporter protein. Our results also demonstrate that SAC3 interacts genetically with the nuclear protein export factors Crm1p/Xpo1p and Yrb2p. Taken together, these data indicate a link between nuclear protein export and transition through the cell cycle.
authors.affiliation: Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA.
authors.forename: A L
authors.initials: AL
authors.lastname: Jones
authors.forename: B B
authors.initials: BB
authors.lastname: Quimby
authors.forename: J K
authors.initials: JK
authors.lastname: Hood
authors.forename: P
authors.initials: P
authors.lastname: Ferrigno
authors.forename: P H
authors.initials: PH
authors.lastname: Keshava
authors.forename: P A
authors.initials: PA
authors.lastname: Silver
authors.forename: A H
authors.initials: AH
authors.lastname: Corbett
mesh_terms: D000595:Amino Acid Sequence; D001692:Biological Transport; D002135:Calcium-Binding Proteins; D002453:Cell Cycle; D019084:Fluorescent Antibody Technique, Indirect; D005656:Fungal Proteins / Q000378:metabolism; D017353:Gene Deletion; D049452:Green Fluorescent Proteins; D008164:Luminescent Proteins / Q000235:genetics; D008969:Molecular Sequence Data; D028861:Nuclear Pore Complex Proteins; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D029543:Nucleocytoplasmic Transport Proteins; D018272:Porins; D011485:Protein Binding; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins; D017386:Sequence Homology, Amino Acid
chemical_list: D002135:Calcium-Binding Proteins; D005656:Fungal Proteins; D008164:Luminescent Proteins; C062748:NSP1 protein, S cerevisiae; D028861:Nuclear Pore Complex Proteins; D009687:Nuclear Proteins; D029543:Nucleocytoplasmic Transport Proteins; D018272:Porins; D011993:Recombinant Fusion Proteins; C103382:SAC3 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D049452:Green Fluorescent Proteins