title: Pom33, a novel transmembrane nucleoporin required for proper nuclear pore complex distribution.
abstract: The biogenesis of nuclear pore complexes (NPCs) represents a paradigm for the assembly of high-complexity macromolecular structures. So far, only three integral pore membrane proteins are known to function redundantly in NPC anchoring within the nuclear envelope. Here, we describe the identification and functional characterization of Pom33, a novel transmembrane protein dynamically associated with budding yeast NPCs. Pom33 becomes critical for yeast viability in the absence of a functional Nup84 complex or Ndc1 interaction network, which are two core NPC subcomplexes, and associates with the reticulon Rtn1. Moreover, POM33 loss of function impairs NPC distribution, a readout for a subset of genes required for pore biogenesis, including members of the Nup84 complex and RTN1. Consistently, we show that Pom33 is required for normal NPC density in the daughter nucleus and for proper NPC biogenesis and/or stability in the absence of Nup170. We hypothesize that, by modifying or stabilizing the nuclear envelope-NPC interface, Pom33 may contribute to proper distribution and/or efficient assembly of nuclear pores.
authors.affiliation: Institut Jacques Monod, UMR 7592, Centre National de la Recherche Scientifique/Université Paris Diderot, 75013 Paris, France.
authors.forename: Anne
authors.initials: A
authors.lastname: Chadrin
authors.forename: Barbara
authors.initials: B
authors.lastname: Hess
authors.forename: Mabel
authors.initials: M
authors.lastname: San Roman
authors.forename: Xavier
authors.initials: X
authors.lastname: Gatti
authors.forename: Bérangère
authors.initials: B
authors.lastname: Lombard
authors.forename: Damarys
authors.initials: D
authors.lastname: Loew
authors.forename: Yves
authors.initials: Y
authors.lastname: Barral
authors.forename: Benoit
authors.initials: B
authors.lastname: Palancade
authors.forename: Valérie
authors.initials: V
authors.lastname: Doye
mesh_terms: D021581:Active Transport, Cell Nucleus / Q000235:genetics; D000595:Amino Acid Sequence; D049109:Cell Proliferation; D004721:Endoplasmic Reticulum / Q000378:metabolism; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism; D008969:Molecular Sequence Data; D022022:Nuclear Pore / Q000235:genetics / Q000378:metabolism* / Q000648:ultrastructure; D028861:Nuclear Pore Complex Proteins / Q000235:genetics / Q000378:metabolism*; D029543:Nucleocytoplasmic Transport Proteins / Q000235:genetics / Q000378:metabolism; D010802:Phylogeny; D011485:Protein Binding / Q000502:physiology; D012333:RNA, Messenger / Q000378:metabolism; D016601:RNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism; D043244:Ribonuclease III / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*; D017386:Sequence Homology, Amino Acid; D013692:Telophase / Q000502:physiology
chemical_list: C085976:MIG1 protein, S cerevisiae; D008565:Membrane Proteins; C080773:NAB2 protein, S cerevisiae; C091271:NUP133 protein, S cerevisiae; C097179:NUP157 protein, S cerevisiae; C097178:NUP170 protein, S cerevisiae; C097894:NUP84 protein, S cerevisiae; D028861:Nuclear Pore Complex Proteins; D029543:Nucleocytoplasmic Transport Proteins; C550848:Pom33 protein, S cerevisiae; D012333:RNA, Messenger; D016601:RNA-Binding Proteins; D011993:Recombinant Fusion Proteins; D012097:Repressor Proteins; D029701:Saccharomyces cerevisiae Proteins; C468367:RNT1 protein, S cerevisiae; D043244:Ribonuclease III