title: The common phospholipid-binding activity of the N-terminal domains of PEX1 and VCP/p97.
abstract: PEX1 is a type II AAA-ATPase that is indispensable for biogenesis and maintenance of the peroxisome, an organelle responsible for the primary metabolism of lipids, such as beta-oxidation and lipid biosynthesis. Recently, we demonstrated a striking structural similarity between its N-terminal domain and those of other membrane-related AAA-ATPases, such as valosine-containing protein (p97). The N-terminal domain of valosine-containing protein serves as an interface to its adaptor proteins p47 and Ufd1, whereas the physiologic interaction partner of the N-terminal domain of PEX1 remains unknown. Here we found that N-terminal domains isolated from valosine-containing protein, as well as from PEX1, bind phosphoinositides. The N-terminal domain of PEX1 appears to preferentially bind phosphatidylinositol 3-monophosphate and phosphatidylinositol 4-monophosphate, whereas the N-terminal domain of valosine-containing protein displays broad and nonspecific lipid binding. Although N-ethylmaleimide-sensitive fusion protein, CDC48 and Ufd1 have structures similar to that of valosine-containing protein, they displayed lipid specificity similar to that of the N-terminal domain of PEX1 in the assays. By mutational analysis, we demonstrate that a conserved arginine surrounded by hydrophobic residues is essential for lipid binding, despite very low sequence similarity between PEX1 and valosine-containing protein.
authors.affiliation: International Graduate School of Arts and Sciences, Yokohama City University, 1-7-29 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan.
authors.forename: Kumiko
authors.initials: K
authors.lastname: Shiozawa
authors.forename: Natsuko
authors.initials: N
authors.lastname: Goda
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Shimizu
authors.forename: Kenji
authors.initials: K
authors.lastname: Mizuguchi
authors.forename: Naomi
authors.initials: N
authors.lastname: Kondo
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Shimozawa
authors.forename: Masahiro
authors.initials: M
authors.lastname: Shirakawa
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Hiroaki
mesh_terms: D000074183:ATPases Associated with Diverse Cellular Activities; D000251:Adenosine Triphosphatases / Q000737:chemistry* / Q000235:genetics; D000595:Amino Acid Sequence; D000818:Animals; D018797:Cell Cycle Proteins / Q000737:chemistry* / Q000235:genetics; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D008081:Liposomes / Q000737:chemistry; D008565:Membrane Proteins / Q000737:chemistry* / Q000235:genetics; D051379:Mice; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009154:Mutation; D052066:N-Ethylmaleimide-Sensitive Proteins / Q000737:chemistry / Q000235:genetics; D018129:Phosphatidylinositol Phosphates / Q000737:chemistry; D017434:Protein Structure, Tertiary; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000235:genetics; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry* / Q000235:genetics; D017386:Sequence Homology, Amino Acid; D000074405:Valosin Containing Protein; D033921:Vesicular Transport Proteins
chemical_list: D018797:Cell Cycle Proteins; D008081:Liposomes; D008565:Membrane Proteins; D018129:Phosphatidylinositol Phosphates; D011993:Recombinant Fusion Proteins; D029701:Saccharomyces cerevisiae Proteins; C444652:UFD1 protein, S cerevisiae; D033921:Vesicular Transport Proteins; C055525:phosphatidylinositol 3-phosphate; C037178:phosphatidylinositol 4-phosphate; D000251:Adenosine Triphosphatases; D000074183:ATPases Associated with Diverse Cellular Activities; C000614177:CDC48 protein, S cerevisiae; C511586:PEX1 protein, S cerevisiae; C111808:PEX1 protein, human; C495989:Pex1 protein, mouse; D052066:N-Ethylmaleimide-Sensitive Proteins; C000614178:VCP protein, human; D000074405:Valosin Containing Protein; C000614179:Vcp protein, mouse