title: Structural and functional analysis of the interaction of the AAA-peroxins Pex1p and Pex6p.
abstract: The AAA-peroxins Pex1p and Pex6p play a critical role in peroxisome biogenesis but their precise function remains to be established. These two peroxins consist of three distinct regions (N, D1, D2), two of which (D1, D2) contain a conserved approximately 230 amino acid cassette, which is common to all ATPases associated with various cellular activities (AAA). Here we show that Pex1p and Pex6p from Saccharomyces cerevisiae do interact in vivo. We assigned their corresponding binding sites and elucidated the importance of ATP-binding and -hydrolysis of Pex1p and Pex6p for their interaction. We show that the interaction of Pex1p and Pex6p involves their first AAA-cassettes and demonstrate that ATP-binding but not ATP-hydrolysis in the second AAA-cassette (D2) of Pex1p is required for the Pex1p-Pex6p interaction. Furthermore, we could prove that the second AAA-cassettes (D2) of both Pex1p and Pex6p were essential for peroxisomal biogenesis and thus probably comprise the overall activity of the proteins.
authors.affiliation: Abteilung für Zellbiochemie, Medizinische Fakultät der Ruhr-Universität Bochum, Germany.
authors.forename: Ingvild
authors.initials: I
authors.lastname: Birschmann
authors.forename: Katja
authors.initials: K
authors.lastname: Rosenkranz
authors.forename: Ralf
authors.initials: R
authors.lastname: Erdmann
authors.forename: Wolf-H
authors.initials: WH
authors.lastname: Kunau
mesh_terms: D000074183:ATPases Associated with Diverse Cellular Activities; D000251:Adenosine Triphosphatases / Q000737:chemistry / Q000378:metabolism* / Q000502:physiology; D000255:Adenosine Triphosphate / Q000378:metabolism; D001483:Base Sequence; D017931:DNA Primers; D005656:Fungal Proteins / Q000737:chemistry / Q000378:metabolism* / Q000502:physiology; D008565:Membrane Proteins / Q000737:chemistry / Q000378:metabolism* / Q000502:physiology; D011485:Protein Binding; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry / Q000378:metabolism* / Q000502:physiology
chemical_list: D017931:DNA Primers; D005656:Fungal Proteins; D008565:Membrane Proteins; D029701:Saccharomyces cerevisiae Proteins; D000255:Adenosine Triphosphate; D000251:Adenosine Triphosphatases; D000074183:ATPases Associated with Diverse Cellular Activities; C511586:PEX1 protein, S cerevisiae; C490760:PEX6 protein, S cerevisiae