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Molecular and Cellular Biology, April 2005, p. 3007-3018, Vol. 25, No. 8
0270-7306/05/$08.00+0     doi:10.1128/MCB.25.8.3007-3018.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Identification of a Novel, Intraperoxisomal Pex14-Binding Site in Pex13: Association of Pex13 with the Docking Complex Is Essential for Peroxisomal Matrix Protein Import

Annette Schell-Steven,1 Katharina Stein,1,{dagger} Mara Amoros,1 Christiane Landgraf,2 Rudolf Volkmer-Engert,2 Hanspeter Rottensteiner,1* and Ralf Erdmann1

Institut für Physiologische Chemie, Abteilung für Systembiochemie, Ruhr-Universität Bochum, Bochum,1 Institut für Medizinische Immunologie, Universitätsklinikum Charité, Berlin, Germany2

Received 28 September 2004/ Returned for modification 20 December 2004/ Accepted 18 January 2005

The peroxisomal docking complex is a key component of the import machinery for matrix proteins. The core protein of this complex, Pex14, is thought to represent the initial docking site for the import receptors Pex5 and Pex7. Associated with this complex is a fraction of Pex13, another essential component of the import machinery. Here we demonstrate that Pex13 directly binds Pex14 not only via its SH3 domain but also via a novel intraperoxisomal site. Furthermore, we demonstrate that Pex5 also contributes to the association of Pex13 with Pex14. Peroxisome function was affected only mildly by mutations within the novel Pex14 interaction site of Pex13 or by the non-Pex13-interacting mutant Pex5W204A. However, when these constructs were tested in combination, PTS1-dependent import and growth on oleic acid were severely compromised. When the SH3 domain-mediated interaction of Pex13 with Pex14 was blocked on top of that, PTS2-dependent matrix protein import was completely compromised and Pex13 was no longer copurified with the docking complex. We conclude that the association of Pex13 with Pex14 is an essential step in peroxisomal protein import that is enabled by two direct interactions and by one that is mediated by Pex5, a result which indicates a novel, receptor-independent function of Pex5.

* Corresponding author. Mailing address: Institut für Physiologische Chemie, Ruhr-Universität Bochum, D-44780 Bochum, Germany. Phone: 49-234-322-7046. Fax: 49-234-321-4266. E-mail: Hanspeter.Rottensteiner{at}ruhr-uni-bochum.de.

{dagger} Present address: Amersham Biosciences, Freiburg, Germany.

Molecular and Cellular Biology, April 2005, p. 3007-3018, Vol. 25, No. 8
0022-538X/05/$08.00+0     doi:10.1128/MCB.25.8.3007-3018.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Kerssen, D., Hambruch, E., Klaas, W., Platta, H. W., de Kruijff, B., Erdmann, R., Kunau, W.-H., Schliebs, W. (2006). Membrane Association of the Cycling Peroxisome Import Receptor Pex5p. J. Biol. Chem. 281: 27003-27015 [Abstract] [Full Text]  


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