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Acyl-CoA oxidase is imported as a heteropentameric, cofactor-containing complex into peroxisomes of Yarrowia lipolytica


Acyl-CoA oxidase is imported as a heteropentameric, cofactor-containing complex into peroxisomes of Yarrowia lipolytica

Titorenko, Vladimir I., Nicaud, Jean-Marc, Wang, Huijie, Chan, Honey and Rachubinski, Richard A. (2002) Acyl-CoA oxidase is imported as a heteropentameric, cofactor-containing complex into peroxisomes of Yarrowia lipolytica. The Journal of Cell Biology, 156 (3). pp. 481-494. ISSN 00219525

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Official URL: http://dx.doi.org/10.1083/jcb.200111075


Five isoforms of acyl-CoA oxidase (Aox), designated Aox1p to Aox5p, constitute a 443-kD heteropentameric complex containing one polypeptide chain of each isoform within the peroxisomal matrix of the yeast Yarrowia lipolytica. Assembly of the Aox complex occurs in the cytosol and precedes its import into peroxisomes. Peroxisomal targeting of the Aox complex is abolished in a mutant lacking the peroxin Pex5p, a component of the matrix protein targeting machinery. Import of the Aox complex into peroxisomes does not involve the cytosolic chaperone Pex20p, which mediates the oligomerization and import of peroxisomal thiolase. Aox2p and Aox3p play a pivotal role in the formation of the Aox complex in the cytosol and can substitute for one another in promoting assembly of the complex. In vitro, these subunits retard disassembly of the Aox complex and increase the efficiency of its reassembly. Neither Aox2p nor Aox3p is required for acquisition of the cofactor FAD by other components of the complex. We provide evidence that the Aox2p- and Aox3p-assisted assembly of the Aox complex in the cytosol is mandatory for its import into peroxisomes and that no component of the complex can penetrate the peroxisomal matrix as a monomer.

Divisions:Concordia University > Faculty of Arts and Science > Biology
Item Type:Article
Authors:Titorenko, Vladimir I. and Nicaud, Jean-Marc and Wang, Huijie and Chan, Honey and Rachubinski, Richard A.
Journal or Publication:The Journal of Cell Biology
Date:28 January 2002
Digital Object Identifier (DOI):10.1083/jcb.200111075
ID Code:7566
Deposited On:11 May 2011 16:54
Last Modified:18 Jan 2018 17:31


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