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Pexophagy-linked degradation of the peroxisomal membrane protein Pex3p involves the ubiquitin-proteasome system

, : Pexophagy-linked degradation of the peroxisomal membrane protein Pex3p involves the ubiquitin-proteasome system. Biochemical and Biophysical Research Communications 438(2): 395-401

Peroxisome autophagy, also known as Pexophagy, describes the wholesale degradation of peroxisomes via the vacuole, when organelles become damaged or redundant. In the methylotrophic yeast H. polymorpha, pexophagy is stimulated when cells growing on methanol are exposed to excess glucose. Degradation of the peroxisomal membrane protein Pex3p, a process that does not involve the vacuole, was shown to trigger pexophagy. In this contribution, we have characterised pexophagy-associated Pex3p degradation further. We show that Pex3p breakdown depends on ubiquitin and confirm that Pex3p is a target for ubiquitination. Furthermore, we identify a role for the peroxisomal E3 ligases Pex2p and Pex10p in Pex3p degradation, suggesting the existence of a ubiquitin-dependent pathway involved in removing proteins from the peroxisomal membrane.

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Accession: 037280268

PMID: 23899522

DOI: 10.1016/j.bbrc.2013.07.086

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