UBXN2A regulates nicotinic receptor degradation by modulating the E3 ligase activity of CHIP

Yanfen Teng, Khosrow Rezvani, Mariella De Biasi

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Neuronal nicotinic acetylcholine receptors (nAChRs) containing the α3 subunit are known for their prominent role in normal ganglionic transmission while their involvement in the mechanisms underlying nicotine addiction and smoking-related disease has been emerging only in recent years. The amount of information available on the maturation and trafficking of α3-containing nAChRs is limited. We previously showed that UBXN2A is a p97 adaptor protein that facilitates the maturation and trafficking of α3-containing nAChRs. Further investigation of the mechanisms of UBXN2A actions revealed that the protein interacts with CHIP (carboxyl terminus of Hsc70 interacting protein), whose ubiquitin E3 ligase activity regulates the degradation of several disease-related proteins. We show that CHIP displays E3 ligase activity toward the α3 nAChR subunit and contributes to its ubiquitination and subsequent degradation. UBXN2A interferes with CHIP-mediated ubiquitination of α3 and protects the nicotinic receptor subunit from endoplasmic reticulum associated degradation (ERAD). UBXN2A also cross-talks with VCP/p97 and HSC70/HSP70 proteins in a complex where α3 is likely to be targeted by CHIP. Overall,we identify CHIP as an E3 ligase for α3 and UBXN2A as a protein that may efficiently regulate the stability of CHIP's client substrates.

Original languageEnglish (US)
Pages (from-to)518-530
Number of pages13
JournalBiochemical Pharmacology
Volume97
Issue number4
DOIs
StatePublished - Oct 15 2015

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HSC70 Heat-Shock Proteins
Ubiquitin-Protein Ligases
Nicotinic Receptors
Degradation
Ubiquitination
Proteins
Endoplasmic Reticulum-Associated Degradation
Nicotine
Smoking

Keywords

  • a3 Nicotinic subunit CHIP p97 UBXN2A UBX domain Proteasomal degradation

ASJC Scopus subject areas

  • Biochemistry
  • Pharmacology

Cite this

UBXN2A regulates nicotinic receptor degradation by modulating the E3 ligase activity of CHIP. / Teng, Yanfen; Rezvani, Khosrow; De Biasi, Mariella.

In: Biochemical Pharmacology, Vol. 97, No. 4, 15.10.2015, p. 518-530.

Research output: Contribution to journalArticle

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