Sorting, recognition and activation of the misfolded protein degradation pathways through macroautophagy and the proteasome

Wen Xing Ding, Xiao-Ming Yin

Research output: Contribution to journalArticle

242 Citations (Scopus)

Abstract

Based on a functional categorization, proteins may be grouped into three types and sorted to either the proteasome or the macroautophagy pathway for degradation. The two pathways are mechanistically connected but their capacity seems different. Macroautophagy can degrade all forms of misfolded proteins whereas proteasomal degradation is likely limited to soluble ones. Unlike the bulk protein degradation that occurs during starvation, autophagic degradation of misfolded proteins can have a degree of specificity, determined by ubiquitin modification and the interactions of p62/SQSTM1 and HDAC6. Macroautophagy is initiated in response to endoplasmic reticulum (ER) stress caused by misfolded proteins, via the ER-activated autophagy (ERAA) pathway, which activates a partial unfolded protein response involving PERK and/or IRE1, and a calcium-mediated signaling cascade. ERAA serves the function of mitigating ER stress and suppressing cell death, which may be explored for controlling protein conformational diseases. Conversely, inhibition of ERAA may be explored for sensitizing resistant tumor cells to cytotoxic agents.

Original languageEnglish (US)
Pages (from-to)141-150
Number of pages10
JournalAutophagy
Volume4
Issue number2
StatePublished - Feb 16 2008
Externally publishedYes

Fingerprint

Autophagy
Proteasome Endopeptidase Complex
Proteolysis
Endoplasmic Reticulum Stress
Proteins
Unfolded Protein Response
Calcium Signaling
Cytotoxins
Ubiquitin
Starvation
Endoplasmic Reticulum
Cell Death
Neoplasms

Keywords

  • Apoptosis
  • Cancer
  • Conformational disease
  • Endoplasmic reticulum stress
  • ER-associated degradation
  • Macroautophagy
  • Misfolded proteins
  • Neurodegenerative disease
  • Proteasome
  • Unfolded protein response

ASJC Scopus subject areas

  • Cell Biology
  • Molecular Biology

Cite this

Sorting, recognition and activation of the misfolded protein degradation pathways through macroautophagy and the proteasome. / Ding, Wen Xing; Yin, Xiao-Ming.

In: Autophagy, Vol. 4, No. 2, 16.02.2008, p. 141-150.

Research output: Contribution to journalArticle

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