pH-dependent regulation of SQSTM1/p62 during autophagy

Do Hoon Kwon, Leehyeon Kim, Hyun Kyu Song

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

During macroautophagy/autophagy, SQSTM1/p62 plays dual roles as a key mediator of cargo selection and as an autophagic substrate. SQSTM1 links N-degrons and/or ubiquitinated cargoes to the autophagosome by forming homo- or hetero-oligomers, although its N-degron recognition and oligomerization mechanisms are not well characterized. We recently found that SQSTM1 is a novel type of N-recognin whose ZZ domain provides a negatively-charged binding pocket for Arg-charged N-degron (Nt-Arg), a prototype type-1 substrate. Although differences in binding affinity exist for each N-degron, SQSTM1 also interacts with type-2 N-degrons, such as Nt-Tyr and Nt-Trp. Intriguingly, interactions between SQSTM1’s ZZ domain and various N-degrons are greatly influenced by pH-dependent SQSTM1 oligomerization via its PB1 domain. Because cellular pH conditions vary from neutral to acidic depending on the stage of autophagy, the pH-dependent regulation of SQSTM1’s oligomerization must be tightly coupled with the autophagic process.

Original languageEnglish
JournalAutophagy
DOIs
Publication statusAccepted/In press - 2018 Jan 1

Keywords

  • Aggrephagy
  • autophagy adaptor
  • HSPA5/BiP/GRP78
  • N-end rule
  • pH-dependent oligomerization
  • UBR box

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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