Role of chaperone-mediated autophagy in degrading Huntington's disease-associated huntingtin protein

Lin Qi, Xing Ding Zhang*

*Corresponding author for this work

Research output: Contribution to journalReview article

15 Scopus citations

Abstract

Mutant N-terminal huntingtin (Htt) protein resulting from Huntington's disease (HD) with expanded polyglutamine accumulates and forms aggregates in vulnerable neurons. Both ubiquitin proteasomal and autophagic pathways contribute to the degradation of mutant Htt. Here, we focus on the involvement of chaperone-mediated autophagy (CMA), a selective form of autophagy in the clearance of Htt. Selective catabolism in CMA is conferred by the presence of a KFERQ-like targeting motif in the substrates, by which molecular chaperones recognize the hydrophobic surfaces of the misfolded substrates, and transfer them to the lysosomal membrane protein type-2A, LAMP-2A. The substrates are taken into the lysosomes through LAMP-2A and are rapidly degraded by the lysosomal enzymes. Taken together, we summarize the recent evidence to elucidate that Htt is also a potential substrate of CMA. We propose that the manipulation of CMA could be a therapeutic strategy for HD.

Original languageEnglish (US)
Pages (from-to)83-91
Number of pages9
JournalActa biochimica et biophysica Sinica
Volume46
Issue number2
DOIs
StatePublished - Feb 1 2014

Keywords

  • Huntington's disease (HD)
  • chaperone-mediated autophagy (CMA)
  • chaperones
  • lysosome-associated membrane protein 2A (LAMP-2A)

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry

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