Alfy-dependent elimination of aggregated proteins by macroautophagy: can there be too much of a good thing?

Autophagy. 2011 Mar;7(3):346-50. doi: 10.4161/auto.7.3.14234.

Abstract

Degradation of different cargo by macroautophagy is emerging as a highly selective process which relies upon specific autophagy receptors and adapter molecules that link the cargo with the autophagic molecular machinery. We have recently reported that the large phsophatidylinositol-3-phosphate (PtdIns(3)P)-binding protein Alfy (Autophagy-linked FYVE protein) is required for selective degradation of aggregated proteins. Although depletion of Alfy inhibits Atg5-dependent aggregate degradation, overexpression of Alfy results in Atg5-dependent aggregate clearance and neuroprotection. Alfy-mediated degradation requires the ability of Alfy to directly interact with Atg5. This ability to interact with the core autophagic machinery may cause Alfy to diminish the responsiveness to nonselective autophagic degradation as measured by long-lived protein degradation. Thus, increasing Alfy-mediated protein degradation may be beneficial in some organs, but may be detrimental in others.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adaptor Proteins, Signal Transducing
  • Animals
  • Autophagy*
  • Autophagy-Related Proteins
  • HeLa Cells
  • Humans
  • Membrane Proteins / chemistry
  • Membrane Proteins / metabolism*
  • Mice
  • Models, Biological
  • Protein Structure, Quaternary
  • Protein Structure, Tertiary
  • Proteolysis*
  • Transcription Factors / chemistry
  • Transcription Factors / metabolism*

Substances

  • Adaptor Proteins, Signal Transducing
  • Autophagy-Related Proteins
  • Membrane Proteins
  • Transcription Factors
  • WDFY3 protein, human