TFEB regulates lysosomal positioning by modulating TMEM55B expression and JIP4 recruitment to lysosomes

Nat Commun. 2017 Nov 17;8(1):1580. doi: 10.1038/s41467-017-01871-z.

Abstract

Lysosomal distribution is linked to the role of lysosomes in many cellular functions, including autophagosome degradation, cholesterol homeostasis, antigen presentation, and cell invasion. Alterations in lysosomal positioning contribute to different human pathologies, such as cancer, neurodegeneration, and lysosomal storage diseases. Here we report the identification of a novel mechanism of lysosomal trafficking regulation. We found that the lysosomal transmembrane protein TMEM55B recruits JIP4 to the lysosomal surface, inducing dynein-dependent transport of lysosomes toward the microtubules minus-end. TMEM55B overexpression causes lysosomes to collapse into the cell center, whereas depletion of either TMEM55B or JIP4 results in dispersion toward the cell periphery. TMEM55B levels are transcriptionally upregulated following TFEB and TFE3 activation by starvation or cholesterol-induced lysosomal stress. TMEM55B or JIP4 depletion abolishes starvation-induced retrograde lysosomal transport and prevents autophagosome-lysosome fusion. Overall our data suggest that the TFEB/TMEM55B/JIP4 pathway coordinates lysosome movement in response to a variety of stress conditions.

Publication types

  • Research Support, N.I.H., Intramural

MeSH terms

  • Adaptor Proteins, Signal Transducing / genetics
  • Adaptor Proteins, Signal Transducing / metabolism*
  • Animals
  • Basic Helix-Loop-Helix Leucine Zipper Transcription Factors / genetics
  • Basic Helix-Loop-Helix Leucine Zipper Transcription Factors / metabolism*
  • COS Cells
  • Cell Line, Tumor
  • Chlorocebus aethiops
  • Gene Expression Regulation
  • HeLa Cells
  • Humans
  • Lysosomal Membrane Proteins / metabolism
  • Lysosomes / metabolism*
  • Microtubules / physiology
  • Phosphoinositide Phosphatases / genetics
  • Phosphoinositide Phosphatases / metabolism*
  • Protein Transport / genetics
  • Protein Transport / physiology
  • RNA Interference
  • RNA, Small Interfering / genetics
  • Vesicular Transport Proteins / genetics
  • Vesicular Transport Proteins / metabolism*

Substances

  • Adaptor Proteins, Signal Transducing
  • Basic Helix-Loop-Helix Leucine Zipper Transcription Factors
  • Lysosomal Membrane Proteins
  • RNA, Small Interfering
  • SPAG9 protein, human
  • TFE3 protein, human
  • TFEB protein, human
  • Vesicular Transport Proteins
  • Phosphoinositide Phosphatases
  • PIP4P1 protein, human