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Methods to Study Lysosomal AMPK Activation.

C-S Zhang1, M Li1, S-C Lin1

  • 1State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Xiamen, China.

Methods in Enzymology
|March 4, 2017
PubMed
Summary
This summary is machine-generated.

AMP-activated protein kinase (AMPK) activation involves AXIN binding to LKB1 on lysosomes, a process crucial for metabolic homeostasis. This mechanism, involving the v-ATPase-Ragulator complex, offers new insights into AMPK regulation during metabolic stress.

Keywords:
AMPKAXINDetergent-resistant membraneLate endosome/lysosomeLight organellesRagulatorv-ATPase

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Area of Science:

  • Cell Biology
  • Metabolic Regulation
  • Molecular Biology

Background:

  • AMP-activated protein kinase (AMPK) is a key regulator of cellular energy balance.
  • AMPK is traditionally understood to be activated by LKB1 (liver kinase B1) phosphorylation at Thr172, stimulated by high AMP/ATP ratios.

Purpose of the Study:

  • To summarize methods for studying the translocation of AXIN/LKB1 to lysosomal membranes.
  • To outline assays for assessing AMPK-activating complex assembly on lysosomes.
  • To provide tools for investigating the role of the v-ATPase-Ragulator-AXIN/LKB1 axis in AMPK activation.

Main Methods:

  • Assays for translocation of AXIN/LKB1 to detergent-resistant lipid fractions of lysosomal membranes.
  • Methods for analyzing the assembly of AMPK-activating complexes on lysosomes.

Main Results:

  • Recent findings reveal AXIN binds LKB1, tethering it to AMPK on lysosomes during glucose starvation.
  • The v-ATPase-Ragulator complex is implicated in this lysosomal AMPK activation pathway.
  • This lysosomal pathway is paradoxically linked to mTORC1 activation, despite their inverse relationship.

Conclusions:

  • The v-ATPase-Ragulator-AXIN/LKB1 axis represents a novel mechanism for AMPK activation.
  • The described experimental procedures are valuable for studying AMPK activation under various metabolic conditions.
  • Understanding this pathway is critical for metabolic research and therapeutic development.