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MTCH2 cooperates with MFN2 and lysophosphatidic acid synthesis to sustain mitochondrial fusion

Andres Goldman1, Michael Mullokandov2, Yehudit Zaltsman2

  • 1Montreal Neurological Institute, McGill University, Montreal, Canada. andres.goldman@mcgill.ca.

EMBO Reports
|January 4, 2024
PubMed

Insights

Mitochondrial fusion relies on mitofusins (MFN1/MFN2) and MTCH2. This study reveals MTCH2 needs MFN1 for fusion and MFN2 compensates for MTCH2 loss, uncovering two key fusion mechanisms.

Area of Science:

  • Cell Biology
  • Mitochondrial Dynamics
  • Membrane Fusion

Background:

  • Outer mitochondrial membrane (OMM) fusion is regulated by mitofusins (MFN1, MFN2).
  • The precise role of Mitochondrial carrier homolog 2 (MTCH2) in mitochondrial fusion is unclear.
  • MTCH2 may influence fusion via lysophosphatidic acid (LPA) and glycerol-phosphate acyl transferases (GPATs).

Purpose of the Study:

  • To elucidate the differential roles of MFN1 and MFN2 in MTCH2-mediated mitochondrial fusion.
  • To investigate the interplay between MTCH2, mitofusins, and GPATs in maintaining mitochondrial fusion.
  • To understand the mechanisms sustaining mitochondrial fusion under various conditions.

Main Methods:

  • Genetic manipulation of MTCH2, MFN1, MFN2, and GPATs.
  • Pharmacological inhibition of GPATs (GPATi).
  • Assessment of mitochondrial morphology and fusion dynamics.

Main Results:

  • MTCH2 requires MFN1 for promoting mitochondrial fusion.
  • MFN2 overexpression compensates for MTCH2 loss, partially independent of GTPase activity and localization.
  • GPAT inhibition or silencing impairs MFN2's compensatory ability.
  • Combined loss of MTCH2 and GPATi, or MTCH2 and MFN2, impairs stress-induced fusion.

Conclusions:

  • MTCH2 and MFN1 cooperate to drive mitochondrial fusion.
  • MFN2 plays a crucial role in compensating for MTCH2 loss, involving GPAT activity.
  • Two cooperative mechanisms involving MTCH2, MFN2, and GPATs sustain mitochondrial fusion.
Keywords:
LPAMFN2MTCH2Mitochondria-ER CommunicationMitochondrial Fusion

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