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OPA1 cleavage depends on decreased mitochondrial ATP level and bivalent metals

Laurent Baricault1, Bruno Ségui, Laurie Guégand

  • 1LBCMCP, CNRS, Université de Toulouse, France. baricaul@cict.fr

Experimental Cell Research
|September 11, 2007
PubMed

Insights

Decreased mitochondrial ATP levels, not apoptosis or membrane potential changes, trigger OPA1 protein processing. Iron activates and zinc inhibits this crucial OPA1 cleavage, linking metabolism to mitochondrial dynamics.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Mitochondrial Dynamics

Background:

  • OPA1 (Optic Atrophy 1) is a GTPase crucial for mitochondrial membrane dynamics.
  • OPA1 processing is linked to mitochondrial network organization, apoptosis, and membrane potential (DeltaPsi(m)).

Purpose of the Study:

  • To identify the primary stimulus regulating OPA1 amino-terminal cleavage.
  • To elucidate the relationship between cellular energy status and OPA1 processing.

Main Methods:

  • In vitro analysis using purified mitochondrial fractions.
  • Application of mitochondrial targeting drugs to induce specific cellular conditions.
  • Assessment of OPA1 cleavage under varying ATP levels, DeltaPsi(m), and ion concentrations.

Main Results:

  • Apoptosis induction, PTP opening, and DeltaPsi(m) dissipation all induce OPA1 cleavage.
  • Reduced mitochondrial ATP levels, irrespective of the cause (apoptosis, DeltaPsi(m) dissipation, ATP synthase inhibition), are the central stimulus for OPA1 processing.
  • Ectopic iron addition promotes OPA1 cleavage, while zinc addition inhibits it.

Conclusions:

  • ATP-dependent OPA1 processing is a key mechanism linking cellular energy metabolism to mitochondrial dynamics.
  • Dysregulation of OPA1 processing due to altered ATP, iron, or zinc levels may contribute to disease pathophysiology.

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