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Mapping protein interactions in the active TOM-TIM23 supercomplex.

Ridhima Gomkale1, Andreas Linden2,3, Piotr Neumann4

  • 1Department of Cellular Biochemistry, University Medical Center Göttingen, Göttingen, Germany.

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This summary is machine-generated.

Researchers mapped the TOM-TIM23 protein transport pathway. They visualized how proteins move between mitochondrial membranes, clarifying the intermembrane space interface and import motor interactions.

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Area of Science:

  • Mitochondrial protein import
  • Molecular cell biology
  • Membrane transport

Background:

  • Nuclear-encoded mitochondrial proteins require translocation across the outer and inner mitochondrial membranes.
  • The TOM (translocase of the outer membrane) and TIM23 (translocase of the inner membrane) complexes mediate matrix protein import.
  • The precise organization and function of the TOM-TIM23 transition zone remain poorly understood.

Purpose of the Study:

  • To investigate the molecular organization of the TOM-TIM23 transition zone.
  • To elucidate the mechanism of precursor protein transfer between TOM and TIM23 complexes.
  • To map the interactions at the intermembrane space (IMS) interface during mitochondrial protein transport.

Main Methods:

  • Design of a stalled translocation intermediate precursor protein.
  • Chemical cross-linking coupled with mass spectrometry (MS).
  • Structural modeling and computational analysis.

Main Results:

  • Visualized the molecular environment at the TOM-TIM23 intermembrane space interface.
  • Mapped interactions between the import motor and the translocating precursor.
  • Provided high-resolution insights into the presequence handover mechanism.

Conclusions:

  • Established a framework for understanding protein transfer between TOM and TIM23.
  • Detailed the molecular basis of precursor recognition and translocation across mitochondrial membranes.
  • Advanced the understanding of mitochondrial protein import pathways.