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Protein Transport into the Inner Mitochondrial Membrane01:34

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Nuclear encoded mitochondrial precursors are imported to the inner membrane in a multistep process involving two separate translocons, TIM22 and TIM23. TIM23 is a cation-selective pore that remains closed by the N terminal segment of the protein. Negative charges on the TIM23 act as a receptor for the incoming precursor, pulling the positively charged matrix-targeting sequence for peptide insertion and translocation.
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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death.  Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
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Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
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Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
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Assessment of Submitochondrial Protein Localization in Budding Yeast Saccharomyces cerevisiae
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MTCH2 is a mitochondrial outer membrane protein insertase.

Alina Guna1, Taylor A Stevens2, Alison J Inglis2

  • 1Whitehead Institute for Biomedical Research, Massachusetts Institute of Technology, Cambridge, MA 02142, USA.

Science (New York, N.Y.)
|October 20, 2022
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Summary
This summary is machine-generated.

Mitochondrial outer membrane protein MTCH2 acts as an insertase, facilitating the proper localization of various proteins. This discovery explains MTCH2 dysfunction

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Mitochondrial outer membrane proteins are crucial for cell signaling.
  • The mechanisms for inserting diverse protein types into this membrane remain incompletely understood.

Purpose of the Study:

  • To identify and characterize the protein responsible for inserting tail-anchored, signal-anchored, and multipass proteins into the mitochondrial outer membrane.
  • To elucidate the function and evolutionary origin of this protein.

Main Methods:

  • Genome-wide CRISPR screens were employed to identify key proteins.
  • Protein purification and reconstitution into proteoliposomes were performed.
  • Functional and mutational analyses were conducted.

Main Results:

  • Mitochondrial carrier homolog 2 (MTCH2) was identified as essential for inserting various transmembrane proteins, excluding beta-barrel proteins.
  • Purified MTCH2 demonstrated sufficiency in mediating protein insertion in vitro.
  • MTCH2 functions as a gatekeeper, preventing mislocalization and influencing cellular processes like apoptosis.

Conclusions:

  • MTCH2 functions as a novel protein insertase in the mitochondrial outer membrane.
  • Its role as a gatekeeper impacts protein localization and cellular sensitivity to apoptosis.
  • Understanding MTCH2 provides mechanistic insights into disease states linked to its dysfunction.