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Related Concept Videos

Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
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Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

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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.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
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Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

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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.
Most of the mitochondrial...
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Porin Insertion in the Outer Mitochondrial Membrane01:12

Porin Insertion in the Outer Mitochondrial Membrane

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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.
Three models describe the assembly of porins by the SAM complex and their insertion into the outer membrane. Model 1 suggests that porins are assembled outside the SAM channel as the...
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Protein Transport into the Inner Mitochondrial Membrane01:34

Protein Transport into the Inner Mitochondrial Membrane

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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.
Transport of mitochondrial precursors across the TIM23 channel is driven by...
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Structure of Porins01:21

Structure of Porins

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Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a  motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
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Updated: Jun 4, 2025

Measurement of Protein Import Capacity of Skeletal Muscle Mitochondria
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Measurement of Protein Import Capacity of Skeletal Muscle Mitochondria

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Mitochondrial-derived microproteins: from discovery to function.

Kelvin Yen1, Brendan Miller2, Hiroshi Kumagai1

  • 1Leonard Davis School of Gerontology, University of Southern California, Los Angeles, CA, USA.

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|December 17, 2024
PubMed
Summary
This summary is machine-generated.

Mitochondria-derived microproteins (MDPs) are unique proteins encoded by the mitochondrial genome. Studying these novel MDPs is crucial for understanding mitochondrial health and discovering new therapeutic targets.

Keywords:
agingmicroproteinmitochondria

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Area of Science:

  • Mitochondrial biology
  • Molecular and cellular biology
  • Genomics

Background:

  • Mitochondria possess their own genome, distinguishing them from other cellular components.
  • Mitochondrial-derived microproteins (MDPs) are a novel class of proteins originating from this unique organelle.
  • The increasing discovery of MDPs highlights their potential significance in cellular and organismal health.

Purpose of the Study:

  • To review the history and discovery of MDPs.
  • To describe the known functions of individual MDPs.
  • To outline future research directions and techniques for discovering additional MDPs.

Main Methods:

  • Literature review of MDP discovery and function.
  • Analysis of existing research on mitochondrial genomics and proteomics.
  • Discussion of emerging techniques for microprotein identification.

Main Results:

  • The review covers the historical context of MDP identification.
  • Detailed descriptions of the functions of currently identified MDPs are provided.
  • The importance of MDPs in various biological processes is highlighted.

Conclusions:

  • MDPs represent a significant area of research with therapeutic potential.
  • Further investigation into MDPs is warranted to fully understand their roles.
  • Advanced techniques will be crucial for future MDP discovery and characterization.