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Related Concept Videos

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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Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

3.0K
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,...
3.0K
Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

4.3K
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...
4.3K
Protein Transport into the Inner Mitochondrial Membrane01:34

Protein Transport into the Inner Mitochondrial Membrane

3.6K
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...
3.6K
Energy to Drive Translocation01:37

Energy to Drive Translocation

2.0K
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.
Generally, polypeptides are unfolded by two distinct...
2.0K
Porin Insertion in the Outer Mitochondrial Membrane01:12

Porin Insertion in the Outer Mitochondrial Membrane

2.8K
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...
2.8K

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Related Experiment Video

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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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Quantifying mitochondrial protein import by mePRODmt proteomics.

Süleyman Bozkurt1, Bhavesh S Parmar1, Christian Münch2

  • 1Institute of Molecular Systems Medicine, Faculty of Medicine, Goethe University, Frankfurt am Main, Germany.

Methods in Enzymology
|October 25, 2024
PubMed
Summary
This summary is machine-generated.

We developed mitochondria-specific multiplexed enhanced protein dynamics (mePRODmt) to study how proteins move into mitochondria. This new method offers a dynamic view of mitochondrial proteostasis, improving disease research.

Keywords:
Mass spectrometryMitochondriaMitochondrial protein importProteomicsSILACTMT multiplexTranslationmePRODpSILAC

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Proteomics

Background:

  • Mitochondrial protein import is vital for cellular function and homeostasis.
  • Dysregulation of mitochondrial protein import is implicated in various diseases.
  • Existing methods lack the dynamic resolution to fully capture mitochondrial proteostasis.

Purpose of the Study:

  • To introduce mitochondria-specific multiplexed enhanced protein dynamics (mePRODmt) for studying transient mitochondrial protein import.
  • To provide a detailed protocol for the mePRODmt technique.
  • To enhance the understanding of mitochondrial protein trafficking and proteostasis.

Main Methods:

  • Utilized pulsed stable isotope labeling with amino acids in cell culture (pSILAC) proteomics.
  • Incorporated heavy SILAC-labeled peptides as boosters for enhanced mitochondrial peptide signals.
  • Employed tandem mass tags (TMT) for isobaric labeling in multiplex proteomics.
  • Detailed liquid chromatography-mass spectrometry (LC-MS) settings for reporter ion quantitation.
  • Established a data analysis pipeline for pSILAC-TMT data.

Main Results:

  • The mePRODmt protocol enables dynamic analysis of mitochondrial protein import.
  • The method allows for multiplexed quantitative proteomics of mitochondrial proteins.
  • Optimized LC-MS and data analysis strategies ensure accurate quantitation.

Conclusions:

  • mePRODmt offers a powerful, dynamic approach to study mitochondrial protein import.
  • This technique advances the study of mitochondrial proteostasis and its role in disease.
  • The protocol provides a comprehensive framework for researchers in the field.