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Related Concept Videos

Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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,...
Protein Transport into the Inner Mitochondrial Membrane01:34

Protein Transport into the Inner Mitochondrial Membrane

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...
Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

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...
Lipid Catabolism01:25

Lipid Catabolism

Triglycerides serve as crucial long-term energy storage molecules in microorganisms, providing a dense source of metabolic energy. Their breakdown is mediated by lipases, which hydrolyze triglycerides into glycerol and free fatty acids. Each of these components follows distinct metabolic pathways, ultimately contributing to ATP synthesis and cellular energy homeostasis.Glycerol MetabolismGlycerol, released from triglyceride hydrolysis, is phosphorylated by glycerol kinase to form...
The Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
Mitochondrial Membranes01:45

Mitochondrial Membranes

A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...

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Related Experiment Video

Updated: May 8, 2026

Lipid Droplet Isolation for Quantitative Mass Spectrometry Analysis
10:23

Lipid Droplet Isolation for Quantitative Mass Spectrometry Analysis

Published on: April 17, 2017

Mitochondrial lipid trafficking.

Takashi Tatsuta1, Melanie Scharwey1, Thomas Langer2

  • 1Institute for Genetics, Cologne Excellence Cluster on Cellular Stress Responses in Aging Associated Diseases (CECAD), Center for Molecular Medicine (CMMC), University of Cologne, 50674 Cologne, Germany.

Trends in Cell Biology
|September 5, 2013
PubMed
Summary
This summary is machine-generated.

Mitochondria rely on lipid transport from the endoplasmic reticulum (ER). New research reveals mechanisms like membrane-tethering complexes and lipid-transfer proteins involved in mitochondrial lipid trafficking and cell homeostasis.

Keywords:
Ups1/PRELIlipid-transfer proteinsmembrane-contact sitesmembrane-tethering complexesmitochondriaphospholipids

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Isolation of Cellular Lipid Droplets: Two Purification Techniques Starting from Yeast Cells and Human Placentas
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Isolation of Cellular Lipid Droplets: Two Purification Techniques Starting from Yeast Cells and Human Placentas

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Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy
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Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy

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Related Experiment Videos

Last Updated: May 8, 2026

Lipid Droplet Isolation for Quantitative Mass Spectrometry Analysis
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Published on: April 17, 2017

Isolation of Cellular Lipid Droplets: Two Purification Techniques Starting from Yeast Cells and Human Placentas
09:41

Isolation of Cellular Lipid Droplets: Two Purification Techniques Starting from Yeast Cells and Human Placentas

Published on: April 1, 2014

Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy
07:20

Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy

Published on: January 31, 2025

Area of Science:

  • Cell Biology
  • Mitochondrial Biology
  • Lipid Metabolism

Background:

  • Mitochondria possess a unique lipid composition, with key lipids synthesized in the endoplasmic reticulum (ER).
  • Cardiolipin and phosphatidylethanolamine synthesis within mitochondria underscore their critical role in cellular lipid metabolism.
  • Significant lipid and precursor exchange occurs between the ER and mitochondria, and between mitochondrial membranes.

Purpose of the Study:

  • To summarize current knowledge on lipid trafficking to and within mitochondria.
  • To discuss emerging models for the mechanisms governing mitochondrial lipid transfer.
  • To highlight the importance of lipid transport for mitochondrial function and cellular balance.

Main Methods:

  • Review of existing literature on mitochondrial lipid metabolism and transport.
  • Analysis of recent findings on membrane-tethering complexes and lipid-transfer proteins.
  • Discussion of proposed mechanisms for lipid exchange between organelles.

Main Results:

  • Lipids are primarily synthesized in the ER and transported to mitochondria.
  • Mitochondria actively synthesize specific lipids like cardiolipin and phosphatidylethanolamine.
  • Identification of novel protein complexes and transfer proteins mediating lipid transport.

Conclusions:

  • Lipid trafficking is essential for mitochondrial function and overall cell homeostasis.
  • Emerging protein machinery provides mechanistic insights into mitochondrial lipid transport.
  • Further research into these mechanisms will deepen our understanding of cellular lipid metabolism.