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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,...
Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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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 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.
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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 Precursor Proteins01:39

Mitochondrial Precursor Proteins

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Sequence-specific Labeling of Nucleic Acids and Proteins with Methyltransferases and Cofactor Analogues
12:07

Sequence-specific Labeling of Nucleic Acids and Proteins with Methyltransferases and Cofactor Analogues

Published on: November 22, 2014

MidA is a putative methyltransferase that is required for mitochondrial complex I function.

Sergio Carilla-Latorre1, M Esther Gallardo, Sarah J Annesley

  • 1Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Arturo Duperier 4, 28029 Madrid, Spain.

Journal of Cell Science
|April 22, 2010
PubMed
Summary

Dictyostelium and human MidA proteins are crucial for mitochondrial complex I assembly and stability. Loss of MidA impairs complex I, leading to cellular defects mediated by AMPK signaling.

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Area of Science:

  • Mitochondrial biology
  • Cellular signaling
  • Protein biochemistry

Background:

  • Dictyostelium and human MidA proteins belong to the DUF185 family with unknown function.
  • Mitochondrial complex I is essential for cellular respiration.

Purpose of the Study:

  • To investigate the function of MidA proteins.
  • To determine the role of MidA in mitochondrial complex I.
  • To understand the phenotypic consequences of MidA deficiency.

Main Methods:

  • Yeast two-hybrid screening and pull-down assays to identify protein interactions.
  • Biochemical assays to measure complex I activity.
  • Cellular studies (knockdown, gene deletion) in HEK293T cells and Dictyostelium.
  • Structural bioinformatics and site-directed mutagenesis to analyze protein domains.
  • Analysis of cellular phenotypes including phototaxis and thermotaxis.

Main Results:

  • MidA interacts with the mitochondrial complex I subunit NDUFS2.
  • Loss or knockdown of MidA leads to reduced complex I activity and assembly.
  • MidA possesses a methyltransferase domain essential for its function.
  • MidA deficiency in Dictyostelium causes phototaxis and thermotaxis defects.
  • These defects are linked to chronic activation of AMP-activated protein kinase (AMPK).

Conclusions:

  • MidA plays a vital role in the assembly or stability of mitochondrial complex I.
  • MidA's function is linked to its methyltransferase activity.
  • MidA deficiency impacts cellular behaviors through AMPK signaling pathways, highlighting a role for AMPK in complex I cytopathology.