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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,...
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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Animal Mitochondrial Genetics

Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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Mitochondrial Precursor Proteins

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 precursors...
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,...
Mitochondrial Membranes01:45

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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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Matrix proteases in mitochondrial DNA function.

Yuichi Matsushima1, Laurie S Kaguni

  • 1Department of Mental Retardation & Birth Defect Research, National Institute of Neuroscience, National Center of Neurology & Psychiatry, Tokyo 187-8502, Japan.

Biochimica Et Biophysica Acta
|December 17, 2011
PubMed
Summary

Mitochondrial proteases Lon, ClpXP, and m-AAA maintain quality control and are involved in mitochondrial DNA (mtDNA) functions. This review focuses on Lon protease

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Area of Science:

  • Mitochondrial biology
  • Molecular genetics

Background:

  • Mitochondrial matrix contains three ATP-dependent proteases: Lon, ClpXP, and m-AAA.
  • These proteases are crucial for degrading damaged proteins and maintaining mitochondrial quality control.
  • Emerging evidence suggests their involvement in mitochondrial DNA (mtDNA) functions.

Purpose of the Study:

  • To review the role of Lon protease in mitochondrial DNA functions.
  • To discuss the potential degradation of mitochondrial transcription factor A (TFAM) by Lon protease.
  • To explore the roles of m-AAA and ClpXP in mtDNA functions and identify their substrates.

Main Methods:

  • Literature review of existing research on mitochondrial proteases and mtDNA.
  • Analysis of proposed functions and substrates for Lon, ClpXP, and m-AAA.
  • Discussion of physiological implications and candidate substrates.

Main Results:

  • Lon protease plays a significant role in mtDNA metabolism across various species.
  • TFAM is a putative substrate for Lon protease, suggesting a role in regulating mtDNA transcription.
  • m-AAA and ClpXP proteases may also influence mtDNA stability and replication.

Conclusions:

  • Mitochondrial proteases are key regulators of both protein homeostasis and mtDNA metabolism.
  • Lon protease's interaction with TFAM highlights a novel mechanism in mitochondrial gene expression.
  • Further research is needed to fully elucidate the roles of these proteases in mtDNA maintenance and function.