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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

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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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Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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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.
ROS generation is regulated and maintained at moderate levels necessary...
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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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Mitochondrial Membranes01:45

Mitochondrial Membranes

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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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Membrane permeable lipophilic cations as mitochondrial directing groups.

Joseph T Madak, Nouri Neamati1

  • 1Department of Medicinal Chemistry, College of Pharmacy, Translational Oncology Program, University of Michigan, North Campus Research Complex, 2800 Plymouth Road, Bldg 520, Ann Arbor, MI 48109, USA. neamati@umich.edu.

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Delocalized lipophilic cations (DLCs) target mitochondria for drug delivery. DLC-conjugated compounds show improved potency and drug properties for cancer therapy and reducing oxidative stress.

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Area of Science:

  • Mitochondrial biology
  • Drug discovery
  • Medicinal chemistry

Background:

  • Mitochondrial membrane potential drives accumulation of delocalized lipophilic cations (DLCs).
  • DLCs can be conjugated to bioactive compounds for targeted mitochondrial delivery.
  • Mitochondria are key targets for therapies affecting cell fate.

Purpose of the Study:

  • To review recent developments in DLC-targeted therapies.
  • To highlight applications in cytoprotective and cytotoxic treatments.
  • To discuss improvements in drug potency and pharmacokinetics.

Main Methods:

  • Literature review of recent advancements in DLC applications.
  • Analysis of DLC-conjugated compounds for therapeutic potential.
  • Examination of DLCs in modulating mitochondrial function.

Main Results:

  • DLCs effectively target mitochondria, enhancing drug localization and exposure.
  • DLC-conjugated therapies show improved potency and pharmacokinetic profiles.
  • DLCs offer potential to overcome drug resistance mechanisms in cancer.

Conclusions:

  • DLC-targeted therapies represent a promising strategy for drug discovery.
  • Applications span from reducing oxidative stress to initiating cancer cell death.
  • DLCs enhance therapeutic efficacy and overcome resistance, impacting cellular fate.