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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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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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Mitochondria01:37

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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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The Inner Mitochondrial Membrane01:28

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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...
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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.
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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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Understanding the Changes in Mitochondrial Morphology through Dynamic and Three-dimensional Fluorescence Micrographs
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Understanding the Changes in Mitochondrial Morphology through Dynamic and Three-dimensional Fluorescence Micrographs

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The mitochondrial paradox.

Sophie L Penman1,2, Rebecca L Jensen1,2, Robyn T Kiy1,2

  • 1MRC Centre for Drug Safety Science, University of Liverpool, Liverpool, United Kingdom.

Elife
|June 26, 2020
PubMed
Summary
This summary is machine-generated.

A common structural motif in two cancer drugs may explain both their effectiveness against cancer and their associated side effects. This finding could guide the development of safer, more targeted cancer therapies.

Keywords:
anti-cancer drugsbiochemistrycancer biologycardiac liabilitychemical biologyhumanmitochondriatoxicophore

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Area of Science:

  • Oncology
  • Medicinal Chemistry
  • Pharmacology

Background:

  • Cancer drug development often involves identifying specific molecular targets.
  • Understanding drug mechanisms of action is crucial for optimizing efficacy and minimizing toxicity.
  • Structural motifs can dictate a drug's interaction with biological systems.

Purpose of the Study:

  • To investigate the role of a specific structural motif present in two established cancer drugs.
  • To determine if this motif is responsible for both the anti-cancer activity and the observed side effects.
  • To provide insights for the design of novel anti-cancer agents.

Main Methods:

  • Comparative analysis of the chemical structures of two cancer drugs.
  • In silico modeling to predict drug-target interactions.
  • Review of preclinical and clinical data regarding drug efficacy and toxicity profiles.

Main Results:

  • A shared structural motif was identified in both drugs.
  • This motif appears to correlate with the drugs' ability to inhibit cancer cell growth.
  • The same motif is also implicated in the mechanism of common drug-related side effects.

Conclusions:

  • The identified structural motif is a key determinant of both therapeutic efficacy and toxicity for these cancer drugs.
  • Targeting or modifying this motif could lead to improved cancer treatments with reduced side effects.
  • Further research into this motif may unlock new strategies for precision oncology.