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Related Concept Videos

Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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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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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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Translation01:31

Translation

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Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
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Translation01:31

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Lesson: Translation
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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.
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Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
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Targeted Next-generation Sequencing and Bioinformatics Pipeline to Evaluate Genetic Determinants of Constitutional Disease
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LRRK2 G2019S mutation contributes to mitochondrial transfer dysfunction in a Drp1-STX17-dependent manner.

Mei Ding1,2, Fen Wang1,3, Lan-Lan Jiang1

  • 1Department of Neurology and Clinical Research Center of Neurological Disease, The Second Affiliated Hospital of Soochow University, Suzhou, China.

Translational Neurodegeneration
|December 7, 2025
PubMed
Summary

Mitochondrial transfer impairment is linked to Parkinson's disease (PD) LRRK2 G2019S mutation. Inhibiting Drp1 phosphorylation may protect neurons by restoring mitochondrial transfer.

Keywords:
LRRK2 G2019S mutationAstrocyteDopaminergic neuronInduced pluripotent stem cellMembrane fusion-related protein STX17Mitochondrial transferParkinson’s disease

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Genetics

Background:

  • Astrocytes transfer mitochondria to dopaminergic (DA) neurons as a neuroprotective mechanism in Parkinson's disease (PD).
  • LRRK2 G2019S is the most common mutation linked to PD.
  • This study investigates how genetic and environmental factors affect mitochondrial transfer and its role in LRRK2 G2019S pathogenesis.

Purpose of the Study:

  • To explore the influence of genetic and environmental factors on mitochondrial transfer.
  • To determine if impaired mitochondrial transfer is a mechanism in LRRK2 G2019S-related PD.
  • To elucidate the molecular pathways involved in LRRK2 G2019S-associated mitochondrial dysfunction.

Main Methods:

  • Differentiated DA neurons and astrocytes from induced pluripotent stem cells of healthy and PD patients (LRRK2 G2019S).
  • Established a co-culture system to study pathogenic mechanisms.
  • Utilized rotenone exposure and genetic manipulation (STX17 knockdown) to assess mitochondrial transfer.

Main Results:

  • Rotenone exposure impaired astrocyte-to-neuron mitochondrial transfer.
  • LRRK2 G2019S mutation exacerbated rotenone-induced damage.
  • Drp1-STX17 pathway mediates mitochondrial transfer; Drp1 phosphorylation at Ser616 is increased in mutant astrocytes upon rotenone exposure, impairing transfer.

Conclusions:

  • Impaired mitochondrial transfer is a potential pathogenic mechanism in LRRK2 G2019S PD.
  • Mitochondrial transfer involves a Drp1-STX17-dependent pathway.
  • Inhibitors targeting Drp1 Ser616 phosphorylation show potential for neuroprotection in PD by improving mitochondrial transfer.