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Related Concept Videos

ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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Mitochondrial Precursor Proteins01:39

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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.
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The ADP/ATP Carrier Protein01:42

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ADP/ATP carrier or AAC protein is the most abundant carrier protein in the inner mitochondrial membrane. It transports large quantities of ADP and ATP, equivalent to the average human body weight, every day. Among other transporters, ACC protein is one of the best-studied members of the mitochondrial carrier protein family. The ADP/ATP carrier protein comprises two transmembrane helices connected to a loop and a single alpha-helix on the matrix side. It switches between two conformational...
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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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Mitochondria01:37

Mitochondria

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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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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.
Sorting of outer membrane proteins:
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Related Experiment Video

Updated: Jun 3, 2025

Reconstitution of Msp1 Extraction Activity with Fully Purified Components
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ATAD1 Regulates Neuronal Development and Synapse Formation Through Tuning Mitochondrial Function.

Hao-Hao Yan1,2,3, Jia-Jia He1, Chuanhai Fu1

  • 1Hefei National Laboratory for Physical Sciences at the Microscale, MOE Key Laboratory for Membrane-Less Organelles & Cellular Dynamics, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China.

International Journal of Molecular Sciences
|January 11, 2025
PubMed
Summary
This summary is machine-generated.

The AAA+ protease ATAD1 is vital for neuronal mitochondria quality control. Its loss impairs synaptic function and neurodevelopment, independent of mitochondrial shape but dependent on ATP hydrolysis.

Keywords:
ATAD1mitochondrial dysfunctionneuronal developmentsynapse formation

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Mitochondrial Biology

Background:

  • Mitochondrial function is critical for neuronal health and synaptic plasticity.
  • ATAD1, an AAA+ protease, plays a role in mitochondrial quality control, but its neuronal distribution and function are unclear.

Purpose of the Study:

  • To investigate the localization and function of ATAD1 in hippocampal neurons.
  • To elucidate the role of ATAD1 in mitochondrial dynamics, neurodevelopment, and synaptic transmission.

Main Methods:

  • Immunofluorescence microscopy to determine ATAD1 localization in cultured hippocampal neurons.
  • Analysis of mitochondrial morphology, dendritic branching, and spine maturation in ATAD1-deficient neurons.
  • Electrophysiological recordings to assess glutamatergic synaptic transmission.
  • Utilized an ATP hydrolysis-deficient ATAD1 mutant for rescue experiments.

Main Results:

  • ATAD1 localizes to mitochondria in neuronal dendrites and spines.
  • ATAD1 deficiency causes mitochondrial fragmentation, impaired dendritic development, and reduced synaptic function.
  • Synaptic deficits are linked to impaired ATP hydrolysis by ATAD1, not just mitochondrial morphology.
  • ATAD1 loss results in decreased ATP production, altered membrane potential, and increased oxidative stress.

Conclusions:

  • ATAD1 is essential for maintaining mitochondrial function and integrity in neurons.
  • ATAD1's ATP hydrolysis activity is crucial for synaptic function and neurodevelopment.
  • This study highlights ATAD1 as a key regulator of neuronal mitochondrial health and synaptic transmission.