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Related Concept Videos

Protein Import into the Peroxisomes01:27

Protein Import into the Peroxisomes

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Cells contain membrane-bound organelles called peroxisomes that oxidize organic molecules by transferring hydrogen atoms to oxygen, producing hydrogen peroxide. Peroxisomes enzymatically convert the released hydrogen peroxide into water and oxygen.
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...
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After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
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Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
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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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Peroxisomes01:24

Peroxisomes

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Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
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The Unfolded Protein Response01:37

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The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
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2,2'-dipyridyl induces pexophagy.

AiLin Jin1, Joon No Lee1, Min Soo Kim1

  • 1Center for Metabolic Function Regulation and Department of Microbiology, Wonkwang University, Iksan, Jeonbuk 54538, Republic of Korea.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Pexophagy is crucial for peroxisome quality control and cellular homeostasis.
  • Dysfunctional peroxisome dynamics are linked to various diseases.
  • Identifying novel pexophagy modulators is essential for therapeutic strategies.

Purpose of the Study:

  • To discover new molecules that regulate pexophagy.
  • To investigate the mechanism of 2,2 -dipyridyl (2,2-DP)-induced pexophagy.

Main Methods:

  • Development of a cell-based screening system.
  • Treatment with 2,2 -dipyridyl and assessment of peroxisome degradation markers.
  • Analysis of autophagy induction and inhibition.
  • Investigation of the role of metal chelation.

Main Results:

  • 2,2 -DP treatment significantly induced peroxisome degradation.
  • Observed increased autolysosomes and decreased peroxisomal protein expression.
  • Confirmed 2,2 -DP-induced pexophagy via autophagy pathway.
  • Demonstrated that iron chelation, not copper chelation, mediates the effect.
  • Showed that iron replenishment inhibits 2,2 -DP-mediated pexophagy.

Conclusions:

  • 2,2 -DP is a novel pexophagy modulator.
  • The mechanism involves iron depletion and disruption of peroxisome dynamics.
  • This finding offers potential therapeutic targets for peroxisome-related disorders.