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Related Concept Videos

Lysosomal Hydrolases01:22

Lysosomal Hydrolases

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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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Lysosomes01:31

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Lysosomes are membrane-enclosed spherical sacs derived from the Golgi apparatus. The most important function of the lysosome is degrading macromolecules and biological polymers that are released during membrane trafficking events such as the secretory, endocytic, autophagic, and phagocytic pathways. The degradation is carried out by several hydrolytic enzymes active in an acidic environment of the lysosomal lumen. These acid hydrolases are involved in cellular processes such as cell signaling,...
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The Proteasome02:18

The Proteasome

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Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
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Regulated Protein Degradation02:58

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It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
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Export of Misfolded Proteins out of the ER01:32

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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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Enzyme Inhibition

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Inhibitors are molecules that reduce enzyme activity by binding to the enzyme. In a normally functioning cell, enzymes are regulated by a variety of inhibitors. Drugs and other toxins can also inhibit enzymes. Some inhibitors bind to the enzyme’s active site, while others inhibit enzymatic activity by binding to other sites on the protein structure.
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Lysosomal Proteases and Their Inhibitors.

Vito Turk1,2, Veronika Stoka1,2

  • 1Department of Biochemistry and Molecular and Structural Biology, Jožef Stefan Institute, 1000 Ljubljana, Slovenia.

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Summary

The discovery of the lysosome, a key cellular component, revolutionized our understanding of intracellular protein breakdown. This organelle is crucial for degrading proteins within the cell.

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Area of Science:

  • Cell Biology
  • Biochemistry

Background:

  • The lysosome, a vital cytoplasmic organelle, was discovered, marking a significant advancement in cell biology.
  • Intracellular protein degradation, a fundamental cellular process, is primarily mediated by the lysosome.

Discussion:

  • The discovery elucidated the mechanisms of proteolysis within eukaryotic cells.
  • Lysosomal function is integral to maintaining cellular homeostasis and removing damaged proteins.

Key Insights:

  • Lysosomes are central to intracellular digestion and protein turnover.
  • This breakthrough provided a framework for studying lysosomal storage diseases and related pathologies.

Outlook:

  • Further research into lysosomal pathways can uncover new therapeutic targets.
  • Understanding lysosome function is critical for advancing treatments for various diseases.