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Related Concept Videos

The Proteasome02:18

The Proteasome

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.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
The Proteasome01:13

The Proteasome

Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
Regulated Protein Degradation02:58

Regulated Protein Degradation

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.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Structure and Function of Platelets01:18

Structure and Function of Platelets

The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000 platelets, with...
Formation of the Platelet Plug01:22

Formation of the Platelet Plug

The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
The Proteasome Structure01:17

The Proteasome Structure

The ubiquitin-proteasome pathway is a well-known mechanism utilized by eukaryotic cells to remove cytoplasmic proteins that are misfolded, damaged, or no longer needed. In this pathway, the protein that needs to be eliminated undergoes a process called ubiquitination, where a chain of ubiquitin molecules is attached to the 48th lysine residue of the target protein. This ubiquitin modification helps the proteasome distinguish between a target protein and a healthy protein.
The proteasome is an...

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Related Experiment Video

Updated: May 7, 2026

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation
04:37

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation

Published on: May 23, 2025

Protein degradation systems in platelets.

B F Kraemer1, A S Weyrich, S Lindemann

  • 1Andrew Weyrich, MD, Eccles Institute of Human Genetics, Department of Internal Medicine, University of Utah, Salt Lake City, Building 533 Room 4220, Salt Lake City, Utah 84112, USA, Tel: +1 801 5850702, Fax: +1 801 5850701,

Thrombosis and Haemostasis
|September 20, 2013
PubMed
Summary
This summary is machine-generated.

Platelets synthesize proteins, but their protein degradation roles remain unclear. This review focuses on proteasome and calpain functions in these anucleate cells.

Keywords:
Plateletscalpainproteasomeprotein degradation

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Live-cell Imaging of Platelet Degranulation and Secretion Under Flow
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Area of Science:

  • Cellular biology
  • Molecular biology
  • Hematology

Background:

  • Protein synthesis and degradation are vital for cell survival and adaptation.
  • Nucleated cells utilize protein degradation to eliminate aberrant proteins and regulate signaling.
  • While platelet protein synthesis is established, their protein degradation mechanisms are less understood.

Purpose of the Study:

  • To review the known roles of protein degradation in platelets.
  • To highlight the involvement of the proteasome and calpain in platelet protein turnover.

Main Methods:

  • Literature review of studies on protein degradation in platelets.
  • Focus on proteasomal and calpain pathways.

Main Results:

  • Platelets possess mechanisms for protein degradation, though less characterized than in nucleated cells.
  • The proteasome and calpain are key proteases implicated in platelet protein turnover.

Conclusions:

  • Protein degradation plays a role in platelet function, despite their anucleate nature.
  • Further research is needed to fully elucidate the significance of proteasomal and calpain activity in platelets.