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Related Concept Videos

GTPases and their Regulation02:14

GTPases and their Regulation

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Guanine nucleotide-binding proteins (G-proteins), also known as GTPases, are a superfamily of proteins that regulate many cellular processes, such as cell signaling, vesicular transport, and the regulation of cell shape and motility. Mutation or dysfunction of these proteins can lead to disease. There are around 40,000 known G-proteins that can broadly be classified into two groups ‒  small G-proteins consisting of a single domain and large multi-domain G-proteins.
Large G-proteins,...
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GTPases and their Regulation02:14

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Coat Assembly and GTPases01:33

Coat Assembly and GTPases

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Vesicles incorporate different coat protein subunits in different cell locations, which changes the properties of the coat, such as the shape and geometry of the transport vesicles. Thus, vesicle coat proteins also play a significant role in cargo selection.
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Small GTPases - Ras and Rho01:24

Small GTPases - Ras and Rho

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Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
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Structure and Function of Platelets01:18

Structure and Function of Platelets

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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...
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Formation of the Platelet Plug01:22

Formation of the Platelet Plug

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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...
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Related Experiment Video

Updated: Feb 3, 2026

Detection of Small GTPase Prenylation and GTP Binding Using Membrane Fractionation and GTPase-linked Immunosorbent Assay
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Detection of Small GTPase Prenylation and GTP Binding Using Membrane Fractionation and GTPase-linked Immunosorbent Assay

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Small GTPases in platelet membrane trafficking.

Tony G Walsh1, Yong Li1, Andreas Wersäll1

  • 1a From the School of Physiology, Pharmacology and Neuroscience, Biomedical Sciences Building , University of Bristol , Bristol , UK.

Platelets
|October 27, 2018
PubMed
Summary

Small GTPases regulate vesicle trafficking in platelets, crucial for hemostasis and other functions. Further research into these molecular switches could reveal new therapeutic targets for platelet disorders.

Keywords:
EndocytosisGTPaseexocytosisplateletstrafficking

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Area of Science:

  • Platelet biology
  • Molecular cell biology
  • Vesicle trafficking

Background:

  • Platelets play critical roles in hemostasis, thrombosis, regeneration, inflammation, and metastasis.
  • Vesicle trafficking, including cargo uptake, packaging, and release, is central to platelet function.
  • Small GTPases of the Ras superfamily act as molecular switches controlling cellular processes, including vesicle trafficking.

Purpose of the Study:

  • To review the current literature on the roles of Rab, Arf, and Ras subfamily GTPases in platelet vesicle trafficking.
  • To explore potential roles for other GTPases and regulatory proteins in platelet function.
  • To highlight the importance of small GTPases as potential therapeutic targets in platelet-related diseases.

Main Methods:

  • Literature review of small GTPase function in platelet biology.
  • Analysis of platelet proteomic datasets to identify expressed GTPases.
  • Discussion of current understanding and future directions in the field.

Main Results:

  • Over half of the 130+ members of the Rab, Arf, and Ras GTPase subfamilies are expressed in human platelets.
  • These GTPases are implicated in endocytic and exocytic events, as well as vesicle biogenesis.
  • The lack of specific molecular tools has limited research, but advances are anticipated.

Conclusions:

  • Small GTPases are key regulators of diverse platelet functions through vesicle trafficking.
  • Further investigation into small GTPase roles is essential for understanding platelet biology.
  • Targeting small GTPases offers potential for novel therapeutic strategies in platelet disorders.