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Related Concept Videos

Protein Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Protein Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
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...
Coagulation01:09

Coagulation

The coagulation phase is a critical part of the body's process to prevent blood loss following injury to blood vessels. It involves chemical reactions that form a clot to seal the injured area. The clotting process begins shortly after injury, within 15-20 seconds for severe damage and 1-2 minutes for minor injuries.
During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...
Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which forms a...
Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...

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Related Experiment Video

Updated: Jun 5, 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

Platelet membrane-mediated coagulation protease complex assembly.

S S Ahmad1, P N Walsh

  • 1The Sol Sherry Thrombosis Research Center, Departments of Medicine and Biochemistry, Temple University School of Medicine, Philadelphia, PA 19140, USA.

Trends in Cardiovascular Medicine
|January 20, 2011
PubMed
Summary
This summary is machine-generated.

Platelets offer surfaces for blood clotting factors to assemble, enabling normal hemostasis. Specific platelet receptors bind these factors, influencing coagulation and offering targets for antithrombotic drugs.

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Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets
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Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets

Published on: November 29, 2024

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
09:38

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

Published on: February 14, 2017

Related Experiment Videos

Last Updated: Jun 5, 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

Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets
05:49

Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets

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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
09:38

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

Published on: February 14, 2017

Area of Science:

  • Hematology
  • Biochemistry
  • Molecular Biology

Background:

  • Platelet membranes serve as procoagulant surfaces crucial for assembling coagulation protease complexes.
  • These complexes facilitate the proteolytic activation of coagulation proteins, ensuring normal hemostasis.
  • Platelets possess specific, high-affinity receptors for numerous coagulation factors (e.g., Factor XI, Factor X, prothrombin) and their activated forms.

Purpose of the Study:

  • To review platelet receptor-mediated interactions with coagulation proteins.
  • To discuss the role of these interactions in the assembly of intrinsic tenase and prothrombinase complexes.
  • To explore platelet receptor-mediated Factor X activation as a potential target for antithrombotic therapies.

Main Methods:

  • Review of recent laboratory studies and published literature.
  • Analysis of molecular mechanisms underlying coagulation complex assembly on platelet surfaces.
  • Investigation of specific protein receptors versus procoagulant phospholipids in defining the platelet procoagulant surface.

Main Results:

  • Platelets exhibit specific, saturable receptors for multiple coagulation factors and proteases.
  • The precise contribution of phospholipids versus protein receptors to the procoagulant surface is under investigation.
  • Platelet receptor-mediated Factor X activation is identified as a key pathway.

Conclusions:

  • Platelet receptors play a significant role in binding and organizing coagulation factors.
  • Understanding these receptor-mediated interactions is vital for elucidating hemostasis.
  • Targeting platelet receptor-mediated Factor X activation presents a promising strategy for developing novel antithrombotic agents.