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Related Concept Videos

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...
Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
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...
Tissue Membranes01:27

Tissue Membranes

A tissue membrane is a thin layer of cells that covers the outside of the body, the organs, internal passageways that lead to the exterior of the body, and the lining of the moveable joint cavities. There are two basic types of tissue membranes— connective tissue and epithelial membranes.
Connective Tissue Membranes
The connective tissue membrane is formed solely from connective tissue. These membranes encapsulate organs, such as the kidneys, and line our movable joints. A synovial membrane is...
Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
What are Membranes?01:24

What are Membranes?

A cell's plasma membrane demarcates the cell's borders and determines the nature of its interaction with the environment. Cells exclude certain substances, take in others, and excrete some others in controlled quantities. The plasma membrane must be flexible to allow certain cells, such as red and white blood cells, to change their shape while passing through narrow capillaries. These are the more obvious plasma membrane functions. In addition, the plasma membrane's surface carries markers that...

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Related Experiment Video

Updated: May 24, 2026

Extracellular Vesicle Tissue Factor Activity Assay
03:53

Extracellular Vesicle Tissue Factor Activity Assay

Published on: December 29, 2023

Tissue factor/factor VIIa complex: role of the membrane surface.

James H Morrissey1, Emad Tajkhorshid, Stephen G Sligar

  • 1Department of Biochemistry, Chemistry, and Pharmacology, University of Illinois, Urbana, IL 61801, USA. jhmorris@illinois.edu

Thrombosis Research
|March 16, 2012
PubMed
Summary

Blood clotting involves factor VIIa binding tissue factor (TF). Understanding how clotting proteins interact with membranes via gamma-carboxyglutamate-rich (GLA) domains is crucial for their catalytic activity.

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Extracellular Vesicle Tissue Factor Activity Assay
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Published on: June 3, 2014

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • Blood clotting initiation involves the tissue factor (TF):factor VIIa (FVIIa) complex.
  • FVIIa, factor IX (FIX), and factor X (FX) bind membranes via gamma-carboxyglutamate-rich (GLA) domains.
  • Membrane interactions significantly impact the catalytic activity of clotting proteases, but mechanisms remain unclear.

Purpose of the Study:

  • To elucidate the mechanisms of GLA domain binding to phospholipid bilayers.
  • To investigate how specific phospholipids modulate the catalytic activity of the TF:FVIIa complex.

Main Methods:

  • Utilized nanoscale membrane bilayers (Nanodiscs).
  • Employed solid-state Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Performed all-atom molecular dynamics (MD) simulations.

Main Results:

  • Provided detailed insights into GLA domain-membrane interactions.
  • Identified specific phospholipids that enhance TF:FVIIa complex catalytic activity.
  • Linked membrane binding to protease function.

Conclusions:

  • Membrane composition plays a critical role in regulating blood coagulation.
  • Detailed understanding of TF:FVIIa-membrane interactions can inform therapeutic strategies.