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Related Concept Videos

Coagulation01:06

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
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...
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.
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Venous Thrombosis III: Interprofessional Care

Venous thrombosis requires effective prevention and treatment strategies to improve patient outcomes and reduce potential complications.Prevention StrategiesHealthcare providers must prioritize preventing venous thromboembolism (VTE) for all adult patients upon admission. Interventions depend on bleeding and thrombosis risk, medical history, current medications, diagnoses, planned procedures, and patient preferences. Patients on bed rest should change positions every two hours and, if not...

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Related Experiment Video

Updated: Jul 16, 2026

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay
13:08

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay

Published on: September 9, 2012

An extensive interaction interface between thrombin and factor V is required for factor V activation.

T Myles1, T H Yun, S W Hall

  • 1Division of Hematology, Stanford University School of Medicine, Stanford, CA 94305, USA. tmyles@stanford.edu

The Journal of Biological Chemistry
|April 20, 2001
PubMed
Summary

This study reveals that thrombin

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Last Updated: Jul 16, 2026

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay
13:08

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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:

  • Biochemistry
  • Molecular Biology
  • Hematology

Background:

  • Thrombin plays a crucial role in blood coagulation by activating factor V (FV).
  • Understanding the interaction interface between thrombin and FV is essential for elucidating the mechanisms of coagulation.
  • Site-directed mutagenesis is a powerful tool for dissecting protein-protein interactions.

Purpose of the Study:

  • To investigate the specific residues and regions of human thrombin involved in the interaction with human factor V (FV).
  • To determine the contribution of anion-binding exosite I (ABE-I), anion-binding exosite II (ABE-II), and other regions to FV activation.
  • To elucidate the structural requirements for efficient thrombin-mediated cleavage of FV.

Main Methods:

  • Site-directed mutagenesis was used to generate 78 recombinant thrombin mutants.
  • A two-stage clotting assay was employed to measure the FV activation activity of thrombin mutants.
  • SDS-polyacrylamide gel electrophoresis was used to analyze the cleavage of FV by selected thrombin mutants.

Main Results:

  • Seventeen thrombin mutants exhibited significantly reduced FV activation (<50% of wild-type).
  • Key regions identified include anion-binding exosite I, anion-binding exosite II, the Leu(45)-Asn(57) insertion loop, and the Na(+) binding loop.
  • Mutants in ABE-I (e.g., R68A, R70A, Y71A) and ABE-II (e.g., R98A) showed substantial defects in FV activation (<30% of WT activity).
  • Mutations in the Na(+) binding loop (E229A, R233A) and the Leu(45)-Asn(57) insertion loop (W50A) also significantly impaired FV activation.
  • Efficient cleavage of FV at Arg(709) requires both ABEs and the Na(+)-bound form of thrombin.
  • Basic residues in both ABEs contribute to complex formation through electrostatic interactions with FV.

Conclusions:

  • Thrombin activation of FV involves an extensive interaction interface, requiring both ABE-I and ABE-II.
  • The Na(+)-bound form of thrombin is critical for optimal procoagulant activity.
  • The S' subsite and specific loops also play important roles in the thrombin-FV interaction and efficient cleavage.
  • These findings provide detailed insights into the molecular basis of thrombin-mediated FV activation in hemostasis.