Detailed Explanation
Small peptides (fibrinopeptide A: 16 aa, fibrinopeptide B: 14 aa) cleaved from fibrinogen by the enzyme thrombin during the blood coagulation cascade. Their removal exposes polymerization sites on fibrin monomers, triggering the self-assembly of the fibrin clot mesh.
Fibrinopeptide A is released first and is used clinically as a sensitive marker of active thrombin generation and coagulation activation. Evolutionarily, fibrinopeptides are among the fastest-evolving peptide sequences in mammals, making them useful molecular clocks in phylogenetic studies — they evolve approximately 10× faster than cytochrome c.
Key Facts
- Small peptides (fibrinopeptide A: 16 aa, fibrinopeptide B: 14 aa) cleaved from fibrinogen by the enzyme thrombin during the blood coagulation cascade.
- Their removal exposes polymerization sites on fibrin monomers, triggering the self-assembly of the fibrin clot mesh.
- Fibrinopeptide A is released first and is used clinically as a sensitive marker of active thrombin generation and coagulation activation.
- Evolutionarily, fibrinopeptides are among the fastest-evolving peptide sequences in mammals, making them useful molecular clocks in phylogenetic studies — they evolve approximately 10× faster than cytochrome c.
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