Fibrinopeptide A binds Gly-Pro-Arg-Pro.
Root-Bernstein. R S RS; Westall. F C FC
Key Findings
- The tetrapeptide GlyāProāArgāPro binds to fibrinopeptide A.
- The binding constant is about 10ā“āÆMā»Ā¹, indicating moderate affinity.
- Nineteen related peptide controls were tested to confirm specificity.
Practical Outcomes
- For now, thereās no direct way to use this peptide for longevity or performance. Itās a basic science step that could eventually guide antiāclot or antiāinflammation strategies, but more research is needed before any realāworld protocol can be recommended.
Summary
Researchers found that a tiny fourāaminoāacid peptide (GlyāProāArgāPro) sticks to a part of fibrinogen called fibrinopeptide A, with a moderate binding strength. This helps map where the peptide might block fibrin formation, but the study didnāt test any health effects or dosing.
Abstract
The tetrapeptide Gly-Pro-Arg-Pro inhibits fibrinogen aggregation, probably by binding to the same sites used during initiation of fibrin formation. The Gly-Pro-Arg-Pro binding sites have not yet been identified. However, their possible sequence and locations have been predicted on the basis of the amino acid pairing hypothesis. One of these predicted sites is on fibrinopeptide A. We report here that nuclear magnetic resonance studies indicate that Gly-Pro-Arg-Pro binds to fibrinopeptide A with a binding constant, K, of ca. 10(4) per mol. We also report results of 19 related peptide combinations used as controls.
Study Information
pubmed
1984
10.1073/pnas.81.14.4339