Inhibition of αIIbβ3 Ligand Binding by an αIIb Peptide that Clasps the Hybrid Domain to the βI Domain of β3
| Autor: | Elisabeth Schaffner-Reckinger, Dominique Baruch, Demokritos C. Tsoukatos, Wen Hwa Lee, Kelly Aylward, Vassilios Moussis, Vassilios Tsikaris, Nelly Kieffer, Paraskevi Trypou, Marion Egot, Christilla Bachelot-Loza |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Platelet Membrane Glycoprotein IIb
Platelet Aggregation Integrin Integrin alpha2 lcsh:Medicine Peptide Plasma protein binding Platelet Glycoprotein GPIIb-IIIa Complex Biochemistry biophysics & molecular biology [F05] [Life sciences] Humans Platelet activation Biochimie biophysique & biologie moléculaire [F05] [Sciences du vivant] lcsh:Science chemistry.chemical_classification Multidisciplinary biology Chemistry lcsh:R Fibrinogen binding Fibrinogen Platelet Activation Biochemistry Biophysics biology.protein lcsh:Q Research Article Protein Binding |
| Zdroj: | PLoS ONE, Vol 10, Iss 9, p e0134952 (2015) PLoS ONE PLoS ONE. San Franscisco, CA: Public Library of Science (2015). |
| ISSN: | 1932-6203 |
| Popis: | Agonist-stimulated platelet activation triggers conformational changes of integrin αIIbβ3, allowing fibrinogen binding and platelet aggregation. We have previously shown that an octapeptide, p1YMESRADR8, corresponding to amino acids 313–320 of the β-ribbon extending from the β-propeller domain of αIIb, acts as a potent inhibitor of platelet aggregation. Here we have performed in silico modelling analysis of the interaction of this peptide with αIIbβ3 in its bent and closed (not swing-out) conformation and show that the peptide is able to act as a substitute for the β-ribbon by forming a clasp restraining the β3 hybrid and βI domains in a closed conformation. The involvement of species-specific residues of the β3 hybrid domain (E356 and K384) and the β1 domain (E297) as well as an intrapeptide bond (pE315-pR317) were confirmed as important for this interaction by mutagenesis studies of αIIbβ3 expressed in CHO cells and native or substituted peptide inhibitory studies on platelet functions. Furthermore, NMR data corroborate the above results. Our findings provide insight into the important functional role of the αIIb β-ribbon in preventing integrin αIIbβ3 head piece opening, and highlight a potential new therapeutic approach to prevent integrin ligand binding. |
| Databáze: | OpenAIRE |
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