Related Experiment Video
Updated: Aug 6, 2026
08:09
Peptide Scanning-assisted Identification of a Monoclonal Antibody-recognized Linear B-cell Epitope
Published on: March 24, 2017
Identification of protein C epitopes altered during its nanoencapsulation
D Chognot1, M F Zambaux, F Bonneaux
1Laboratoire d'Hématologie-Physiologie, Faculté de Pharmacie, Nancy, France.
Journal of Protein Chemistry
|February 26, 2000
Summary
Encapsulating protein C in nanoparticles may improve treatment for coagulation disorders. Ultrasonication and methylene chloride treatments did not aggregate or cleave protein C, but likely altered specific amino acids, impacting its anticoagulant function.
Area of Science:
- Biochemistry
- Biotechnology
- Hematology
Background:
- Protein C regulates blood coagulation and its bioavailability is crucial for treating deficiency disorders.
- Biodegradable nanoparticles offer a potential method for improving protein C delivery.
- Current nanoparticle preparation methods involve ultrasonication and organic solvents, potentially affecting protein integrity.
Purpose of the Study:
- To assess the impact of ultrasonication and methylene chloride on protein C structure and function.
- To identify specific protein C epitopes affected by nanoparticle preparation methods.
- To correlate structural changes with functional alterations in protein C's anticoagulant activity.
Main Methods:
- Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) to evaluate protein C aggregation and cleavage.
- Enzyme-linked immunosorbent assay (ELISA) using monoclonal antibodies to map epitope accessibility.
- Functional assay measuring activated partial thromboplastin time (aPTT) to assess anticoagulant activity.
Main Results:
- SDS-PAGE confirmed that ultrasonication and methylene chloride did not cause protein C aggregation or cleavage.
- ELISA revealed alterations in the binding of specific monoclonal antibodies, indicating epitope modification.
- Functional assays showed a correlation between these structural changes and reduced anticoagulant activity.
Conclusions:
- Ultrasonication and methylene chloride treatment likely alter protein C by affecting amino acids 166-169 in the activation peptide.
- These residues may become internalized within the protein core, reducing surface exposure.
- Further research is needed to optimize nanoparticle formulation for preserving protein C's full functional integrity.
