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Peptide Scanning-assisted Identification of a Monoclonal Antibody-recognized Linear B-cell Epitope
Published on: March 24, 2017
Molecular dissection of an hCG-beta epitope using single-step solid phase radioimmunoassay
Pramod V Prasad1, Shail K Chaube, Manoj Panchal
1Department of Reproductive Biomedicine, National Institute of Health and Family Welfare, Munirka, New Delhi-110067, India.
Clinica Chimica Acta; International Journal of Clinical Chemistry
|September 9, 2006
Summary
A novel single-step solid phase radioimmunoassay (SS-SPRIA) simplifies identifying conformation-specific epitopes. This method accurately maps the 93-100 amino acid loop in hCG-beta, crucial for receptor binding.
Area of Science:
- Immunology
- Biochemistry
- Protein Chemistry
Background:
- Proteins possess both sequence-specific and conformation-specific epitopes.
- Current methods for mapping conformation-specific epitopes are complex and resource-intensive.
Purpose of the Study:
- To develop a simplified method for identifying and mapping conformation-specific epitopes.
- To characterize the epitope-paratope interactions of human chorionic gonadotropin beta (hCG-beta).
Main Methods:
- Utilized a single-step solid phase radioimmunoassay (SS-SPRIA).
- Employed an immunochemical bridge with a specific monoclonal antibody (MAb G(1)G(10).1) and radiolabeled hCG-beta.
- Assessed competitive inhibition of binding with modified hCG-beta to map amino acids within the epitope.
Main Results:
- Identified a core epitope region comprising Arg (94, 95) and Asp (99).
- Located Lys (104) and His (106) in proximity to the core epitope.
- Confirmed the absence of chymotrypsin-susceptible Phe or Tyr in the epitope region.
Conclusions:
- The SS-SPRIA method successfully identified the 93-100 amino acid loop as the core of a conformation-specific epitope in hCG-beta.
- This epitope is located near the receptor-binding region.
- SS-SPRIA offers a simple and effective approach for epitope mapping.
