Related Experiment Videos
From esoteric theory to therapeutic antibodies
1Department of Biochemistry, Northwestern University, Evanston, IL 60208.
Applied Biochemistry and Biotechnology
|May 1, 1994
Summary
Antibody structure and function are understood through immunoglobulin sequence analysis. Complementarity determining regions (CDRs) form the antigen-binding site, and their 3-D structures can be predicted for antibody engineering.
Area of Science:
- Immunology
- Structural Biology
- Bioinformatics
Background:
- Immunoglobulins (antibodies) are crucial for adaptive immunity.
- Sequence analysis reveals antibody structure-function relationships.
- Complementarity Determining Regions (CDRs) dictate antigen binding specificity.
Purpose of the Study:
- To analyze immunoglobulin sequences for understanding antibody structure and function.
- To investigate the role of CDRs and Framework Regions (FRs) in antibody-antigen interactions.
- To explore methods for humanizing mouse antibodies using sequence similarities.
Main Methods:
- Theoretical analysis of amino acid and nucleotide sequences of immunoglobulins.
- Variability plots to identify CDRs.
- Prediction of 3-D CDR configurations based on amino acid sequences.
- Comparison of human and mouse FR sequences.
Main Results:
- Variability plots identified six CDRs forming the antibody-combining site.
- Framework region (FR) 3-D foldings are conserved across antibodies.
- CDRs form a compact surface for tight antigen fitting.
- The heavy chain CDRH3 plays a key role in antibody-antigen fine-tuning.
- Human and mouse FR sequences show evolutionary conservation.
Conclusions:
- Antibody 3-D structures, particularly CDRs, can be predicted from sequences.
- Conserved FR sequences between species can guide antibody humanization.
- Grafting mouse CDRs onto human FRs requires matching FR sequences for biological activity.