Epitope mapping of monoclonal antibodies against N-domain of carcinoembryonic antigen
Related Experiment Video
Updated: Aug 19, 2026
Colorectal Cancer Cell Surface Protein Profiling Using an Antibody Microarray and Fluorescence Multiplexing
Published on: September 25, 2011
Abstract:
Monoclonal antibodies (MoAbs) against N-domain of carcinoembryonic antigen (CEA), C249, K348, K1338, and K1444, that inhibit CEA-mediated cell adhesion, did not crossreact with nonspecific cross-reacting antigen (NCA). To determine amino acid sequences involved in the adhesion, epitopes of the MoAbs were mapped with recombinant NCAs carrying CEA-NCA chimeric N-domain. The data showed that the epitopes of C249, K1338, K1444 are located within the regions 1-32, 1-32, and 33-59 of CEA, respectively, and that two discrete regions 1-32 and 60-93 may be related to the epitope of K348. Comparison of amino acid sequences between CEA and NCA suggested that four residues (21, 27-29), eight residues (21, 27-29, 66, 78, 79, 89), and three residues (43, 44, 46) are important for recognition by C249 (or K1338), K348, and K1444, respectively. These residues seem to participate in the cell adhesion mediated by CEA.
Insights
Monoclonal antibodies targeting the N-domain of carcinoembryonic antigen (CEA) were used to identify key amino acid residues. These residues are crucial for CEA-mediated cell adhesion, providing insights into molecular interactions.
Area of Science:
- Biochemistry
- Immunology
- Molecular Biology
Background:
- Carcinoembryonic antigen (CEA) plays a role in cell adhesion.
- Monoclonal antibodies (MoAbs) against CEA can inhibit this adhesion.
- Understanding the specific molecular interactions is vital for therapeutic development.
Purpose of the Study:
- To map the epitopes of MoAbs that inhibit CEA-mediated cell adhesion.
- To identify specific amino acid sequences within the CEA N-domain responsible for cell adhesion.
- To elucidate the molecular basis of CEA-mediated cell adhesion.
Main Methods:
- Epitope mapping using recombinant CEA-NCA chimeric N-domain.
- Analysis of monoclonal antibody binding sites.
- Comparison of amino acid sequences between CEA and NCA.
Main Results:
- Epitopes for MoAbs C249, K1338, and K1444 were localized to specific regions (1-32, 1-32, and 33-59) of the CEA N-domain.
- Two regions (1-32 and 60-93) were implicated in the epitope for MoAb K348.
- Specific amino acid residues were identified as critical for MoAb recognition and CEA-mediated cell adhesion.
Conclusions:
- Specific amino acid residues within the CEA N-domain are critical for CEA-mediated cell adhesion.
- The identified residues are important targets for antibodies inhibiting CEA function.
- This research provides a molecular understanding of CEA's role in cell adhesion.
