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Electron microscopy of the combination of antibodies with flagellar antigen and with a pyocine
Abstract:
Micrographs are presented of antibodies in combination with flagella of Salmonella typhi and with a phage-bound pyocine Rmc, which is supposed to be the tail of a defective bacteriophage from Pseudomonas aeruginosa. The pyocine preparation seems to offer advantages for the study of antibody-antigen complexes. Under the conditions of our experiments, the surfaces of the antigenic structures are saturated with antibody layers approximately 95 A in thickness, i.e., slightly less than half the accepted lengths of 7S antibody molecules. Our interpretation is that the antibody is attached by combining sites at the ends of the molecules to form loops along the surface of the antigenic structures.
Insights
Antibodies bind to Salmonella typhi flagella and Pseudomonas aeruginosa pyocine, forming antibody-antigen complexes. Antibodies attach via combining sites, creating loops on antigen surfaces approximately 95 A thick.
Area of Science:
- Immunology
- Microbiology
- Structural Biology
Background:
- Antibody-antigen interactions are crucial in immune responses.
- Studying these complexes requires advanced imaging techniques.
- Salmonella typhi and Pseudomonas aeruginosa are significant pathogens.
Purpose of the Study:
- To visualize and characterize antibody binding to bacterial antigens.
- To investigate the structure of antibody-antigen complexes using pyocine Rmc.
- To determine the orientation and thickness of antibody layers on antigen surfaces.
Main Methods:
- Electron microscopy of antibody-antigen complexes.
- Utilizing flagella of Salmonella typhi as antigens.
- Employing phage-bound pyocine Rmc from Pseudomonas aeruginosa.
Main Results:
- Micrographs show antibodies interacting with Salmonella typhi flagella and Pseudomonas aeruginosa pyocine.
- Pyocine Rmc preparation facilitates antibody-antigen complex study.
- Antibody layers on antigen surfaces measured approximately 95 A in thickness.
Conclusions:
- Antibodies attach to antigens via combining sites at their ends.
- This attachment forms loop-like structures on the antigen surface.
- The findings provide insights into antibody orientation and antigen-antibody complex structure.