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Both El Tor and classical cholera toxin bind blood group determinants
Julie E Heggelund1, Espen Haugen, Birgitte Lygren
1Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, NO-0315 Oslo, Norway.
Cholera toxin B-pentamers bind to blood group determinants, explaining why blood group O individuals have severe cholera. Binding affinity is similar for blood group O and A, but kinetics differ.
Area of Science:
- Microbiology
- Immunology
- Biochemistry
Background:
- Cholera severity varies by blood group, with individuals of blood group O experiencing the most severe symptoms.
- The cholera toxin has long been implicated as the cause of this blood group-dependent variation.
Purpose of the Study:
- To investigate the molecular basis of cholera's blood group dependence.
- To determine if cholera toxin B-pentamers bind to blood group determinants and if affinity differs between blood groups.
Main Methods:
- Surface Plasmon Resonance (SPR) was used to measure binding affinities.
- Nuclear Magnetic Resonance (NMR) spectroscopy was employed to analyze molecular interactions.
Main Results:
- Both El Tor and classical cholera toxin B-pentamers bind to blood group determinants with equal affinities.
- The blood group H-determinant, characteristic of blood group O, exhibits similar binding affinity to the A-determinant.
- Distinct binding kinetics were observed between the H-determinant and A-determinant.
Conclusions:
- The study confirms the hypothesis that cholera toxin B-pentamers binding to blood group determinants underlies cholera's blood group dependence.
- While binding affinities are similar, differences in binding kinetics may contribute to the varying severity of cholera observed in different blood groups.
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