How a Toxin from Vibrio cholerae Forms Pores in Cell Membranes
Author Information
Author(s): Mazumdar Budhaditya, Ganguly Sreerupa, Banerjee Kalyan K.
Primary Institution: National Institute of Cholera & Enteric Diseases (ICMR), Kolkata, India
Hypothesis
How does the C-terminus carbohydrate-binding domain of Vibrio cholerae haemolysin/cytolysin contribute to pore formation in erythrocytes?
Conclusion
The C-terminus domain is critical for the translocation of the pre-pore oligomeric assembly to the membrane, facilitating the formation of functional diffusion channels.
Supporting Evidence
- Proteolytic truncation of the C-terminus β-prism lectin domain decreased hemolytic activity by ~800-fold.
- The lectin domain augmented pore-forming activity to erythrocytes by three orders of magnitude.
- VCC and its truncated variant formed heptamers in contact with liposomes.
Takeaway
This study shows that a part of a toxin from Vibrio cholerae helps it create holes in cell membranes, which is important for its harmful effects.
Methodology
VCC was isolated from bacterial culture, purified, and its pore-forming activity was assessed using liposome assays and electron microscopy.
Limitations
The precise molecular mechanism of how the lectin domain promotes translocation remains unclear.
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