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Biological Macromolecular Resource

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Molecule of the Month

Ricin

Ricin is one of the most deadly toxins that has been discovered. A single molecule can kill an entire cell. It's also a very common toxin. It's made by the castor bean plant, which can be found in gardens and wild areas around the world and is widely grown for the oil it produces. The seeds are laced with the toxin: about 8 beans can provide a lethal dose. The structure of ricin reveals how it kills cells, and provides insight into how to create a vaccine to protect against ricin poisoning.

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Protein Structure Initiative Featured System

Tuning Immune Response with Costimulation

The job of the immune system is tricky, requiring a careful balance. The immune system must seek out and destroy viruses, bacteria and cancer cells using an army of aggressive cells and molecules. But at the same time, this response must be held in check, to ensure that the immune system does not attack our healthy cells and cause autoimmune diseases. PSI researchers are studying molecules that stimulate and inhibit our immune response, ensuring that it is activated only when necessary.

Full Article | Archive | PSI Structural Biology Knowledgebase

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Biological Macromolecular Resource

Ricin

Tuning Immune Response with Costimulation