The Pseudomonas exotoxin (or exotoxin A) is an exotoxin produced by Pseudomonas aeruginosa.

[1] Vibrio cholerae produces a similar protein called the Cholix toxin (Q5EK40).

This then causes the elongation of polypeptides to cease.

This mechanism is similar to that of diphtheria toxin.

[3] It has been investigated as a treatment for hepatitis B[4] and cancer.