Barbieri J T, Rappuoli R, Collier R J
Infect Immun. 1987 May;55(5):1321-3. doi: 10.1128/iai.55.5.1321-1323.1987.
The S-1 subunit of pertussis toxin was expressed as a fusion protein in a strain of Escherichia coli deficient in protein degradation. The fusion protein reacted with anti-pertussis toxin antibody, and, like authentic pertussis toxin, it ADP-ribosylated a 41,000-molecular-weight membrane protein from human erythrocytes.