Microbiology Pertusis toxin acts by all of the following mechanisms except ? A ADP ribosylation of proteins associated with receptors B Increase cyclic AMP C Increased calcium release from sarcoplasmic reticulum D Acts through G alpha subunit 💡 Explanation Pertusis toxin acts by all of the following mechanisms except ? ✓ Correct Answer: C. Increased calcium release from sarcoplasmic reticulum