Gi/o protein-dependent and -independent actions of pertussis toxin (ptx)

Supachoke Mangmool, Hitoshi Kurose

Research output: Contribution to journalArticlepeer-review

138 Citations (Scopus)


Pertussis toxin (PTX) is a typical A-B toxin. The A-protomer (S1 subunit) exhibits ADP-ribosyltransferase activity. The B-oligomer consists of four subunits (S2 to S5) and binds extracellular molecules that allow the toxin to enter the cells. The A-protomer ADP-ribosylates the α subunits of heterotrimeric Gi/o proteins, resulting in the receptors being uncoupled from the Gi/o proteins. The B-oligomer binds proteins expressed on the cell surface, such as Toll-like receptor 4, and activates an intracellular signal transduction cascade. Thus, PTX modifies cellular responses by at least two different signaling pathways; ADP-ribosylation of the Gαi/o proteins by the A-protomer (Gi/o protein-dependent action) and the interaction of the B-oligomer with cell surface proteins (Gi/o protein-independent action).

Original languageEnglish
Pages (from-to)884-899
Number of pages16
Issue number7
Publication statusPublished - Jul 2011

All Science Journal Classification (ASJC) codes

  • Toxicology
  • Health, Toxicology and Mutagenesis


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