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. 1985 Feb;82(3):869–873. doi: 10.1073/pnas.82.3.869

Association of the N-formyl-Met-Leu-Phe receptor in human neutrophils with a GTP-binding protein sensitive to pertussis toxin.

P M Lad, C V Olson, P A Smiley
PMCID: PMC397148  PMID: 2983319

Abstract

Pertussis toxin inhibits the N-formyl-Met-Leu-Phe (fMet-Leu-Phe) mediated human neutrophil functions of enzyme release, superoxide generation, aggregation, and chemotaxis. As pertussis toxin modifies the GTP binding receptor-regulatory protein "Ni," the association of the fMet-Leu-Phe receptor with such a protein was further examined in purified neutrophil plasma membranes. Both fMet-Leu-Phe-mediated guanine nucleotide exchange and nucleotide-mediated regulation of the fMet-Leu-Phe receptor are inhibited by pertussis toxin. In addition, membrane pretreatment with pertussis toxin abolishes the fMet-Leu-Phe-mediated inhibition of adenylate cyclase. Actions of pertussis toxin are due to the ADP-ribosylation of a single subunit at 41 kDa in the neutrophil plasma membrane, which comigrates on NaDodSO4 gels with the Ni GTP-binding protein in the platelet plasma membrane. Our results suggest that (i) the fMet-Leu-Phe receptor is associated with a Ni GTP regulatory protein, and (ii) a fMet-Leu-Phe-Ni complex is important in the control of several neutrophil functions, probably involving multiple transduction systems, including adenylate cyclase.

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Selected References

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