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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Pasteurella multocida toxin facilitates inositol phosphate formation by bombesin through tyrosine phosphorylation of G alpha q.

The intracellularly acting Pasteurella multocida toxin (PMT) is a potent mitogen that stimulates Gq-dependent formation of inositol trisphosphate. We show that PMT, a nontoxic mutant of PMT (PMTC1165S), and bombesin each stimulate time-dependent phosphorylation of G alpha q at tyrosine 349. Although PMT and PMTC1165S each cause phosphorylation of G alpha q, only the wild-type toxin activates Gq. Pretreatment of cells with wild-type or mutant PMT potentiated the formation of inositol phosphates stimulated by bombesin equally. These data show that PMT potentiates bombesin receptor signaling through tyrosine phosphorylation of Gq and distinguishes between the two proposed models of Gq activation, showing that tyrosine phosphorylation is not linked to receptor uncoupling.[1]

References

  1. Pasteurella multocida toxin facilitates inositol phosphate formation by bombesin through tyrosine phosphorylation of G alpha q. Baldwin, M.R., Pullinger, G.D., Lax, A.J. J. Biol. Chem. (2003) [Pubmed]
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