VopA inhibits ATP binding by acetylating the catalytic loop of MAPK kinases

Jennifer E. Trosky, Yan Li, Sohini Mukherjee, Gladys Keitany, Haydn Ball, Kim Orth

Research output: Contribution to journalArticlepeer-review

90 Scopus citations


The bacterial pathogen Vibrio parahemeolyticus manipulates host signaling pathways during infections by injecting type III effectors. One of these effectors, Vibrio outer protein A (VopA), inhibits MAPK signaling via a novel mechanism, distinct from those described for other bacterial toxins, that disrupts this signaling pathway. VopA is an acetyltransferase that potently inhibits MAPK signaling pathways not only by preventing the activation of MAPK kinases (MKKs) but also by inhibiting the activity of activated MKKs. VopA acetylates a conserved lysine found in the catalytic loop of all kinases and blocks the binding of ATP, but not ADP, on the MKKs, resulting in an inactive phosphorylated kinase. Acetylation of this conserved lysine inhibits kinase activity by a new mechanism of regulation that has not been observed previously. Identifying the target of VopA reveals a way that the reversible post-translational modification of lysine acetylation can be used to regulate the activity of an enzyme.

Original languageEnglish (US)
Pages (from-to)34299-34305
Number of pages7
JournalJournal of Biological Chemistry
Issue number47
StatePublished - Nov 23 2007

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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