Structural basis for PI(4)P-specific membrane recruitment of the legionella pneumophila effector DrrA/SidM

Claudia M. Del Campo, Ashwini K. Mishra, Yu Hsiu Wang, Craig R. Roy, Paul A. Janmey, David G. Lambright

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

Recruitment of the Legionella pneumophila effector DrrA to the Legionella-containing vacuole, where it activates and AMPylates Rab1, is mediated by a P4M domain that binds phosphatidylinositol 4-phosphate [PI(4)P] with high affinity and specificity. Despite the importance of PI(4)P in Golgi trafficking and its manipulation by pathogens, the structural bases for PI(4)P-dependent membrane recruitment remain poorly defined. Here, we determined the crystal structure of a DrrA fragment including the P4M domain in complex with dibutyl PI(4)P and investigated the determinants of phosphoinositide recognition and membrane targeting. Headgroup recognition involves an elaborate network of direct and water-mediated interactions with basic and polar residues in the context of a deep, constrictive binding pocket. An adjacent hydrophobic helical element packs against the acyl chains and inserts robustly into PI(4)P-containing monolayers. The structural, biochemical, and biophysical data reported here support a detailed structural mechanism for PI(4)P-dependent membrane targeting by DrrA.

Original languageEnglish (US)
Pages (from-to)397-408
Number of pages12
JournalStructure
Volume22
Issue number3
DOIs
StatePublished - Mar 4 2014
Externally publishedYes

ASJC Scopus subject areas

  • Structural Biology
  • Molecular Biology

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