Identification and structural analysis of the tripartite α-pore forming toxin of Aeromonas hydrophila

Jason S. Wilson, Alicia M. Churchill-Angus, Simon P. Davies, Svetlana E. Sedelnikova, Svetomir B. Tzokov, John B. Rafferty, Per A. Bullough, Claudine Bisson and Patrick J. Baker ()
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Jason S. Wilson: University of Sheffield, Firth Court, Western Bank
Alicia M. Churchill-Angus: University of Sheffield, Firth Court, Western Bank
Simon P. Davies: University of Sheffield, Firth Court, Western Bank
Svetlana E. Sedelnikova: University of Sheffield, Firth Court, Western Bank
Svetomir B. Tzokov: University of Sheffield, Firth Court, Western Bank
John B. Rafferty: University of Sheffield, Firth Court, Western Bank
Per A. Bullough: University of Sheffield, Firth Court, Western Bank
Claudine Bisson: University of Sheffield, Firth Court, Western Bank
Patrick J. Baker: University of Sheffield, Firth Court, Western Bank

Nature Communications, 2019, vol. 10, issue 1, 1-17

Abstract: Abstract The alpha helical CytolysinA family of pore forming toxins (α-PFT) contains single, two, and three component members. Structures of the single component Eschericia coli ClyA and the two component Yersinia enterolytica YaxAB show both undergo conformational changes from soluble to pore forms, and oligomerization to produce the active pore. Here we identify tripartite α-PFTs in pathogenic Gram negative bacteria, including Aeromonas hydrophila (AhlABC). We show that the AhlABC toxin requires all three components for maximal cell lysis. We present structures of pore components which describe a bi-fold hinge mechanism for soluble to pore transition in AhlB and a contrasting tetrameric assembly employed by soluble AhlC to hide their hydrophobic membrane associated residues. We propose a model of pore assembly where the AhlC tetramer dissociates, binds a single membrane leaflet, recruits AhlB promoting soluble to pore transition, prior to AhlA binding to form the active hydrophilic lined pore.

Date: 2019
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DOI: 10.1038/s41467-019-10777-x

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