Disrupting a key hydrophobic pair in the oligomerization interface of the actinoporins impairs their pore‐forming activity. (23rd February 2017)

• Record Type: Journal Article
• Authors: Mesa‐Galloso, Haydeé; Delgado‐Magnero, Karelia H.; Cabezas, Sheila; López‐Castilla, Aracelys; Hernández‐González, Jorge E.; Pedrera, Lohans; Alvarez, Carlos; Peter Tieleman, D.; García‐Sáez, Ana J.; Lanio, Maria E.; Ros, Uris; Valiente, Pedro A.
• Is Part Of: Protein science. Volume 26:Number 3(2017)
• Page Start: 550
• Page End: 565
• Publication Date: 2017-02-23
• Subjects: pore‐forming toxins -- dimeric intermediate -- oligomerization in membranes -- molecular dynamic simulations -- protein–lipid pore; Proteins -- Periodicals; 572.6
• DOI: 10.1002/pro.3104
• Languages: English
• ISSNs: 0961-8368

Abstract

Abstract: Crystallographic data of the dimeric and octameric forms of fragaceatoxin C (FraC) suggested the key role of a small hydrophobic protein–protein interaction surface for actinoporins oligomerization and pore formation in membranes. However, site‐directed mutagenesis studies supporting this hypothesis for others actinoporins are still lacking. Here, we demonstrate that disrupting the key hydrophobic interaction between V60 and F163 (FraC numbering scheme) in the oligomerization interface of FraC, equinatoxin II (EqtII), and sticholysin II (StII) impairs the pore formation activity of these proteins. Our results allow for the extension of the importance of FraC protein–protein interactions in the stabilization of the oligomeric intermediates of StII and EqtII pointing out that all of these proteins follow a similar pathway of membrane disruption. These findings support the hybrid pore proposal as the universal model of actinoporins pore formation. Moreover, we reinforce the relevance of dimer formation, which appears to be a functional intermediate in the assembly pathway of some different pore‐forming proteins.