Site-Directed Mutagenesis to Assess the Binding Capacity
of Class S Protein of <i>Staphylococcus aureus</i> Leucotoxins to the Surface of Polymorphonuclear Cells

Moussa, L. Baba; Werner, S.; Coraiola, M.; Colin, D. A.; Keller, D.; Sanni, A.; Serra, M. Dalla; Monteil, H.; Prévost, G.

doi:https://doi.org/10.1155/JBB/2006/80101

BioMed Research International

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Research Article | Open Access

Volume 2006 | Article ID 080101 | https://doi.org/10.1155/JBB/2006/80101

Site-Directed Mutagenesis to Assess the Binding Capacity of Class S Protein of Staphylococcus aureus Leucotoxins to the Surface of Polymorphonuclear Cells

L. Baba Moussa,¹S. Werner,²M. Coraiola,³D. A. Colin,¹D. Keller,²A. Sanni,¹M. Dalla Serra,³H. Monteil,²and G. Prévost²

Received13 Aug 2005

Revised30 Nov 2005

Accepted04 Dec 2005

Published23 Feb 2006

Abstract

Staphylococcal leucotoxins result from the association of class S components and class F component inducing the activation and the permeabilization of the target cells. Like α-toxin, the leucotoxins are pore-forming toxins with more than 70% β-sheet. This was confirmed by attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. In addition, threonine 28 of a predicted and conserved β-sheet at the N-terminal extremity of class S proteins composing leucotoxins aligns with histidine 35 of α-toxin, which has a key role in oligomerization of the final pore. Flow cytometry was used to study different aminoacid substitutions of the threonine 28 in order to evaluate its role in the biological activity of these class S proteins. Finally, results show that threonine 28 of the leucotoxin probably plays a role similar to that of histidine 35 of α-toxin. Mutations on this threonin largely influenced the secondary interaction of the class F component and led to inactive toxin.

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Copyright © 2006 L. Baba Moussa et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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