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Context matters : The importance of dimerization-induced conformation of the LukGH leukocidin of Staphylococcus aureus for the generation of neutralizing antibodies

Badarau, Adriana ; Rouha, Harald ; Malafa, Stefan ; Battles, Michael B. ; Walker, Laura ; Nielson, Nels ; Dolezilkova, Ivana ; Teubenbacher, Astrid ; Banerjee, Srijib and Maierhofer, Barbara , et al. (2016) In mAbs 8(7). p.1347-1360
Abstract

LukGH (LukAB) is a potent leukocidin of Staphylococcus aureus that lyses human phagocytic cells and is thought to contribute to immune evasion. Unlike the other bi-component leukocidins of S. aureus, LukGH forms a heterodimer before binding to its receptor, CD11b expressed on professional phagocytic cells, and displays significant sequence variation. We employed a high diversity human IgG1 library presented on yeast cells to discover monoclonal antibodies (mAbs) neutralizing the cytolytic activity of LukGH. Recombinant LukG and LukH monomers or a LukGH dimer were used as capture antigens in the library selections. We found that mAbs identified with LukG or LukH as bait had no or very low toxin neutralization potency. In contrast, LukGH... (More)

LukGH (LukAB) is a potent leukocidin of Staphylococcus aureus that lyses human phagocytic cells and is thought to contribute to immune evasion. Unlike the other bi-component leukocidins of S. aureus, LukGH forms a heterodimer before binding to its receptor, CD11b expressed on professional phagocytic cells, and displays significant sequence variation. We employed a high diversity human IgG1 library presented on yeast cells to discover monoclonal antibodies (mAbs) neutralizing the cytolytic activity of LukGH. Recombinant LukG and LukH monomers or a LukGH dimer were used as capture antigens in the library selections. We found that mAbs identified with LukG or LukH as bait had no or very low toxin neutralization potency. In contrast, LukGH dimer-selected antibodies proved to be highly potent, and several mAbs were able to neutralize even the most divergent LukGH variants. Based on biolayer interferometry and mesoscale discovery, the high affinity antibody binding site on the LukGH complex was absent on the individual monomers, suggesting that it was generated upon formation of the LukG-LukH dimer. X-ray crystallography analysis of the complex between the LukGH dimer and the antigen-binding fragment of a very potent mAb (PDB code 5K59) indicated that the epitope is located in the predicted cell binding region (rim domain) of LukGH. The corresponding IgG inhibited the binding of LukGH dimer to target cells. Our data suggest that knowledge of the native conformation of target molecules is essential to generate high affinity and functional mAbs.

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publishing date
type
Contribution to journal
publication status
published
subject
keywords
Conformational epitope, LukGH, Staphylococcus aureus, toxin neutralization, X-ray crystal structure
in
mAbs
volume
8
issue
7
pages
14 pages
publisher
Taylor & Francis
external identifiers
  • pmid:27467113
  • scopus:84984871095
ISSN
1942-0862
DOI
10.1080/19420862.2016.1215791
language
English
LU publication?
no
additional info
Publisher Copyright: © 2016 The Author(s). Published with license by Taylor & Francis Group, LLC.
id
9494b6a1-89e7-4ed1-96b5-0d081d2224ac
date added to LUP
2022-04-25 11:20:11
date last changed
2024-03-21 07:32:18
@article{9494b6a1-89e7-4ed1-96b5-0d081d2224ac,
  abstract     = {{<p>LukGH (LukAB) is a potent leukocidin of Staphylococcus aureus that lyses human phagocytic cells and is thought to contribute to immune evasion. Unlike the other bi-component leukocidins of S. aureus, LukGH forms a heterodimer before binding to its receptor, CD11b expressed on professional phagocytic cells, and displays significant sequence variation. We employed a high diversity human IgG1 library presented on yeast cells to discover monoclonal antibodies (mAbs) neutralizing the cytolytic activity of LukGH. Recombinant LukG and LukH monomers or a LukGH dimer were used as capture antigens in the library selections. We found that mAbs identified with LukG or LukH as bait had no or very low toxin neutralization potency. In contrast, LukGH dimer-selected antibodies proved to be highly potent, and several mAbs were able to neutralize even the most divergent LukGH variants. Based on biolayer interferometry and mesoscale discovery, the high affinity antibody binding site on the LukGH complex was absent on the individual monomers, suggesting that it was generated upon formation of the LukG-LukH dimer. X-ray crystallography analysis of the complex between the LukGH dimer and the antigen-binding fragment of a very potent mAb (PDB code 5K59) indicated that the epitope is located in the predicted cell binding region (rim domain) of LukGH. The corresponding IgG inhibited the binding of LukGH dimer to target cells. Our data suggest that knowledge of the native conformation of target molecules is essential to generate high affinity and functional mAbs.</p>}},
  author       = {{Badarau, Adriana and Rouha, Harald and Malafa, Stefan and Battles, Michael B. and Walker, Laura and Nielson, Nels and Dolezilkova, Ivana and Teubenbacher, Astrid and Banerjee, Srijib and Maierhofer, Barbara and Weber, Susanne and Stulik, Lukas and Logan, Derek T. and Welin, Martin and Mirkina, Irina and Pleban, Clara and Zauner, Gerhild and Gross, Karin and Jägerhofer, Michaela and Magyarics, Zoltán and Nagy, Eszter}},
  issn         = {{1942-0862}},
  keywords     = {{Conformational epitope; LukGH; Staphylococcus aureus; toxin neutralization; X-ray crystal structure}},
  language     = {{eng}},
  month        = {{10}},
  number       = {{7}},
  pages        = {{1347--1360}},
  publisher    = {{Taylor & Francis}},
  series       = {{mAbs}},
  title        = {{Context matters : The importance of dimerization-induced conformation of the LukGH leukocidin of <i>Staphylococcus aureus </i>for the generation of neutralizing antibodies}},
  url          = {{http://dx.doi.org/10.1080/19420862.2016.1215791}},
  doi          = {{10.1080/19420862.2016.1215791}},
  volume       = {{8}},
  year         = {{2016}},
}