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Toxins 2017, 9(2), 50; doi:10.3390/toxins9020050

Human scFvs That Counteract Bioactivities of Staphylococcus aureus TSST-1

1
Graduate Program in Immunology, Department of Immunology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand
2
Center of Research Excellence on Therapeutic Proteins and Antibody Engineering, Department of Parasitology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand
3
Department of Research and Development, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand
4
Department of Microbiology, Faculty of Public Health, Mahidol University, Bangkok 10400, Thailand
5
Department of Microbiology and Immunology, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand
*
Author to whom correspondence should be addressed.
Academic Editor: Andreas Rummel
Received: 7 November 2016 / Accepted: 9 February 2017 / Published: 17 February 2017
(This article belongs to the Collection Staphylococcus aureus Toxins)
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Abstract

Some Staphylococcus aureus isolates produced toxic shock syndrome toxin-1 (TSST-1) which is a pyrogenic toxin superantigen (PTSAg). The toxin activates a large fraction of peripheral blood T lymphocytes causing the cells to proliferate and release massive amounts of pro-inflammatory cytokines leading to a life-threatening multisystem disorder: toxic shock syndrome (TSS). PTSAg-mediated-T cell stimulation circumvents the conventional antigenic peptide presentation to T cell receptor (TCR) by the antigen-presenting cell (APC). Instead, intact PTSAg binds directly to MHC-II molecule outside peptide binding cleft and simultaneously cross-links TCR-Vβ region. Currently, there is neither specific TSS treatment nor drug that directly inactivates TSST-1. In this study, human single chain antibodies (HuscFvs) that bound to and neutralized bioactivities of the TSST-1 were generated using phage display technology. Three E. coli clones transfected with TSST-1-bound phages fished-out from the human scFv library using recombinant TSST-1 as bait expressed TSST-1-bound-HuscFvs that inhibited the TSST-1-mediated T cell activation and pro-inflammatory cytokine gene expressions and productions.Computerized simulation, verified by mutations of the residues of HuscFv complementarity determining regions (CDRs),predicted to involve in target binding indicated that the HuscFvs formed interface contact with the toxin residues important for immunopathogenesis. The HuscFvs have high potential for future therapeutic application. View Full-Text
Keywords: direct acting anti-TSST-1; human scFv; Staphylococcus aureus; superantigen; Toxic shock syndrome (TSS) direct acting anti-TSST-1; human scFv; Staphylococcus aureus; superantigen; Toxic shock syndrome (TSS)
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Rukkawattanakul, T.; Sookrung, N.; Seesuay, W.; Onlamoon, N.; Diraphat, P.; Chaicumpa, W.; Indrawattana, N. Human scFvs That Counteract Bioactivities of Staphylococcus aureus TSST-1. Toxins 2017, 9, 50.

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