Research Repository

GPVI and GPIba Mediate Staphylococcal Superantigen-Like Protein 5 (SSL5) Induced Platelet Activation and Direct toward Glycans as Potential Inhibitors

Hu, Houyuan and Armstrong, Paul C. J and Khalil, Elie and Chen, Yung-Chih and Straub, Andreas and Li, Min and Soosairajah, Juliana and Hagemeyer, Christoph E and Bassler, Nicole and Huang, Dexing and Ahrens, Ingo and Krippner, Guy and Gardiner, Elizabeth and Peter, Karlheinz (2011) GPVI and GPIba Mediate Staphylococcal Superantigen-Like Protein 5 (SSL5) Induced Platelet Activation and Direct toward Glycans as Potential Inhibitors. PLoS ONE, 6 (4). ISSN 1932-6203

[img] Text
asset.pdf - Published Version

Download (707kB)

Abstract

Background Staphylococcus aureus (S. aureus) is a common pathogen capable of causing life-threatening infections. Staphylococcal superantigen-like protein 5 (SSL5) has recently been shown to bind to platelet glycoproteins and induce platelet activation. This study investigates further the interaction between SSL5 and platelet glycoproteins. Moreover, using a glycan discovery approach, we aim to identify potential glycans to therapeutically target this interaction and prevent SSL5-induced effects. Methodology/Principal Findings In addition to platelet activation experiments, flow cytometry, immunoprecipitation, surface plasmon resonance and a glycan binding array, were used to identify specific SSL5 binding regions and mediators. We independently confirm SSL5 to interact with platelets via GPIbα and identify the sulphated-tyrosine residues as an important region for SSL5 binding. We also identify the novel direct interaction between SSL5 and the platelet collagen receptor GPVI. Together, these receptors offer one mechanistic explanation for the unique functional influences SSL5 exerts on platelets. A role for specific families of platelet glycans in mediating SSL5-platelet interactions was also discovered and used to identify and demonstrate effectiveness of potential glycan based inhibitors in vitro. Conclusions/Significance These findings further elucidate the functional interactions between SSL5 and platelets, including the novel finding of a role for the GPVI receptor. We demonstrate efficacy of possible glycan-based approaches to inhibit the SSL5-induced platelet activation. Our data warrant further work to prove SSL5-platelet effects in vivo

Item Type: Article
Uncontrolled Keywords: staphylococcus aureus, platelet glycoproteins, platelet activation, SSL5
Subjects: FOR Classification > 0304 Medicinal and Bimolecular Chemistry
Faculty/School/Research Centre/Department > College of Health and Biomedicine
Depositing User: VUIR
Date Deposited: 04 Dec 2013 00:19
Last Modified: 31 Aug 2016 06:49
URI: http://vuir.vu.edu.au/id/eprint/22447
DOI: 10.1371/journal.pone.0019190
ePrint Statistics: View download statistics for this item
Citations in Scopus: 8 - View on Scopus

Repository staff only

View Item View Item

Search Google Scholar