Antibody WN1 222-5 mimics Toll-like receptor 4 binding in the recognition of LPS.Gomery, K., Muller-Loennies, S., Brooks, C.L., Brade, L., Kosma, P., Di Padova, F., Brade, H., Evans, S.V.
(2012) Proc Natl Acad Sci U S A 109: 20877-20882
- PubMed: 23184990
- DOI: https://doi.org/10.1073/pnas.1209253109
- Primary Citation of Related Structures:
- PubMed Abstract:
Escherichia coli infections, a leading cause of septic shock, remain a major threat to human health because of the fatal action to endotoxin (LPS). Therapeutic attempts to neutralize endotoxin currently focus on inhibiting the interaction of the toxic component lipid A with myeloid differentiating factor 2, which forms a trimeric complex together with Toll-like receptor 4 to induce immune cell activation. The 1.73-Å resolution structure of the unique endotoxin-neutralizing protective antibody WN1 222-5 in complex with the core region shows that it recognizes LPS of all E. coli serovars in a manner similar to Toll-like receptor 4, revealing that protection can be achieved by targeting the inner core of LPS and that recognition of lipid A is not required. Such interference with Toll-like receptor complex formation opens new paths for antibody sepsis therapy independent of lipid A antagonists.
Department of Biochemistry and Microbiology, University of Victoria, Victoria, BC, Canada V8P 3P6.