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DOI: 10.1055/s-0040-1721319
Heparin Inhibits Cellular Invasion by SARS-CoV-2: Structural Dependence of the Interaction of the Spike S1 Receptor-Binding Domain with Heparin
Funding This study was funded by the Biotechnology and Biological Sciences Research Council, UK (BB/L023717/1; BIV-HVB-2020/07/SKIDMORE; BB/S009787/1) and the Fundação de Amparo à Pesquisa do Estado de São Paulo, Brazil (2020/04899-1).Abstract
The dependence of development and homeostasis in animals on the interaction of hundreds of extracellular regulatory proteins with the peri- and extracellular glycosaminoglycan heparan sulfate (HS) is exploited by many microbial pathogens as a means of adherence and invasion. Heparin, a widely used anticoagulant drug, is structurally similar to HS and is a common experimental proxy. Exogenous heparin prevents infection by a range of viruses, including S-associated coronavirus isolate HSR1. Here, we show that heparin inhibits severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) invasion of Vero cells by up to 80% at doses achievable through prophylaxis and, particularly relevant, within the range deliverable by nebulisation. Surface plasmon resonance and circular dichroism spectroscopy demonstrate that heparin and enoxaparin, a low-molecular-weight heparin which is a clinical anticoagulant, bind and induce a conformational change in the spike (S1) protein receptor-binding domain (S1 RBD) of SARS-CoV-2. A library of heparin derivatives and size-defined fragments were used to probe the structural basis of this interaction. Binding to the RBD is more strongly dependent on the presence of 2-O or 6-O sulfate groups than on N-sulfation and a hexasaccharide is the minimum size required for secondary structural changes to be induced in the RBD. It is likely that inhibition of viral infection arises from an overlap between the binding sites of heparin/HS on S1 RBD and that of the angiotensin-converting enzyme 2. The results suggest a route for the rapid development of a first-line therapeutic by repurposing heparin and its derivatives as antiviral agents against SARS-CoV-2 and other members of the Coronaviridae.
Keywords
heparin - coronavirus - SARS-CoV-2 - COVID-19 - spike - S1 - RBD - circular dichroism - surface plasmon resonance - molecular modelling∗ These authors are joint first authors.
∗∗ Senior authors.
Publication History
Received: 06 June 2020
Accepted: 13 October 2020
Article published online:
23 December 2020
© 2020. Thieme. All rights reserved.
Georg Thieme Verlag KG
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