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Adenovirus serotype 26 utilises sialic acid bearing glycans as a primary cell entry receptor

Baker, Alexander T., Mundy, Rosie, Davies, James, Rizkillah, Pierre T. and Parker, Alan L. 2019. Adenovirus serotype 26 utilises sialic acid bearing glycans as a primary cell entry receptor. bioRxiv 10.1101/580076

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Adenoviruses are clinically important agents. They cause respiratory distress, gastroenteritis, and epidemic keratoconjunctivitis (EKC). As non-enveloped, double stranded DNA viruses, they are easily manipulated, making them popular vectors for therapeutic applications, including vaccines. Species D adenovirus serotype 26 (HAdV-D26) is both a cause of EKC and other disease, and a promising vaccine vector. HAdV-D26 derived vaccines are under investigation as protective platforms against HIV, Zika, RSV infections and are in Phase-III clinical trials for Ebola. We recently demonstrated that HAdV-D26 does not utilise CD46 or desmoglein 2 as entry receptors, whilst the putative interaction with Coxsackie and Adenovirus Receptor (CAR) is low affinity and unlikely to represent the primary cell receptor. Here, we definitively establish sialic acid as the primary entry receptor utilised by HAdV-D26. We demonstrate removal of cell surface sialic acid inhibits HAdV-D26 infection and provide a high-resolution crystal structure of HAdV-D26 fiber-knob in complex with sialic acid.

Item Type: Article
Date Type: Submission
Status: Submitted
Schools: Medicine
Publisher: Cold Spring Harbor Laboratory
Date of Acceptance: 21 June 2019
Last Modified: 12 Mar 2020 13:02

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