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The fiber knob protein of human adenovirus type 49 mediates highly efficient and promiscuous infection of cancer cell lines using a novel cell entry mechanism

DOI: 10.1128/JVI.01849-20 DOI Help

Authors: Alexander T. Baker (Cardiff University) , James A. Davies (Cardiff University) , Emily A. Bates (Cardiff University) , Elise Moses (Cardiff University) , Rosie M. Mundy (Cardiff University) , Gareth Marlow (Cardiff University) , David K. Cole (Cardiff University) , Carly M. Bliss (Cardiff University) , Pierre J. Rizkallah (Cardiff University) , Alan L. Parker (Cardiff University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Virology

State: Published (Approved)
Published: December 2020
Diamond Proposal Number(s): 18812

Open Access Open Access

Abstract: The human adenovirus (HAdV) phylogenetic tree is diverse, divided across seven species and comprising over 100 individual types. Species D HAdV are rarely isolated with low rates of pre-existing immunity, making them appealing for therapeutic applications. Several species D vectors have been developed as vaccines against infectious diseases where they induce robust immunity in pre-clinical models and early phase clinical trials. However, many aspects of the basic virology of species D HAdV, including their basic receptor usage and means of cell entry, remain understudied. Here, we investigated HAdV-D49, which previously has been studied for vaccine and vascular gene transfer applications. We generated a pseudotyped HAdV-C5 presenting the HAdV-D49 fiber knob protein (HAdV-C5/D49K). This pseudotyped vector was efficient at infecting cells devoid of all known HAdV receptors, indicating HAdV-D49 uses an unidentified cellular receptor. Conversely, a pseudotyped vector presenting the fiber knob protein of the closely related HAdV-D30 (HAdV-C5/D30K), differing in four amino acids to HAdV-D49, failed to demonstrate the same tropism. These four amino acid changes resulted in a change in isoelectric point of the knob protein, with HAdV-D49K possessing a basic apical region compared to a more acidic region in HAdV-D30K. Structurally and biologically we demonstrate that HAdV-D49 knob protein is unable to engage CD46, while potential interaction with CAR is extremely limited by extension of the DG loop. HAdV-C5/49K efficiently transduced cancer cell lines of pancreatic, breast, lung, oesophageal and ovarian origin, indicating it may have potential for oncolytic virotherapy applications, especially for difficult to transduce tumor types.

Diamond Keywords: Viruses

Subject Areas: Biology and Bio-materials, Medicine

Instruments: I03-Macromolecular Crystallography

Added On: 16/12/2020 11:28

Journal of Virology-2020-Baker-JVI.01849-20.full.pdf

Discipline Tags:

Non-Communicable Diseases Health & Wellbeing Cancer Biochemistry Chemistry Structural biology Drug Discovery Life Sciences & Biotech

Technical Tags:

Diffraction Macromolecular Crystallography (MX)