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Antirotaviral activity of bovine milk components: Extending the list of inhibitory proteins and seeking a better understanding of their neutralization mechanism. J Funct Foods 2018. [DOI: 10.1016/j.jff.2018.03.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Mishra R, Yu X, Kishor C, Holloway G, Lau K, von Itzstein M, Coulson BS, Blanchard H. Specificity and affinity of neuraminic acid exhibited by canine rotavirus strain K9 carbohydrate-binding domain (VP8*). J Mol Recognit 2018; 31:e2718. [PMID: 29687510 DOI: 10.1002/jmr.2718] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 03/04/2018] [Accepted: 03/06/2018] [Indexed: 12/23/2022]
Abstract
The outer capsid spike protein VP4 of rotaviruses is a major determinant of infectivity and serotype specificity. Proteolytic cleavage of VP4 into 2 domains, VP8* and VP5*, enhances rotaviral infectivity. Interactions between the VP4 carbohydrate-binding domain (VP8*) and cell surface glycoconjugates facilitate initial virus-cell attachment and subsequent cell entry. Our saturation transfer difference nuclear magnetic resonance (STD NMR) and isothermal titration calorimetry (ITC) studies demonstrated that VP8*64-224 of canine rotavirus strain K9 interacts with N-acetylneuraminic and N-glycolylneuraminic acid derivatives, exhibiting comparable binding epitopes to VP8* from other neuraminidase-sensitive animal rotaviruses from pigs (CRW-8), cattle (bovine Nebraska calf diarrhoea virus, NCDV), and Rhesus monkeys (Simian rhesus rotavirus, RRV). Importantly, evidence was obtained for a preference by K9 rotavirus for the N-glycolyl- over the N-acetylneuraminic acid derivative. This indicates that a VP4 serotype 5A rotavirus (such as K9) can exhibit a neuraminic acid receptor preference that differs from that of a serotype 5B rotavirus (such as RRV) and the receptor preference of rotaviruses can vary within a particular VP4 genotype.
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Affiliation(s)
- Rahul Mishra
- Institute for Glycomics, Griffith University, Gold Coast, Queensland, Australia
| | - Xing Yu
- Institute for Glycomics, Griffith University, Gold Coast, Queensland, Australia
| | - Chandan Kishor
- Institute for Glycomics, Griffith University, Gold Coast, Queensland, Australia
| | - Gavan Holloway
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Victoria, Australia
| | - Kam Lau
- Institute for Glycomics, Griffith University, Gold Coast, Queensland, Australia
| | - Mark von Itzstein
- Institute for Glycomics, Griffith University, Gold Coast, Queensland, Australia
| | - Barbara S Coulson
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Victoria, Australia
| | - Helen Blanchard
- Institute for Glycomics, Griffith University, Gold Coast, Queensland, Australia
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