Molecular mechanism of the flexible glycan-receptor recognition by mumps virus.

A new interesting article has been published in J Virol. 2019 May 22. pii: JVI.00344-19. doi: 10.1128/JVI.00344-19. and titled:

Molecular mechanism of the flexible glycan-receptor recognition by mumps virus.

Authors of this article are:

Kubota M, Matsuoka R, Suzuki T, Yonekura K, Yanagi Y, Hashiguchi T.

A summary of the article is shown below:

Mumps virus (MuV) is an important aerosol-transmitted human pathogen causing epidemic parotitis, meningitis, encephalitis, and deafness. MuV preferentially uses a trisaccharide containing α2,3-linked sialic acid as a receptor. However, considering MuV tropism toward glandular tissues and the central nervous system, additional glycan motif(s) may also serve as receptors. Here we performed a large-scale glycan-array screen with MuV hemagglutinin-neuraminidase (MuV-HN) attachment proteins by using 600 types of glycans from The Consortium for Functional Glycomics Protein-Glycan Interaction Core in an effort to find new glycan-receptor motif(s). According to the results of the glycan array, we successfully determined the crystal structures of MuV-HN bound to newly identified glycan motifs, sialyl lewisX (SLeX) and the oligosaccharide portion of the GM2 ganglioside (GM2-glycan). Interestingly, the complex structures showed that SLeX and GM2-glycan share the same configuration with the reported trisaccharide motif, 3′-sialyllactose (3′-SL), at the binding site of MuV-HN, while SLeX and GM2-glycan have several unique interactions compared with 3′-SL. Thus, MuV-HN protein can allow an additional spatial modification in GM2-glycan and SLeX at the second and third carbohydrate from the nonreducing terminus of the core trisaccharide structure, respectively. Importantly, MuV entry was efficiently inhibited in the presence of 3′-SL, SLeX or GM2-glycan derivatives, which indicates that these motifs can serve as MuV receptors. The α2,3-sialylated oligosaccharides, such as SLeX and 3′-sialyllactosamine, are broadly expressed in various tissues, and GM2 exists mainly in neural tissues and the adrenal gland. The distribution of these glycan motifs in human tissues/organs may have bearing on MuV tropism.ImportanceMumps virus (MuV) infection is characterized by parotid gland swelling and can cause pancreatitis, orchitis, meningitis, and encephalitis. MuV-related hearing loss is also a serious complication because it is usually irreversible. MuV outbreaks have been reported in many countries, even in high-vaccine coverage areas. MuV has tropism toward glandular tissues and the central nervous system. To understand the unique MuV tropism, revealing the mechanism of receptor recognition by MuV is very important. Here, using a large-scale glycan array and X-ray crystallography, we show that MuV recognizes sialyl lewisX and GM2 ganglioside as receptors, in addition to a previously reported MuV receptor, a trisaccharide containing an α2,3-linked sialic acid. The flexible recognition of these glycan receptors by MuV may explain the unique tropism and pathogenesis of MuV. Structures will also provide a template for the development of effective entry inhibitors targeting the receptor-binding site of MuV.Copyright © 2019 American Society for Microbiology.

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