NKp46 O-glycan Sequences That Are Involved in the Interaction with Hemagglutinin Type 1 of Influenza Virus
Overview
Authors
Affiliations
Natural killer (NK) cells serve as a crucial first-line defense against tumors and virus-infected cells. We previously showed that lysis of influenza virus (IV)-infected cells is mediated by the interaction between the NK receptor, NKp46, and the IV hemagglutinin (HA) type 1 expressed by the infected cells. This interaction requires the presence of sialyl groups on the NKp46-T225 O-glycoforms. In the current study, we analyzed the O-glycan sequences that are imperative for the interaction between recombinant NKp46 (rNKp46) and IV H1N1 strains. We first showed that rNKp46 binding to IV H1N1 is not mediated by a glycoform unique to the Thr225 site. We then characterized the O-glycan sequences that mediate the interaction of rNKp46 and IV H1N1; we employed rNKp46s with dissimilar glycosylation patterns and IV H1N1 strains with different sialic acid alpha2,3 and alpha2,6 linkage preferences. The branched alpha2,3-sialylated O-glycoform Neu5NAcalpha2,3-Galbeta1,4-GlcNAcbeta1,6[Neu5NAcalpha2,3-Galbeta1,3]GalNAc competently mediated the interaction of rNKp46 with IV H1N1, manifesting a preference for alpha2,3 linkage. In contrast, the linear alpha2,3-sialylated O-glycoform Neu5NAcalpha2,3-Galbeta1,3-GalNAc was not correlated with enhanced interaction between rNKp46 and IV H1N1 or a preference for alpha2,3 linkage. The branched alpha2,3- and alpha2,6-sialylated O-glycoform Neu5NAcalpha2,3-Galbeta1,3[Neu5NAcalpha2,6]GalNAc competently mediated the interaction of rNKp46 with IV H1N1, manifesting a preference for alpha2,6 linkage. Previous viral HA-binding-specificity studies were performed with glycopolymer conjugates, free synthetic sialyl oligosaccharides, and sialidase-treated cells. This study shed light on the O-glycan sequences involved in the interaction of glycoprotein and viral hemagglutinins and may help in the design of agents inhibitory to hemagglutinin for influenza treatment.
Advancements in the Study of the Immune Molecule NKp46 in Immune System-related Diseases.
Qian S, Zhou Y, Jin Z, Li X, Tian Y, Chen F Clin Rev Allergy Immunol. 2024; 67(1-3):96-110.
PMID: 39612130 PMC: 11638288. DOI: 10.1007/s12016-024-09010-5.
O-glycosylation in viruses: A sweet tango.
Ming A, Zhao J, Liu Y, Wang Y, Wang X, Li J mLife. 2024; 3(1):57-73.
PMID: 38827513 PMC: 11139210. DOI: 10.1002/mlf2.12105.
Natural Killer Cell-Based Immunotherapy against Glioblastoma.
Morimoto T, Nakazawa T, Maeoka R, Nakagawa I, Tsujimura T, Matsuda R Int J Mol Sci. 2023; 24(3).
PMID: 36768432 PMC: 9916747. DOI: 10.3390/ijms24032111.
Contribution of natural killer cells in innate immunity against colorectal cancer.
Ghazvinian Z, Abdolahi S, Tokhanbigli S, Tarzemani S, Piccin A, Zali M Front Oncol. 2023; 12:1077053.
PMID: 36686835 PMC: 9846259. DOI: 10.3389/fonc.2022.1077053.
Human C1q Regulates Influenza A Virus Infection and Inflammatory Response via Its Globular Domain.
Varghese P, Kishore U, Rajkumari R Int J Mol Sci. 2022; 23(6).
PMID: 35328462 PMC: 8949502. DOI: 10.3390/ijms23063045.