数字农科院2.0

Identification Of Chicken Cd74 As A Novel Cellular Attachment Receptor For Infectious Bursal Disease Virus In Bursa B Lymphocytes

文献类型： 外文期刊

作者： Liu, AJ; Pan, Q; Li, Y; Yan, N; Wang, J; Yang, B; Chen, ZH; Qi, XL; Gao, YL; Gao, L; Liu, CJ; Zhang, YP; Cui, HY; Li, K; Wang, YQ; Wang, XM

作者机构：

关键词： Ibdv; Cd74; Attachment Receptor; Virus Binding

期刊名称： JOURNAL OF VIROLOGY

ISSN： 0022-538X

年卷期： 2020 年 94 卷 2 期

页码：

收录情况： JCR（2021版）

摘要： Infectious bursal disease virus (IBDV) is an important member of the Birnaviridae family, causing severe immunosuppressive disease in chickens. The major capsid protein VP2 is responsible for the binding of IBDV to the host cell and its cellular tropism. In order to find proteins that potentially interact with IBDV VP2, a liquid chromatography-mass spectrometry (LC-MS) assay was conducted, and the host chicken CD74 protein was identified. Here, we investigate the role of chicken CD74 in IBDV attachment. Coimmunoprecipitation assays indicated that the extracellular domain of CD74 interacted with the VP2 proteins of multiple IBDV strains. Knockdown and overexpression experiments showed that CD74 promotes viral infectivity. Confocal assays showed that CD74 overexpression allows the attachment of IBDV and subvirus-like particles (SVPs) to the cell surface of nonpermissive cells, and quantitative PCR (qPCR) analysis further confirmed the attachment function of CD74. Anti-CD74 antibody, soluble CD74, depletion of CD74 by small interfering RNA (siRNA), and CD74 knockdown in the IBDV-susceptible DT40 cell line significantly inhibited IBDV binding, suggesting a pivotal role of this protein in virus attachment. These findings demonstrate that CD74 is a novel important receptor for IBDV attachment to the chicken B lymphocyte cell line DT40. IMPORTANCE CD74 plays a pivotal role in the correct folding and functional stability of major histocompatibility complex class II (MHC-II) molecules and in the presentation of antigenic peptides, acting as a regulatory factor in the antigen presentation process. In our study, we demonstrate a novel role of CD74 during IBDV infection, showing that chicken CD74 plays a significant role in IBDV binding to target B cells by interacting with the viral VP2 protein. This is the first report demonstrating that CD74 is involved as a novel attachment receptor in the IBDV life cycle in target B cells, thus contributing new insight into host-pathogen interactions.

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