数字农科院2.0

Cellular SLC35B4 promotes internalization during influenza A virus entry

文献类型： 外文期刊

作者： Wang, Guangwen;Jiang, Li;Yan, Ya;Kong, Fandi;Li, Qibing;Zhang, Jie;Hou, Shuangshuang;Wang, Bo;Wang, Xiurong;Kong, Huihui;Deng, Guohua;Shi, Jianzhong;Tian, Guobin;Zeng, Xianying;Chen, Hualan;Li, Chengjun

作者机构：

关键词： influenza A virus; internalization; SLC35B4; AGRN; heparan sulfate modification; AP2B1

期刊名称： MBIO

ISSN：

年卷期： 2025 年

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收录情况： SCIE（2025版）

摘要： SLC35B4, a nucleotide sugar transporter that mediates the transport of UDP-GlcNAc and UDP-xylose, was found to be required for the replication of influenza A virus (IAV) of the H5N1 subtype in our genome-wide siRNA library screen. We found that defective IAV replication in SLC35B4-deficient A549 cells was independent of virus strain specificity, and the virulence of IAV in Slc35b4 knockdown mice was also decreased. By examining the individual stages of the IAV replication cycle, we discovered that the amount of internalized IAV was significantly reduced in SLC35B4-knockout A549 cells. Mechanistically, SLC35B4 facilitated IAV replication by transporting UDP-xylose, which attaches to the serine residue of heparan sulfate proteoglycans (HSPGs) in the heparan sulfate (HS) biosynthesis pathway. Knockdown of associated host factors (i.e., XYLT2, B4GALT7, EXT1, and EXT2) in the HS biosynthesis pathway also impaired IAV replication. Furthermore, we revealed that AGRN, a unique HSPG family member, was important for the endocytosis of IAV in A549 cells. Moreover, we found that the homeostasis of the AGRN protein was regulated by HS modification mediated by the initial UDP-xylose transporter SLC35B4, thereby affecting the expression level of endocytic adapter AP2B1 to influence IAV internalization. Collectively, these findings establish that SLC35B4 is an important regulator of IAV replication and uncover the underlying mechanisms by which SLC35B4 employs UDP-xylose transport activity to promote IAV internalization.

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