Scholarlink

<p>Coat protein complex II (COPII) mediates anterograde trafficking from the endoplasmic reticulum (ER). While the core COPII machinery is well-characterized, how cells regulate COPII to accommodate large cargoes, including collagens, remains incompletely understood. Here, we show that the cargo-selecting COPII subunit Sec24D is modified by site-specific O-linked β-<i>N</i>-acetylglucosamine (O-GlcNAc) in its N-terminal intrinsically disordered region upon induction of collagen transport. These glycosylations are required for collagen trafficking in human cells and developing zebrafish. Crosslinking proteomics demonstrated that each O-GlcNAcylation influences the Sec24D interactome in a distinct way, regulating nearly all steps of COPII-mediated transport through protein-protein interactions. In particular, myoferlin interacts with glycosylated Sec24D and unexpectedly facilitates fusion of ER exit sites (ERES) and the ER-Golgi intermediate compartment (ERGIC) to enable collagen transport. Our results establish Sec24D O-GlcNAcylation as a dynamic regulator of COPII protein-protein interactions and collagen trafficking and identify myoferlin as a mediator of this process.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Site-specific glycosylation of Sec24D and myoferlin recruit ERGIC to ER exit sites for collagen trafficking

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月13日

查看全文
  • Tetsuya Hirata,
  • Dharmendra Choudhary,
  • Quyen Nguyen,
  • Brittany J. Bisnett,
  • Erik J. Soderblom,
  • Ela W. Knapik,
  • Michael Boyce

摘要

Coat protein complex II (COPII) mediates anterograde trafficking from the endoplasmic reticulum (ER). While the core COPII machinery is well-characterized, how cells regulate COPII to accommodate large cargoes, including collagens, remains incompletely understood. Here, we show that the cargo-selecting COPII subunit Sec24D is modified by site-specific O-linked β-N-acetylglucosamine (O-GlcNAc) in its N-terminal intrinsically disordered region upon induction of collagen transport. These glycosylations are required for collagen trafficking in human cells and developing zebrafish. Crosslinking proteomics demonstrated that each O-GlcNAcylation influences the Sec24D interactome in a distinct way, regulating nearly all steps of COPII-mediated transport through protein-protein interactions. In particular, myoferlin interacts with glycosylated Sec24D and unexpectedly facilitates fusion of ER exit sites (ERES) and the ER-Golgi intermediate compartment (ERGIC) to enable collagen transport. Our results establish Sec24D O-GlcNAcylation as a dynamic regulator of COPII protein-protein interactions and collagen trafficking and identify myoferlin as a mediator of this process.