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Functional inactivation of oligosaccharyltransferase a isoform suppresses tumor metastasis

Yang Shi1,2, Yu Mizote3, Akinobu Honda4

  • 1Department of Glyco-Oncology and Medical Biochemistry, Research Center, Osaka International Cancer Institute, 3-1-69 Otemae, Chuo-ku, Osaka 541-8567, Japan.

Glycobiology
|January 7, 2026
PubMed

Insights

Oligosaccharyltransferase (OST) isoforms are crucial for cancer metastasis, not primary tumor growth. Targeting OST-A offers a potential strategy for treating metastatic cancers.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Oligosaccharyltransferase (OST) is a key enzyme complex in the endoplasmic reticulum (ER) responsible for N-linked glycosylation.
  • Mammals have two OST isoforms, OST-A and OST-B, with distinct specificities, but their roles in cancer progression are unclear.

Purpose of the Study:

  • To investigate the role of individual OST isoforms (OST-A and OST-B) in tumor progression and metastasis.
  • To identify potential therapeutic targets for refractory and metastatic cancers.

Main Methods:

  • Utilized a gene-edited mouse melanoma model to study OST isoform function.
  • Analyzed the impact of OST isoform knockout on subcutaneous tumor growth and experimental lung metastasis.
  • Investigated the role of the Stt3a subunit's N-terminal region in N-glycosylation and metastasis.

Main Results:

  • Knockout of individual OST isoforms did not affect subcutaneous tumor growth.
  • Co-expression of OST-A and OST-B was essential for efficient experimental lung metastasis.
  • The cytosolic N-terminal region of Stt3a (OST-A catalytic subunit) was critical for N-glycosylation and lung metastasis.

Conclusions:

  • Individual OST isoforms are dispensable for primary tumor growth but critical for metastasis.
  • Selective manipulation of OST-A activity presents a novel therapeutic strategy for metastatic cancers.
Keywords:
N-glycosylationendoplasmic reticulummetastasisoligosaccharyltransferase

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