S100A10 Regulates ULK1 Localization to ER–Mitochondria Contact Sites in IFN-γ-Triggered Autophagy

Ying Da Chen, Yi Ting Fang, Chih Peng Chang, Chiou Feng Lin, Li Jin Hsu, Shang Rung Wu, Yen Chi Chiu, Robert Anderson, Yee Shin Lin

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

During the process of autophagy, the autophagy-related proteins are translocated to autophagosome formation sites. Here, we demonstrate that S100A10 is required for ULK1 localization to autophagosome formation sites. Silencing of S100A10 reduces IFN-γ-induced autophagosome formation. We also determined the role of annexin A2 (ANXA2), a binding partner of S100A10, which has been reported to promote phagophore assembly. Silencing of ANXA2 reduced S100A10 expression. However, overexpression of S100A10 in ANXA2-silenced cells was still able to enhance autophagosome formation, suggesting that ANXA2 regulates IFN-γ-induced autophagy through S100A10. We also observed that S100A10 interacted with ULK1 after IFN-γ stimulation, and S100A10 knockdown prevented ULK1 localization to autophagosome formation sites. Finally, the release of high mobility group protein B1, one of the functions mediated by IFN-γ-induced autophagy, was inhibited in S100A10 knockdown cells. These results elucidate the importance of S100A10 in autophagosome formation and reveal the relationship between S100A10 and ULK1 in IFN-γ-induced autophagy.

Original languageEnglish
Pages (from-to)142-157
Number of pages16
JournalJournal of Molecular Biology
Volume429
Issue number1
DOIs
Publication statusPublished - 2017 Jan 6

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All Science Journal Classification (ASJC) codes

  • Structural Biology
  • Molecular Biology

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