SPRING is a Dedicated Licensing Factor for SREBP-Specific Activation by S1P

Sebastian Hendrix, Josephine M.E. Tan, Klevis Ndoj, Jenina Kingma, Masoud Valiloo, Lobke F. Zijlstra, Roelof Ottenhoff, Nabil G. Seidah, Anke Loregger, Daniel L. Kober, Noam Zelcer

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

SREBP transcription factors are central regulators of lipid metabolism. Their proteolytic activation requires ER to the Golgi translocation and subsequent cleavage by site-1-protease (S1P). Produced as a proprotein, S1P undergoes autocatalytic cleavage from its precursor S1PA to mature S1PC form. Here, we report that SPRING (previously C12ORF29) and S1P interact through their ectodomains, and that this facilitates the autocatalytic cleavage of S1PA into its mature S1PC form. Reciprocally, we identified a S1P recognition-motif in SPRING and demonstrate that S1P-mediated cleavage leads to secretion of the SPRING ectodomain in cells, and in liver-specific Spring knockout (LKO) mice transduced with AAV-mSpring. By reconstituting SPRING variants into SPRINGKO cells we show that the SPRING ectodomain supports proteolytic maturation of S1P and SREBP signaling, but that S1P-mediated SPRING cleavage is not essential for these processes. Absence of SPRING modestly diminishes proteolytic maturation of S1PA→C and trafficking of S1PC to the Golgi. However, despite reaching the Golgi in SPRINGKO cells, S1PC fails to rescue SREBP signaling. Remarkably, whereas SREBP signaling was severely attenuated in SPRINGKO cells and LKO mice, that of ATF6, another S1P substrate, was unaffected in these models. Collectively, our study positions SPRING as a dedicated licensing factor for SREBP-specific activation by S1P.

Original languageEnglish (US)
Pages (from-to)123-137
Number of pages15
JournalMolecular and cellular biology
Volume44
Issue number4
DOIs
StatePublished - 2024
Externally publishedYes

Keywords

  • C12ORF49
  • Cholesterol metabolism
  • S1P
  • SPRING
  • SREBP
  • cholesterol regulation
  • lipid metabolism
  • post-transcriptional regulation
  • proteolysis
  • proteolytic enzyme

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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