Neutral sphingomyelinase 2 activity and protein stability are modulated by phosphorylation of five conserved serines

Simone Filosto, Majid Ashfaq, Samuel Chung, William Fry, Tzipora Goldkorn

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

We previously presented that the neutral sphingomyelinase 2 (nSMase2) is the only SMase activated in human airway epithelial (HAE) cells following exposure to oxidative stress (oxstress), yielding ceramide accumulation and thereby inducing apoptosis. Furthermore, we reported that nSMase2 is a phospho-protein in which the level of phosphorylation controls nSMase2 activation induced by ox-stress. Here we identify five specific serines that are phosphorylated in nSMase2 and demonstrate that their phosphorylation controls the nSMase2 activity upon ox-stress exposure in an interdependent manner. Furthermore, we show that the nSMase2 protein stability and thus its level of expression is also post-translationally regulated by these five serine phosphorylation sites. This study provides initial structure/function insights regarding nSMase2 phosphorylation sites and offers some new links for future studies aiming to fully elucidate nSMase2 regulatory machinery.

Original languageEnglish (US)
Pages (from-to)514-522
Number of pages9
JournalJournal of Biological Chemistry
Volume287
Issue number1
DOIs
StatePublished - Jan 2 2012

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Fingerprint Dive into the research topics of 'Neutral sphingomyelinase 2 activity and protein stability are modulated by phosphorylation of five conserved serines'. Together they form a unique fingerprint.

  • Cite this