O-GlcNAcylation of TAB1 modulates TAK1-mediated cytokine release

Shalini Pathak, Vladimir S. Borodkin, Osama Albarbarawi, David G. Campbell, Adel Ibrahim, Daan M. F. van Aalten (Lead / Corresponding author)

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    127 Citations (Scopus)


    Transforming growth factor (TGF)-beta-activated kinase 1 (TAK1) is a key serine/threonine protein kinase that mediates signals transduced by pro-inflammatory cytokines such as transforming growth factor-beta, tumour necrosis factor (TNF), interleukin-1 (IL-1) and wnt family ligands. TAK1 is found in complex with binding partners TAB1-3, phosphorylation and ubiquitination of which has been found to regulate TAK1 activity. In this study, we show that TAB1 is modified with N-acetylglucosamine (O-GlcNAc) on a single site, Ser395. With the help of a novel O-GlcNAc site-specific antibody, we demonstrate that O-GlcNAcylation of TAB1 is induced by IL-1 and osmotic stress, known inducers of the TAK1 signalling cascade. By reintroducing wild-type or an O-GlcNAc-deficient mutant TAB1 (S395A) into Tab1(-/-) mouse embryonic fibroblasts, we determined that O-GlcNAcylation of TAB1 is required for full TAK1 activation upon stimulation with IL-1/osmotic stress, for downstream activation of nuclear factor kappa B and finally production of IL-6 and TNF alpha. This is one of the first examples of a single O-GlcNAc site on a signalling protein modulating a key innate immunity signalling pathway. The EMBO Journal (2012) 31, 1394-1404. doi:10.1038/emboj. 2012.8; Published online 3 February 2012

    Original languageEnglish
    Pages (from-to)1394-1404
    Number of pages11
    JournalEMBO Journal
    Issue number6
    Publication statusPublished - 21 Mar 2012


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