MAPK11 or MAPK14 phosphorylates NCF1 at Ser345

Stable Identifier
Reaction [transition]
Homo sapiens
p38 MAPK phosphorylates NCF1 at Ser345
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In resting cells, the neutrophil cytosolic factor 1 (NCF1, also known as p47phox), NCF2 (p67phox), and NCF4 (p40phox) are located in the cytosol where they associate in a trimer complex with a 1:1:1 stoichiometry through specific domains (Groemping Y & Rittinger K 2005; El-Benna J et al. 2005; Park JW et al. 1994; Lapouge K et al. 2002; El-Benna J et al. 2016). However, NCF1 may also exist separately from the trimer (El-Benna J et al. 2016). In the resting state, two SH3 domains of NCF1 (p47phox) bind the auto‐inhibitory region (AIR; amino acids 292‐340) to keep NCF1 in a closed auto‐inhibited state, preventing its binding to p22phox and therefore NOX2 activation (Groemping Y et al. 2003; Yuzawa S et al. 2004; El-Benna J et al. 2016). Priming of neutrophils by several agents such as GM‐CSF, TNFα, PAF, LPS and CL097, a TLR7/8 agonist, induces partial phosphorylation of NCF1 (Makni-Maalej K et al. 2015; Dang PM et al. 1999; Dewas C et al. 2003; DeLeo FR et al. 1998). Mass spectrometry analysis of NCF1 identified Ser345 as the phosphorylated site in human neutrophils primed by TNFα and GM‐CSF (Dang PMC et al. 2006). Site‐directed mutagenesis of Ser345 and use of a competitive inhibitory peptide containing the Ser345 sequence have demonstrated that this step is critical for the priming of ROS production in human neutrophils (Dang PMC et al. 2006). Further, inhibitors of the p38 MAPK abrogated TNF-alpha- and TLR8 agonist-induced phosphorylation of Ser345 (Dang PMC et al. 2006; Makni-Maalej K et al. 2015).

Literature References
PubMed ID Title Journal Year
16778989 A specific p47phox -serine phosphorylated by convergent MAPKs mediates neutrophil NADPH oxidase priming at inflammatory sites

Jensen, ON, Gougerot-Pocidalo, MA, El-Benna, J, Dang, PM, Hayem, G, Boussetta, T, Dewas, C, Stensballe, A, Kroviarski, Y, Raad, H

J. Clin. Invest. 2006
27558335 Priming of the neutrophil respiratory burst: role in host defense and inflammation

Marie, JC, Gougerot-Pocidalo, MA, Dang, PM, El-Benna, J, Hurtado-Nedelec, M, Marzaioli, V

Immunol. Rev. 2016
14530365 TNF-alpha induces phosphorylation of p47(phox) in human neutrophils: partial phosphorylation of p47phox is a common event of priming of human neutrophils by TNF-alpha and granulocyte-macrophage colony-stimulating factor

Gougerot-Pocidalo, MA, Dewas, C, El-Benna, J, Dang, PM

J. Immunol. 2003
25877926 TLR8, but not TLR7, induces the priming of the NADPH oxidase activation in human neutrophils

Belambri, SA, Gougerot-Pocidalo, MA, El-Benna, J, Dang, PM, Hurtado-Nedelec, M, Makni-Maalej, K, Boussetta, T, Marzaioli, V

J. Leukoc. Biol. 2015
Catalyst Activity

protein serine/threonine kinase activity of p-p38 MAPK alpha/beta [cytosol]

Orthologous Events
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