Article (Scientific journals)
RIPK4 activity in keratinocytes is controlled by the SCF(beta-TrCP) ubiquitin ligase to maintain cortical actin organization.
Tanghe, Giel; Urwyler-Rosselet, Corinne; De Groote, Philippe et al.
2018In Cellular and Molecular Life Sciences
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Keywords :
Degradation; Keratinocytes; PKC; Proteasome; RIPK4; beta-TrCP
Abstract :
[en] RIPK4 is a key player in epidermal differentiation and barrier formation. RIPK4 signaling pathways controlling keratinocyte proliferation and differentiation depend on its kinase activity leading to Dvl2, Pkp1 and IRF6 phosphorylation and NF-kappaB activation. However, the mechanism regulating RIPK4 activity levels remains elusive. We show that cultured keratinocytes display constitutive active phosphorylated RIPK4 while PKC signaling can trigger RIPK4 activation in various non-keratinocyte cell lines, in which RIPK4 is present in a non-phosphorylated state. Interestingly, we identified the SCF(beta-TrCP) ubiquitin E3 ligase complex responsible for regulating the active RIPK4 protein level. The SCF(beta-TrCP) complex binds to a conserved phosphodegron motif in the intermediate domain of RIPK4, subsequently leading to K48-linked ubiquitinylation and degradation. The recruitment of beta-TrCP is dependent on RIPK4 activation and trans-autophosphorylation. beta-TrCP knock-down resulted in RIPK4-dependent formation of actin stress fibers, cell scattering and increased cell motility, suggesting that tight control of RIPK4 activity levels is crucial to maintain cell shape and behavior in keratinocytes.
Disciplines :
Immunology & infectious disease
Author, co-author :
Tanghe, Giel
Urwyler-Rosselet, Corinne
De Groote, Philippe
Dejardin, Emmanuel  ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > GIGA-R : Labo of Molecular Immunol. and Signal Transduction
De Bock, Pieter-Jan
Gevaert, Kris
Vandenabeele, Peter
Declercq, Wim
Language :
English
Title :
RIPK4 activity in keratinocytes is controlled by the SCF(beta-TrCP) ubiquitin ligase to maintain cortical actin organization.
Publication date :
2018
Journal title :
Cellular and Molecular Life Sciences
ISSN :
1420-682X
eISSN :
1420-9071
Publisher :
Birkhauser Verlag, Switzerland
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 20 June 2018

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