Abstract
The RING domain protein RNF11 is overexpressed in breast cancers and promotes tumour growth factor-beta (TGF-beta) signalling. RNF11 has been proposed to regulate TGF-beta signalling by interacting with HECT- and SCF-type E3 ligases; however, the role of RNF11 in other signalling pathways is poorly understood. Here, we demonstrate a novel function of RNF11 as a negative regulator of NF-kappaB and jun N-terminal kinase (JNK) signalling pathways. Knockdown of RNF11 with siRNA resulted in persistent tumour necrosis factor (TNF)- and lipopolysaccharide (LPS)-mediated NF-kappaB and JNK signalling. RNF11 interacted with the NF-kappaB inhibitor A20 and its regulatory protein TAX1BP1 in a stimulus-dependent manner. RNF11 negatively regulated RIP1 and TRAF6 ubiquitination upon stimulation with TNF and LPS, respectively. Furthermore, RNF11 was required for A20 to interact with and inactivate RIP1 to inhibit TNF-mediated NF-kappaB activation. Our studies reveal that RNF11, together with TAX1BP1 and Itch, is an essential component of an A20 ubiquitin-editing protein complex that ensures transient activation of inflammatory signalling pathways.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Carrier Proteins / genetics
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Carrier Proteins / metabolism*
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Cell Line
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DNA-Binding Proteins
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Down-Regulation
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Gene Knockdown Techniques
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Humans
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Intracellular Signaling Peptides and Proteins / metabolism
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Intracellular Signaling Peptides and Proteins / physiology*
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JNK Mitogen-Activated Protein Kinases / physiology
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Lipopolysaccharides / pharmacology
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Monocytes / metabolism
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NF-kappa B / physiology*
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Neoplasm Proteins / metabolism
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Nuclear Pore Complex Proteins / metabolism
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Nuclear Proteins / physiology*
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Protein Binding
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Protein Structure, Tertiary
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RNA, Small Interfering / genetics
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RNA-Binding Proteins / metabolism
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Signal Transduction / physiology
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TNF Receptor-Associated Factor 6 / metabolism
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Transforming Growth Factor beta / pharmacology
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Tumor Necrosis Factor alpha-Induced Protein 3
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Ubiquitin-Protein Ligases / physiology*
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Ubiquitination
Substances
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AGFG1 protein, human
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Carrier Proteins
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DNA-Binding Proteins
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Intracellular Signaling Peptides and Proteins
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Lipopolysaccharides
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NF-kappa B
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Neoplasm Proteins
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Nuclear Pore Complex Proteins
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Nuclear Proteins
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RNA, Small Interfering
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RNA-Binding Proteins
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RNF11 protein, human
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TAX1BP1 protein, human
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TNF Receptor-Associated Factor 6
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Transforming Growth Factor beta
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Ubiquitin-Protein Ligases
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JNK Mitogen-Activated Protein Kinases
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TNFAIP3 protein, human
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Tumor Necrosis Factor alpha-Induced Protein 3