SUMO-1 modification of IkappaBalpha inhibits NF-kappaB activation.
Activation of NF-kappaB is achieved by ubiquitination and proteasome-mediated degradation of IkappaBalpha. We have detected modified IkappaBalpha, conjugated to the small ubiquitin-like protein SUMO-1, which is resistant to signal-induced degradation. In the presence of an E1 SUMO-1-activating enzyme, Ubch9 conjugated SUMO-1 to IkappaBalpha primarily on K21, which is also utilized ... for ubiquitin modification. Thus, SUMO-1-modified IkappaBalpha cannot be ubiquitinated and is resistant to proteasome-mediated degradation. As a result, overexpression of SUMO-1 inhibits signal-induced activation of NF-kappaB-dependent transcription. Unlike ubiquitin modification, which requires phosphorylation of S32 and S36, SUMO-1 modification of IkappaBalpha is inhibited by phosphorylation. Thus, while ubiquitination targets proteins for rapid degradation, SUMO-1 modification acts antagonistically to generate proteins resistant to degradation.
Mesh Terms:
Amino Acid Sequence, Animals, Base Sequence, Binding Sites, Cell Line, Cysteine Endopeptidases, DNA, Recombinant, DNA-Binding Proteins, Humans, I-kappa B Proteins, Interleukin-1, Macromolecular Substances, Multienzyme Complexes, NF-kappa B, Proteasome Endopeptidase Complex, Recombinant Proteins, SUMO-1 Protein, Signal Transduction, Transcriptional Activation, Tumor Necrosis Factor-alpha, Ubiquitins
Amino Acid Sequence, Animals, Base Sequence, Binding Sites, Cell Line, Cysteine Endopeptidases, DNA, Recombinant, DNA-Binding Proteins, Humans, I-kappa B Proteins, Interleukin-1, Macromolecular Substances, Multienzyme Complexes, NF-kappa B, Proteasome Endopeptidase Complex, Recombinant Proteins, SUMO-1 Protein, Signal Transduction, Transcriptional Activation, Tumor Necrosis Factor-alpha, Ubiquitins
Mol. Cell
Date: Aug. 01, 1998
PubMed ID: 9734360
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