Cited by 83Ubiquitin and proteasome pathwaysWnt/β-catenin signaling in development and cancerProtein Kinase Regulation and GTPase Signaling

SUMO-1 Modification of the C-terminal KVEKVD of Axin Is Required for JNK Activation but Has No Effect on Wnt Signaling

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Rui, Hong-Liang, Fan, Ernest, Zhou, Hai-Meng, Xu, Zhen, Zhang, Yi, Lin, Sheng-Cai·2002·Journal of Biological Chemistry

Abstract

Axin is a multifunctional protein, regulating Wnt signaling and the c-Jun N-terminal/stress-activated protein kinase (JNK/SAPK) pathway as well as tumorigenesis. In the present study, we found that Axin interacts with three SUMO-1 (small ubiquitin-related modifier) conjugating enzymes 3 (E3), PIAS1, PIASxbeta, and PIASy. The extreme C-terminal six amino acid residues of Axin are critical for the Axin/E3 interaction as deletion of the six residues (AxinDeltaC6) completely abolished the ability of Axin to interact with E3 enzymes. AxinDeltaC6 also failed to activate JNK, although it was intact in both its interaction with MEKK1 and homodimerization. Consistent with the presence of a doublet of the KV(E/D) sumoylation consensus motif at the C-terminal end (KVEKVD), we found that Axin is heavily sumoylated. Deletion of the C-terminal six amino acids drastically reduced sumoylation, indicating that the C-terminal six amino acids stretch is the main sumoylation site for Axin. Sumoylation-defective mutants failed to activate JNK but effectively destabilized beta-catenin and attenuated LEF1 transcriptional activity. In addition, we show that dominant negative Axin mutants blocked PIAS-mediated JNK activation, in accordance with the requirement of sumoylation for Axin-mediated JNK activation. Taken together, we demonstrate that sumoylation plays a role for Axin to function in the JNK pathway.

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Crossref · 10.1074/jbc.m208099200

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  • NEFA produced by adipocytes after adrenergic stimulation are strong inducers of the TLR-4/NF-kB system.

    “TLR-4 is the bacterial lipopolysaccharide (LPS) receptor, but data have shown that the NEFA produced by adipocytes after adrenergic stimulation are also strong inducers of the TLR-4/NF-kB system (95) (Fig. 5).”

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Authors
Rui, H.-L., Fan, E., Zhou, H.-M., Xu, Z., Zhang, Y., & Lin, S.-C.
Affiliations
  • Hong Kong University of Science and Technology (HK)
  • Tsinghua University (CN)
Corresponding author
Lin, Sheng-Cai
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2002-11
Volume
277
Issue
45
Pages
42981-42986
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2060134079
Cited by
83
References
50
Citations by year
2025: 1 · 2024: 1 · 2022: 1 · 2019: 3 · 2018: 1 · 2017: 5 · 2016: 2 · 2015: 4 · 2014: 4 · 2013: 3 · 2012: 6
FWCI
2.44
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Wnt/β-catenin signaling in development and cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
Keywords
Axin, SUMOylation, JNK activation, PIAS1, PIASy, E3 ubiquitin ligase, MEKK1, β-catenin degradation, Wnt signaling, c-Jun N-terminal kinase
MeSH terms
Amino Acid Sequence, Animals, Binding Sites, Cell Line, Cloning, Molecular, DNA-Binding Proteins, Enzyme Activation, Humans, Kidney, Peptide Fragments, Protein Processing, Post-Translational, Protein-Tyrosine Kinases, Proteins, Proto-Oncogene Proteins, Recombinant Fusion Proteins, Recombinant Proteins, Repressor Proteins, Saccharomyces cerevisiae, Transcription Factors, Signal Transduction, Consensus Sequence, Protein Serine-Threonine Kinases, Sequence Deletion, Dimerization, Mitogen-Activated Protein Kinases, SUMO-1 Protein, Zebrafish Proteins, JNK Mitogen-Activated Protein Kinases, MAP Kinase Kinase Kinase 1, Wnt Proteins, Mice, Lymphoid Enhancer-Binding Factor 1, Axin Protein

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