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RNF4 negatively regulates NF-κB signaling by down-regulating TAB2.

  • Bo Tan‎ et al.
  • FEBS letters‎
  • 2015‎

Most of NF-κB (nuclear factor kappa B) signaling molecules have various types of post-translational modifications. In this study, we focused on ubiquitination and designed a siRNA library including most ubiquitin-binding domains. With this library, we identified several candidate regulators of canonical NF-κB pathway, including RNF4. Overexpression of RNF4 impaired NF-κB activation in a dose-dependent manner, whereas RNF4 knockdown potentiated NF-κB activation. We showed that RNF4 interacts with the TAK1-TAB2-TAB3 complex, but not TAB1. Further, we found that RNF4 specifically down-regulated TAB2 through a lysosomal pathway, and knockdown of RNF4 impaired endogenous TAB2 degradation. Therefore, our findings will provide new insights into the negative regulation of NF-κB signaling.


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