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Functional Characterization of RING-Type E3 Ubiquitin Ligases In Vitro and In Planta
10:27

Functional Characterization of RING-Type E3 Ubiquitin Ligases In Vitro and In Planta

Published on: December 5, 2019

Ring finger protein 146/Iduna is a poly(ADP-ribose) polymer binding and PARsylation dependent E3 ubiquitin ligase

Zhi-dong Zhou1, Christine Hui-shan Chan, Zhi-cheng Xiao

  • 1National Neuroscience Institute, Singapore.

Cell Adhesion & Migration
|January 26, 2012
PubMed

Insights

Ring finger protein 146 (RNF146), or iduna, offers neuroprotection by inhibiting PAR-dependent cell death (Parthanatos). Its E3 ligase activity regulates key cellular processes, suggesting therapeutic potential for various diseases.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Biochemistry

Background:

  • Parthanatos is a programmed cell death pathway regulated by Poly(ADP-ribose) (PAR) and implicated in numerous human diseases.
  • Ring finger protein 146 (RNF146), also known as iduna, is recognized for its potential neuroprotective functions.

Purpose of the Study:

  • To investigate the role of RNF146/Iduna in regulating Parthanatos and its implications in cellular injury and disease.
  • To explore the enzymatic activity and regulatory mechanisms of RNF146/Iduna in DNA repair and Wnt signaling pathways.

Main Methods:

  • The study focuses on the biochemical and cellular functions of RNF146/Iduna, including its interaction with Poly(ADP-ribose) (PAR).
  • Analysis of RNF146/Iduna's E3 ubiquitin ligase activity, particularly its role in the degradation of target proteins like axin and nuclear factors involved in DNA repair.
  • Investigating the translocation of RNF146/Iduna to the nucleus following cellular injury.

Main Results:

  • RNF146/Iduna inhibits Parthanatos by binding to PAR, demonstrating neuroprotective properties.
  • RNF146/Iduna functions as a PARsylation-directed E3 ubiquitin ligase, promoting tankyrase-dependent degradation of axin and positively regulating Wnt signaling.
  • RNF146/Iduna facilitates DNA repair and protects cells from damage induced by genotoxic agents and gamma irradiation, partly through ubiquitination and degradation of nuclear proteins.

Conclusions:

  • RNF146/Iduna plays a critical role in cellular protection against DNA damage and Parthanatos-induced cell death.
  • The PAR-binding and E3 ligase activity of RNF146/Iduna are crucial for its functions in DNA repair and Wnt signaling.
  • Modulating RNF146/Iduna activity presents a potential therapeutic strategy for diseases involving PAR and PAR-binding proteins, including neurodegenerative disorders and cancer.

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