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Updated: Jul 19, 2025

Functional Characterization of RING-Type E3 Ubiquitin Ligases In Vitro and In Planta
Published on: December 5, 2019
Zooming into the structure-function of RING finger proteins for anti-cancer therapeutic applications
Mary George1, Priscilla Masamba1, Bamidele Abiodun Iwalokun2
1Molecular Biophysics and Structural Biology (MBSB) Group, Department of Biochemistry, Faculty of Science, University of Johannesburg, Auckland Park Kingsway Campus Auckland Park, Johannesburg, South Africa.
Abstract:
Cancer is one of the most common and widely diagnosed diseases worldwide. With an increase in prevalence and incidence, many studies in cancer biology have been looking at the role pro-cancer proteins play. One of these proteins is the Really Interesting New Gene (RING), which has been studied extensively due to its structure and functions such as apoptosis, neddylation, and its role in ubiquitination. The RING domain is a cysteine-rich domain known to bind Cysteine and Histidine residues. It also binds two zinc ions that help stabilize the protein in various patterns, often with a 'cross-brace' topology. Different RING finger proteins have been studied and found to have suitable targets for developing anti-cancer therapeutics. These identified candidate proteins include Parkin, COP1, MDM2, BARD1, BRCA-1, PIRH2, c-CBL, SIAH1, RBX1 and RNF8. Inhibiting these candidate proteins provides opportunities for shutting down pathways associated with tumour development and metastasis.
Insights
The Really Interesting New Gene (RING) protein family plays a key role in cancer development. Targeting these pro-cancer proteins offers a promising strategy for novel anti-cancer therapeutics to inhibit tumor growth.
Area of Science:
- Biochemistry
- Molecular Biology
- Oncology
Background:
- Cancer is a leading global disease with increasing incidence.
- Pro-cancer proteins are critical targets for therapeutic intervention.
- The Really Interesting New Gene (RING) domain is implicated in key cellular processes relevant to cancer.
Purpose of the Study:
- To review the structure and function of RING finger proteins in cancer biology.
- To identify specific RING finger proteins as potential therapeutic targets.
- To explore the potential of inhibiting these proteins for anti-cancer drug development.
Main Methods:
- Literature review of studies on RING finger protein structure and function.
- Analysis of known roles in apoptosis, neddylation, and ubiquitination.
- Identification of specific RING finger proteins implicated in tumorigenesis.
Main Results:
- The RING domain is a cysteine-rich, zinc-binding motif crucial for protein stability and function.
- Several RING finger proteins (e.g., Parkin, MDM2, BRCA-1) are validated targets in cancer.
- Inhibition of these proteins can disrupt pathways driving tumor development and metastasis.
Conclusions:
- RING finger proteins are vital regulators of cellular processes and are frequently dysregulated in cancer.
- Targeting specific RING finger proteins represents a viable strategy for developing new anti-cancer therapies.
- Further research into RING protein inhibitors holds significant therapeutic potential for cancer treatment.
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