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Related Concept Videos

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Covalently Linked Protein Regulators

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Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
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Related Experiment Video

Updated: Jul 18, 2025

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

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Artificial RING finger reveals unique auto-ubiquitination with E2 specificity.

Kazuhide Miyamoto1, Atsushi Matsumoto1

  • 1Faculty of Pharmaceutical Sciences, Sanyo-Onoda City University, Yamaguchi, Japan.

Protein Science : a Publication of the Protein Society
|August 25, 2023
PubMed
Summary

Artificial RING fingers (ARFs) were engineered to specifically detect ubiquitin-conjugating enzyme (E2) activities. Mutated ARFs precisely identify E2s, offering new tools for studying diseases linked to ubiquitination.

Keywords:
artificial RING fingersubiquitin ligating enzymeubiquitin-conjugating enzymeubiquitination

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Ubiquitin (Ub)-conjugating enzymes (E2s) are crucial in transferring Ub from E1 enzymes to substrates.
  • E2 enzyme dysfunction is implicated in various cancers and neurological disorders.
  • Understanding E2 enzyme activity is vital for disease research.

Purpose of the Study:

  • To investigate the E2-binding and auto-ubiquitination properties of artificial RING fingers (ARFs).
  • To develop a tool for specific detection of E2 enzyme activities.
  • To explore the role of specific mutations in modulating ARF ubiquitination function.

Main Methods:

  • Ubiquitination assays were employed to study ARF properties.
  • Circular dichroism spectroscopy was used to analyze ARF structures.
  • Site-directed mutagenesis (PKLTC to Trp) was performed on ARFs to assess functional changes.

Main Results:

  • Mutated ARFs exhibited altered E2 specificity and ubiquitination patterns (mono- and polyubiquitination).
  • The introduced Tryptophan residue acted as a key determinant for altered ubiquitination activity via E2 binding.
  • ARF mutants successfully interacted with all tested E2 enzymes and promoted auto-ubiquitination.

Conclusions:

  • Engineered ARFs, particularly mutants, can specifically detect E2 enzyme activities.
  • This study provides a novel approach for researching E2 enzymes in the context of fatal diseases.
  • The findings open new avenues for diagnostic and therapeutic strategies targeting ubiquitination pathways.