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Updated: Sep 1, 2025
06:06
In Vitro Analysis of E3 Ubiquitin Ligase Function
Published on: May 14, 2021
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A context-dependent and disordered ubiquitin-binding motif.
Jesper E Dreier1,2, Andreas Prestel1, João M Martins3
1Structural Biology and NMR Laboratory, University of Copenhagen, Ole Maaloes Vej 5, 2200, Copenhagen N, Denmark.
Cellular and Molecular Life Sciences : CMLS
|August 16, 2022
Summary
Researchers discovered a new Disordered Ubiquitin-Binding Motif (DisUBM) that binds ubiquitin without folding. This motif expands the known ways proteins recognize ubiquitylation, impacting degradation and transcription processes.
Area of Science:
- Biochemistry
- Molecular Biology
- Structural Biology
Background:
- Ubiquitin conjugation is a key posttranslational modification.
- Folded protein domains typically recognize ubiquitin.
- Previous studies suggested protein regions might fold upon binding ubiquitin.
Purpose of the Study:
- To identify and characterize novel ubiquitin-binding motifs.
- To expand the known repertoire of ubiquitin-binding proteins.
- To understand the biophysical basis of disordered ubiquitin recognition.
Main Methods:
- Peptide binding arrays
- Bioinformatics analysis
- NMR spectroscopy
- De novo peptide library screening
Main Results:
- A novel Disordered Ubiquitin-Binding Motif (DisUBM) was identified.
- DisUBMs remain disordered upon ubiquitin binding.
- The motif's binding relies on aromatic and charged residues, not fixed positions.
- Binding affinity is low but enhanced by the surrounding disordered protein chain.
- DisUBMs are found in proteins involved in degradation and transcription.
Conclusions:
- DisUBMs represent a new class of ubiquitin-binding elements.
- These motifs expand the mechanisms for translating ubiquitylation signals.
- Disordered ubiquitin-binding motifs can function as affinity enhancers in intrinsically disordered proteins.
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