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Updated: Aug 5, 2026
09:45
In Vitro SUMOylation Assay to Study SUMO E3 Ligase Activity
Published on: January 29, 2018
An Acetylation-Primed SUMOylation Switch Controls RORβ Stability through a p300-SIRT1 Regulatory Axis
Research Square
|August 1, 2026
Summary
New research reveals how p300 and SIRT1 regulate Retinoic acid receptor-related orphan receptor beta (RORβ) stability. This finding offers insights into controlling RORβ for neurological, retinal, and bone disorders.
Area of Science:
- Molecular Biology
- Neuroscience
- Endocrinology
Background:
- Retinoic acid receptor-related orphan receptor beta (RORβ) is a key transcription factor.
- RORβ regulates critical functions including circadian rhythms, retinal neurogenesis, and inflammatory signaling.
- Mechanisms controlling RORβ stability are not well understood.
Purpose of the Study:
- To identify the post-translational modifications governing RORβ stability and activity.
- To elucidate the roles of p300 and SIRT1 in RORβ regulation.
- To provide a mechanistic framework for therapeutic targeting of RORβ.
Main Methods:
- Investigated the interaction between RORβ, p300, and SIRT1.
- Utilized acetylation and SUMOylation assays.
- Assessed RORβ protein levels and transcriptional activity.
Main Results:
- p300-mediated acetylation enhances RORβ abundance.
- SIRT1 regulates RORβ turnover via catalytic and scaffolding functions.
- Acetylation at K176 facilitates SUMOylation at K179, leading to proteasomal degradation and reduced RORβ activity.
Conclusions:
- A novel regulatory axis involving p300 and SIRT1 controls RORβ stability and function.
- Specific acetylation and SUMOylation events dictate RORβ degradation.
- This provides a mechanistic basis for targeting RORβ in relevant diseases.
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