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CREB SUMOylation by the E3 ligase PIAS1 enhances spatial memory
Yan-Chu Chen1, Wei-Lun Hsu2, Yun-Li Ma2
1Graduate Institute of Life Sciences, National Defense Medical Center, and.
Summary
Small ubiquitin-like modifier (SUMO) E3 ligase PIAS1 sumoylation of cAMP-responsive element binding protein (CREB) enhances CREB expression and sustains long-term memory formation. This modification, particularly in CA1 neurons, is crucial for spatial learning and memory.
Area of Science:
- Neuroscience
- Molecular Biology
- Epigenetics
Background:
- cAMP-responsive element binding protein (CREB) phosphorylation is vital for long-term memory.
- Other posttranslational modifications of CREB, like SUMOylation, are less understood.
- The short isoform CREB1Δ and its modifications are key to memory processes.
Purpose of the Study:
- To investigate the role of SUMOylation in CREB function and long-term memory.
- To identify the specific E3 ligases involved in CREB SUMOylation.
- To elucidate the impact of CREB SUMOylation on spatial learning and memory.
Main Methods:
- In vitro SUMOylation assays using PIAS1 and CREB1Δ.
- Water maze training in rats to assess spatial learning and memory.
- In vivo transduction of CREB variants and PIAS1 siRNA in rat CA1 neurons.
- Analysis of CREB DNA binding to the bdnf promoter and bdnf mRNA expression.
Main Results:
- PIAS1 sumoylation of CREB1Δ increases its expression level.
- Water maze training enhances endogenous CREB SUMOylation in rat CA1 neurons.
- CREB SUMOylation, dependent on phosphorylation, sustains long-term memory and enhances CREB DNA binding to the bdnf promoter, increasing bdnf mRNA expression.
- Knock-down of PIAS1 impairs spatial learning and memory.
Conclusions:
- SUMOylation by PIAS1 is a critical posttranslational modification of CREB.
- CREB SUMOylation plays a sustained role in long-term memory formation, complementing CREB phosphorylation's role in early signaling.
- Targeting CREB SUMOylation pathways may offer therapeutic strategies for memory disorders.
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