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Published on: October 17, 2015
AβPP intracellular C-terminal domain function is related to its degradation processes
Erica Buoso1, Fabrizio Biundo, Cristina Lanni
1Department of Drug Sciences, Pharmacology Unit, Center of Excellence in Applied Biology, University of Pavia, Pavia, Italy.
Amyloid-β precursor protein (AβPP) intracellular domain (AICD) plays a role in gene regulation. Its removal involves proteasome activity and an alternative IDE-inhibitor-sensitive pathway, suggesting dual degradation mechanisms.
Area of Science:
- Cellular Biology
- Neuroscience
- Protein Biochemistry
Background:
- Amyloid-β protein precursor (AβPP) processing yields the intracellular C-terminal domain (AICD).
- AICD's role in the Fe65/Tip60 complex is linked to signal transduction.
- Discrepancies exist regarding AICD localization, function, and degradation pathways.
Purpose of the Study:
- To investigate the functional role of AICD within the Fe65/Tip60 complex.
- To analyze AICD degradation processes in relation to its nuclear activity.
- To elucidate the mechanisms governing AICD removal.
Main Methods:
- Analysis of AICD localization and function.
- Assessment of proteasome activity on AICD.
- Treatment with insulin-degrading enzyme (IDE) inhibitors.
Main Results:
- A correlation was observed between AICD's gene regulatory role and proteasome-mediated degradation.
- IDE inhibition revealed an alternative AICD removal pathway when AICD is not transcriptionally active.
- Evidence supports at least two distinct AICD degradation mechanisms.
Conclusions:
- AICD degradation is linked to its functional state (nuclear vs. non-nuclear).
- Proteasome activity is crucial for AICD removal during gene regulation.
- An alternative, IDE-sensitive pathway facilitates AICD clearance, supporting dual degradation models.
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