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Updated: Oct 7, 2025
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Co-immunoprecipitation Assay for Studying Functional Interactions Between Receptors and Enzymes
Published on: September 28, 2018
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PEA-15 engages in allosteric interactions using a common scaffold in a phosphorylation-dependent manner
Joyce Ikedife1, Jianlin He2, Yufeng Wei3
1Department of Chemistry, New Jersey City University, Jersey City, NJ, 07305, USA.
Scientific Reports
|January 8, 2022
Summary
Phosphorylation of PEA-15 protein alters its binding from ERK to FADD. This shift is crucial for assembling the death-inducing signaling complex (DISC) and regulating apoptosis pathways.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Signaling
Background:
- Phosphoprotein enriched in astrocytes, 15 kDa (PEA-15) regulates MAPK and apoptosis pathways.
- PEA-15 contains a death-effector domain (DED) crucial for protein interactions.
Purpose of the Study:
- To investigate the allosteric effects of PEA-15 C-terminal tail phosphorylation on DED conformation and binding specificity.
- To determine how phosphorylation at Ser-104 and Ser-116 influences PEA-15 interactions with ERK and FADD.
Main Methods:
- Molecular dynamics simulations were employed to study PEA-15 interactions.
- Analysis of binding interfaces and conformational changes upon phosphorylation.
Main Results:
- Unphosphorylated PEA-15 binds ERK2, while doubly phosphorylated PEA-15 binds FADD.
- Phosphorylated Ser-116 forms electrostatic interactions with FADD DED.
- PEA-15 binding induces conformational changes in FADD, facilitating DISC assembly.
Conclusions:
- PEA-15 phosphorylation acts as a molecular switch, altering its binding partners and downstream signaling.
- These findings elucidate a key regulatory mechanism in apoptosis.
- The study provides insights into the structural basis of DISC formation.
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