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TAB1 binding induced p38α conformation change: an accelerated molecular dynamics simulation study.
Yongjian Zang1, He Wang1, Ying Kang1
1MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi'an 710049, China. yzws-123@xjtu.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|April 20, 2022
Summary
TGFβ-activated kinase 1 binding protein 1 (TAB1) binding induces p38α kinase autophosphorylation in myocardial ischemia. Understanding these conformational changes aids in developing targeted p38α inhibitors for ischemic injury treatment.
Area of Science:
- Biochemistry
- Molecular Biology
- Cardiovascular Research
Background:
- p38α mitogen-activated protein kinase (MAPK) plays a crucial role in cellular responses, including those in myocardial ischemia.
- Autophosphorylation of p38α is a key regulatory step, often influenced by binding partners like TGFβ-activated kinase 1 binding protein 1 (TAB1).
- Understanding the structural dynamics of p38α during TAB1-induced activation is vital for developing therapeutic strategies against myocardial ischemia.
Purpose of the Study:
- To investigate the conformational transformations of p38α upon TAB1 binding using advanced computational methods.
- To characterize the structural basis of p38α autophosphorylation induced by TAB1.
- To identify potential targets for selective p38α inhibitors to treat myocardial ischemia.
Main Methods:
- All-atom accelerated molecular dynamics (MD) simulations were employed to model p38α-TAB1 interactions.
- Principal component analysis (PCA) was utilized to analyze the large-scale conformational changes observed in the MD simulations.
- Key structural elements, including the activation loop (A-loop) and helical regions, were examined for dynamic alterations.
Main Results:
- TAB1 binding induced significant conformational changes in p38α, characterized by the repositioning of the A-loop.
- A novel intermediate state of p38α with an extended and phosphorylated A-loop was identified.
- TAB1 binding enhanced intramolecular correlations within p38α, particularly involving the A-loop, αC helix, and L16-loop, with phosphorylation further strengthening these interactions.
Conclusions:
- The study elucidates the molecular mechanisms underlying TAB1-mediated p38α autophosphorylation and conformational changes.
- The findings provide insights into the regulation of kinase activity and allosteric communication within p38α.
- This research facilitates the design of selective p38α inhibitors for therapeutic intervention in myocardial ischemia and related conditions.
