Computational Investigation on Electrostatic Loop Mutants Instigating Destabilization and Aggregation on Human SOD1...

Area of Science:

• Neuroscience
• Molecular Biology
• Biochemistry

Background:

• Mutations in the Cu/Zn Superoxide Dismutase 1 (SOD1) gene are a significant cause of Amyotrophic Lateral Sclerosis (ALS).
• These mutations often lead to protein misfolding, aggregation, and destabilization, contributing to neurodegeneration.

Purpose of the Study:

• To systematically investigate the impact of mutations in the SOD1 protein's electrostatic loop.
• To identify specific mutations that cause protein destabilization, misfolding, and aggregation.

Main Methods:

• Utilized thermodynamical studies and discrete molecular dynamics (DMD) simulations.
• Analyzed secondary structural propensities and free energy landscapes.

Main Results:

• Identified L126S, N139H, and G141A mutations as the most destabilizing and disease-causing among those studied.
• These specific mutants showed increased propensity for SOD1 aggregation compared to other variants.

Conclusions:

• The findings provide insights into the molecular mechanisms by which SOD1 mutations contribute to ALS.
• Highlights L126S, N139H, and G141A as key mutants in SOD1-linked neurodegeneration.