Molecular Analysis and Conformational Dynamics of Human MC4R Disease-Causing Mutations

Area of Science:

• Genetics and Molecular Biology
• Biochemistry
• Computational Biology

Background:

• Obesity is a growing global health concern, particularly in pediatric populations.
• Melanocortin 4 receptor (MC4R) is vital for cellular homeostasis and linked to severe obesity via mutations.
• Identifying pathogenic MC4R variants is critical for managing obesity and its complications.

Purpose of the Study:

• To delineate MC4R mutations and analyze their structural impact.
• To understand how mutations affect MC4R function, including ligand binding and stability.
• To provide a molecular basis for MC4R dysfunction in obesity.

Main Methods:

• Sequence-based pathogenicity analysis of naturally occurring MC4R variants.
• Structure-based protein stability analysis using computational tools.
• Molecular dynamics (MD) simulations to assess conformational changes in wild-type and mutant MC4R.

Main Results:

• Computational analysis mapped structural variations caused by MC4R mutations.
• Active site mutations (D122N, D126Y, S188L) were analyzed for their impact on calcium and ligand binding.
• MD simulations revealed conformational changes explaining MC4R instability in certain mutations.

Conclusions:

• This research elucidates the molecular mechanisms underlying MC4R dysfunction in obesity.
• Findings offer insights for clinical intervention and drug design targeting MC4R-related obesity.
• Understanding MC4R structural dynamics is key to addressing obesity progression.