Conformational flexibility and rotational binding shifts in W104C mutant MECP2-DNA complexes: A molecular simulation...

Area of Science:

• Epigenetics
• Molecular Biology
• Genetics

Background:

• Methyl-CpG-binding domain (MBD) proteins are key epigenetic regulators.
• These proteins are implicated in neurodevelopmental disorders (e.g., Rett Syndrome, Autism Spectrum Disorder) and cancers.
• The MBD superfamily includes eleven members, with MECP2 being a critical focus.

Purpose of the Study:

• To identify the most detrimental mutation within MBD proteins.
• To investigate the structural and functional impact of mutations on MECP2.
• To understand the molecular basis of MBD protein dysfunction in disease.

Main Methods:

• Sequence-based and structure-based analyses were employed.
• Structure prediction and stereochemical evaluation were performed.
• All-atom molecular dynamics simulations (500 ns) and molecular docking were utilized.

Main Results:

• The W104C mutation in MECP2 was identified as the most damaging alteration.
• Molecular dynamics revealed structural divergence, decreased DNA-binding efficacy, and solvent exposure in the W104C mutant.
• The mutation impairs hydrogen bond activity, alters binding energies, and modifies electrostatic interactions with DNA.

Conclusions:

• The W104C mutation destabilizes MECP2's DNA binding through conformational changes and altered electrostatic interactions.
• This disruption of MECP2 function can lead to neurodevelopmental disorders, particularly Rett syndrome.
• Further experimental validation of the W104C mutation's impact is warranted.