Systematic transition modeling analysis in the MEF2B-DNA binding interface due to Y69H and K4E variants

Area of Science:

• Molecular Biology
• Structural Biology
• Cancer Research

Background:

• Mutations in transcriptional coactivator myocyte enhancer factor 2B (MEF2B) are the primary cause of germinal center-derived B-cell non-Hodgkin lymphoma.
• The precise structure-function relationships of MEF2B mutations in lymphomagenesis remain largely uncharacterized.

Purpose of the Study:

• To structurally evaluate the impact of two MEF2B missense variants, K4E and Y69H, on DNA binding.
• To investigate the dynamic conformational changes associated with these MEF2B mutations using in silico methods.

Main Methods:

• In silico structural evaluation of MEF2B variants K4E and Y69H.
• Molecular dynamics (MD) simulations to assess DNA-binding interactions and conformational changes.
• Anisotropic Network Model (ANM) analysis to identify protein flexibility.

Main Results:

• MEF2B K4E and Y69H variants exhibit altered DNA-binding residues and dynamics compared to wild-type (WT) MEF2B.
• MEF2B K4E and Y69H show increased fluctuations in key structural regions (α1 and α3) upon DNA binding.
• The Y69H variant may have impaired p300 co-activator recruitment, potentially explaining reduced transcriptional activity.

Conclusions:

• This study provides a structural basis for DNA recognition by MEF2B, highlighting conformational dynamics in MEF2B variants.
• Understanding these structural changes offers potential for developing novel therapeutic strategies targeting MEF2B-driven lymphomagenesis.