Conformational sampling of CMT-2D associated GlyRS mutations.

Area of Science:

• Biochemistry
• Molecular Biology
• Genetics

Background:

• Aminoacyl-tRNA synthetases are crucial for protein synthesis, linking amino acids to tRNAs.
• Mutations in glycyl-tRNA synthetase (GlyRS) cause Charcot-Marie-Tooth disease type 2D (CMT-2D), a neurological disorder.
• Previous studies identified potential disease mechanisms but lacked atomic structural data for CMT-2D mutations.

Purpose of the Study:

• To investigate the structural and dynamic consequences of a CMT-2D-associated mutation (G240R) in GlyRS using molecular dynamics simulations.
• To identify potential common molecular mechanisms underlying GlyRS-related CMT-2D pathologies.
• To predict the effects of other reported CMT-2D mutations on GlyRS structure and dynamics.

Main Methods:

• Molecular dynamics (MD) simulations were employed to study GlyRS conformational changes.
• The G240R mutation within the dimer interface was specifically analyzed.
• Simulations were used to predict the impact of other CMT-2D mutations.

Main Results:

• The G240R mutation was found to disrupt native interactions at the GlyRS dimer interface.
• Altered dynamics were observed in regions critical for tRNA binding.
• A specific structural region was identified as potentially disrupted by multiple CMT-2D mutations.

Conclusions:

• Structural and dynamic alterations in GlyRS, particularly at the dimer interface and tRNA-binding regions, are implicated in CMT-2D.
• The identified structural region may represent a common pathogenic site for various CMT-2D mutations.
• Computational simulations provide valuable atomistic insights into GlyRS function and disease mechanisms.