Unveiling the adaptive structure-function synergy in thermophilic translation initiation factor 1: A molecular...

Area of Science:

• Molecular biology
• Biophysics
• Structural biology

Background:

• Thermophilic bacteria possess unique adaptations for efficient translation at high temperatures.
• Initiation Factor 1 (IF1) is crucial for ribosomal interactions and start codon recognition.
• The molecular basis for IF1's thermal resilience remains unclear.

Purpose of the Study:

• To investigate the atomistic basis of thermal adaptation in IF1 from Thermoanaerobacterium thermosaccharolyticum (TT_IF1).
• To compare the dynamic properties of TT_IF1 with its mesophilic counterpart (FK_IF1).

Main Methods:

• Extensive molecular dynamics simulations (1000 ns, triplicate).
• Analysis of dynamic properties, structural rigidity, and residue-level flexibility.
• Principal component analysis to assess conformational fluctuations.

Main Results:

• TT_IF1 exhibits enhanced structural rigidity due to increased hydrogen bonds and salt bridges.
• Restricted conformational fluctuations in TT_IF1 suggest optimization against entropy-driven destabilization.
• TT_IF1 balances stability and plasticity for ribosomal RNA interaction and thermal resistance.

Conclusions:

• Mechanistic insights into the molecular strategies for thermophilic adaptation of translation initiation factors.
• Provides a framework for engineering thermostable proteins for synthetic and industrial biotechnology.