Decoding fold robustness and thermostability in Thermococcus AMP phosphorylase and its DPBB domains

Area of Science:

• Biochemistry and Molecular Biology
• Structural Biology
• Computational Biology

Background:

• Extreme environments pose significant challenges to protein structure and function.
• Thermophilic enzymes like Thermococcus AMP phosphorylase offer insights into protein adaptation.
• Understanding the molecular basis of thermostability is crucial for biotechnology and enzyme engineering.

Purpose of the Study:

• To investigate the molecular determinants of thermostability and fold resilience in Thermococcus AMP phosphorylase.
• To explore the role of DPBB domains in protein stability and function.
• To uncover evolutionary strategies that confer functional robustness under extreme conditions.

Main Methods:

• Multiscale simulations were employed to model protein dynamics.
• Energetic profiling was used to assess thermodynamic stability.
• Rational redesign experiments were conducted to validate computational findings.
• Comparative structural-dynamics analyses were performed across homologous proteins.

Main Results:

• Sequence divergence, rugged thermodynamics, and fold plasticity are key adaptation paradigms.
• These factors collectively contribute to enhanced thermostability and functional robustness.
• Specific insights were gained into the behavior of DPBB domains within the enzyme.

Conclusions:

• Evolutionary strategies in Thermococcus AMP phosphorylase integrate sequence, thermodynamics, and dynamics for stability.
• The findings highlight the interplay between sequence divergence and protein plasticity in extreme environments.
• This research provides a framework for understanding and engineering thermostable proteins.