Frustration-induced protein intrinsic disorder

Area of Science:

• Biophysics
• Structural Biology
• Protein Dynamics

Background:

• Protein folding into native structures is crucial for biological function, often explained by energy landscapes and minimum frustration.
• While frustration typically implies disorder, recent research suggests a role in allosteric regulation and protein function.

Purpose of the Study:

• To investigate the functional role of structural frustration in inducing protein intrinsic disorder and its impact on coupled folding and binding.
• To explore how designed structural frustration influences protein-ligand interactions and regulatory functions.

Main Methods:

• Extended the Wako-Saitô-Muñoz-Eaton model to incorporate frustration effects.
• Theoretically analyzed the binding domain of neuron-restrictive silencer factor to assess designed structural frustration.

Main Results:

• Designed structural frustration was shown to induce intrinsic disorder in the analyzed protein segment.
• Demonstrated that protein folding and binding are cooperative processes.
• Observed that cooperativity leads to a sharp, switch-like folding response in intrinsically disordered proteins.

Conclusions:

• Structural frustration can be a key factor in protein intrinsic disorder and function.
• The switch-like folding response mediated by cooperativity may play a role in regulating interprotein interactions.
• Functional frustration offers new insights into protein regulatory mechanisms.