Allostery without a conformational change? Revisiting the paradigm

Area of Science:

• Biochemistry
• Structural Biology
• Molecular Dynamics

Background:

• Allostery classically involves functional switches via conformational changes.
• Emerging studies suggest allosteric mechanisms operate through protein dynamics.

Purpose of the Study:

• To explain that a lack of observed conformational change does not preclude its occurrence in allostery.
• To identify reasons why conformational changes in allostery may be missed by structural analysis.

Main Methods:

• Review of existing literature and structural data.
• Analysis of factors influencing the observation of conformational dynamics.
• Consideration of molecular dynamics simulations and protein quaternary structure.

Main Results:

• Structural comparisons may fail to detect allosteric conformational changes due to various factors.
• Crystallization conditions, disorder, and overlooking quaternary structure can obscure dynamics.
• Synergistic effects and insufficient simulation times also hinder detection.

Conclusions:

• Allosteric regulation can be driven by dynamics even without apparent static conformational shifts.
• Distinct protein functions arise from specific interactions between conformationally selected states.
• Further investigation into dynamic aspects of allostery is crucial.