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Decoding Allostery: How Interactions Lock S100B Conformations and What K55A Mutation Teaches Us.

Riya Samanta^1,2, Xinhao Zhuang³, Manuel Gondolesi⁴

¹Biophysics Graduate Program, University of Maryland, College Park, Maryland 20742, United States.

Journal of Chemical Information and Modeling

|November 21, 2025

Summary

This summary is machine-generated.

Dynamic allostery in S100B proteins is crucial for biological systems. TRTK binding to S100B enhances calcium (Ca2+) binding by altering subunit interactions, a process investigated via mutagenesis and simulations.

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Area of Science:

Biochemistry
Structural Biology
Protein Dynamics

Background:

Allostery, or action at a distance, is a fundamental biological mechanism.
Dynamic allostery, distinct from conformational changes, governs protein function.
S100B, a calcium-binding protein, serves as a model for studying dynamic allostery, particularly its interaction with TRTK.

Purpose of the Study:

To investigate the role of inter- and intra-subunit interactions in S100B's dynamic allostery.
To explore how TRTK binding enhances calcium (Ca2+) binding affinity in S100B.
To elucidate the molecular mechanisms underlying TRTK-mediated allosteric effects in S100B.

Main Methods:

Site-directed mutagenesis (K55A) to disrupt specific protein interactions.
Nuclear Magnetic Resonance (NMR) spectroscopy to assess conformational and thermodynamic properties.
Molecular Dynamics (MD) simulations to model protein behavior and information transmission.
Network science tools to quantify information flow within the protein system.

Main Results:

MD simulations suggest that in the K55A mutant, inter/intra-subunit interactions are disrupted, enhancing Ca2+ binding affinity.
TRTK binding to S100B enhances Ca2+ binding at a distal site.
Mutagenesis and simulation data indicate that altered electrostatic and hydrophobic interactions contribute to enhanced Ca2+ binding.

Conclusions:

The study elucidates the mechanism of dynamic allostery in S100B, highlighting the role of disrupted inter/intra-subunit interactions.
Findings support the hypothesis that TRTK binding allosterically modulates S100B's Ca2+ binding affinity.
Combined NMR and MD simulation approaches provide robust evidence for the proposed allosteric mechanism.