Operation of Kelvin Effect in the Activities of an Antifreeze Protein: A Molecular Dynamics Simulation Study

The Journal of Physical Chemistry. B
Uday Sankar Midya, Sanjoy Bandyopadhyay

Abstract

Ice growth and melting inhibition activities of antifreeze proteins (AFPs) are better explained by the adsorption-inhibition mechanism. Inhibition occurs as a result of the Kelvin effect induced by adsorbed protein molecules onto the surface of seed ice crystal. However, the Kelvin effect has not been explored by the state-of-the-art experimental techniques. In this work, atomistic molecular dynamics simulations have been carried out with Tenebrio molitor antifreeze protein ( TmAFP) placed at ice-water interface to probe the Kelvin effect in the mechanism of AFPs. Simulations show that, below equilibrium melting temperature, ice growth is inhibited through the convex ice-water interface formation toward the water phase and, above equilibrium melting temperature, ice melting is inhibited through the concave ice-water interface formation inward to ice phase. Simulations further reveal that the radius of curvature of the interface formed to stop the ice growth increases with decrease in the degree of supercooling. Our results are in qualitative agreement with the theoretical prediction of the Kelvin effect and thus reveal its operation in the activities of AFPs.

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Citations

Oct 20, 2019·International Journal of Molecular Sciences·Romà Surís-Valls, Ilja K Voets
Sep 18, 2018·The Journal of Physical Chemistry. B·Uday Sankar Midya, Sanjoy Bandyopadhyay
Sep 30, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Julian Gerhäuser, Volker Gaukel

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