The influence of a type III antifreeze protein and its mutants on methane hydrate adsorption–inhibition: a molecular dynamics simulation study

Literature Information

Publication Date 2019-08-31
DOI 10.1039/C9CP03833G
Impact Factor 3.676
Authors

Mitra Maddah, Mina Maddah, Kiana Peyvandi


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Abstract

Antifreeze proteins (AFPs) inhibit ice growth in various organisms at subzero temperature. Recently, AFPs as a hydrate inhibitor have been a topic of intense discussion, while the detailed mechanism remains obscure. The present work aims to explore molecular insight into the adsorption and inhibition of an AFP III on methane hydrate. Three polar, hydrophilic, and neutral amino acids (Asn14, Thr18, and Gln44) are mutated to elucidate the molecular mechanism of AFP III antifreeze activity. Another triple mutation is also designed to investigate the effect of the side chain. Atomistic molecular dynamics simulations provide detailed structural and dynamical aspects of protein residues and water molecules at the hydrate/water interface. Initially, it was proposed that the AFP III operates by the adsorption–inhibition mechanism on hydrates, almost similar to that of ice. The exchange of amide and hydroxyl groups by mutagenesis alters the shape of the side chain and the capability of hydrogen bonding and demonstrates that hydrogen bonds are not directly responsible for the AFP III antifreeze activity. Moreover, we deciphered that the length of the pendant group is an important factor in the entrapment of the AFP III on the hydrate cages, which is compatible with van der Waals interactions between the side chains and hydrate surface. The results suggest that this interaction is sensitive to the geometry and shape of the hydrate-binding surface (HBS) of the AFP, which implies that the interface between hydrates and the AFP is relatively rigid.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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