Nano-confinement of biomolecules: Hydrophilic confinement promotes structural order and enhances mobility of water molecules
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Molecular dynamics simulations have been used to investigate the confinement packing characteristics of small hydrophilic (N-acetyl-glycine-methylamide, Nagma) and hydrophobic (N-acetyl-leucine-methylamide, Nalma) biomolecules in large diameter single-wall carbon nanotubes (SWCNTs). We find that hydrophilic biomolecules easily fill the nanotube and self organize into a geometrical configuration which reminds the water structural organization under SWCNT confinement. The packing of hydrophilic biomolecules inside the cylinder confines all water molecules in its core, which enhances their mobility. Conversely, hydrophobic biomolecules accommodate into the nanotubes with a trend for homogeneous filling, which generate unstable small pockets of water and drive toward a state of dehydration. These results shed light on key parameters important for the encapsulation of biomolecules with direct relevance for long-term storage and prevention of degradation.
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Nano-confinement of biomolecules: Hydrophilic confinement promotes structural order and enhances mobility of water molecules
)
Abstract
Molecular dynamics simulations have been used to investigate the confinement packing characteristics of small hydrophilic (N-acetyl-glycine-methylamide, Nagma) and hydrophobic (N-acetyl-leucine-methylamide, Nalma) biomolecules in large diameter single-wall carbon nanotubes (SWCNTs). We find that hydrophilic biomolecules easily fill the nanotube and self organize into a geometrical configuration which reminds the water structural organization under SWCNT confinement. The packing of hydrophilic biomolecules inside the cylinder confines all water molecules in its core, which enhances their mobility. Conversely, hydrophobic biomolecules accommodate into the nanotubes with a trend for homogeneous filling, which generate unstable small pockets of water and drive toward a state of dehydration. These results shed light on key parameters important for the encapsulation of biomolecules with direct relevance for long-term storage and prevention of degradation.
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Acknowledgements
D. R. thanks ARC-Santé and region Rhone-Alpes (France), for financial support with the Nanofold project. D. R. is grateful to Dr. Jose Teixeira (LLB, CNRS France) and Dr. Alessandro Cunsolo for discussions and suggestions. D. R. is grateful to Dr. Scott Brown (Sunovion Pharmaceuticals, USA) for scientific discussion and to have reviewed the manuscript to improve the scientific language. B. A. gratefully acknowledges the computing resources provided on Blues and Fusion high-performance computing clusters operated by the Laboratory Computing Resource Center at Argonne National Laboratory.
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