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Title: Water Ordering Controls the Dynamic Equilibrium of Micelle-Fiber Formation in Self-Assembly of Peptide Amphiphiles

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms12367· OSTI ID:1339526
 [1];  [1];  [2];  [1];  [1]
  1. Argonne National Lab. (ANL), Lemont, IL (United States)
  2. Univ. of Missouri, Columbia, MO (United States)

Understanding the role of water in governing the kinetics of the self-assembly processes of amphiphilic peptides has still remained elusive. Here, using a multi-stage atomistic-coarse-grained approach, complemented by circular dichroism/infra-red spectroscopy and dynamic light scattering experiments, we highlight the dual nature of water in dictating the mechanism and dynamics of self-assembly of peptide amphiphiles (PAs). Our computational study shows that (i) Water cage formation and breakage near the hydrophobic groups controls the fusion dynamics and aggregation of PAs in the micellar stage, and (ii) Enhanced structural ordering of vicinal water near the hydrophilic amino acids shifts the equilibrium towards the fiber phase and stimulates structure and order in the PAs when they assemble into a hexagonal nanofiber architecture. Finally, spectroscopy and microscopy studies authenticate our computational observation that water ordering near the PAs increases with increase in time. The measured infra-red O-H bond stretch frequency reminiscent of ice-like suggests that the solvated water becomes increasingly solid-like with increased structural order in the assembled peptide network – thus shedding light on the role of water in a self-assembly process.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1339526
Journal Information:
Nature Communications, Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 44 works
Citation information provided by
Web of Science

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Cited By (5)

Amphiphile self-assembly dynamics at the solution-solid interface reveal asymmetry in head/tail desorption journal January 2018
Solvation and hydrogen bonding aided efficient non-radiative deactivation of polar excited state of 5-aminoquinoline journal January 2018
Development of transferable coarse-grained models of amino acids journal January 2020
Dynamic light scattering studies of the effects of salts on the diffusivity of cationic and anionic cavitands journal January 2018
Supramolecular Self-Assembly To Control Structural and Biological Properties of Multicomponent Hydrogels journal September 2019

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