Premium
An Insight into Structural and Mechanical Properties of Ideal‐Networked Poly(Ethylene Glycol)–Peptide Hydrogels from Molecular Dynamics Simulations
Author(s) -
Rukmani Shalini J.,
Anstine Dylan M.,
Munasinghe Aravinda,
Colina Coray M.
Publication year - 2020
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201900326
Subject(s) - self healing hydrogels , ethylene glycol , peptide , peg ratio , molecular dynamics , chemistry , biophysics , pegylation , materials science , polymer chemistry , chemical engineering , organic chemistry , computational chemistry , polyethylene glycol , biochemistry , finance , engineering , economics , biology
Simulations of local structure and interactions in stimuli‐responsive hydrogel networks at atomistic resolution has the capability to compliment experimental efforts by providing insight into current soft materials design challenges. This work simulates ideal hexafunctional networks of poly(ethylene glycol) (PEG)‐diacrylate (PEGDA) and PEG–peptide hydrogels with two enzyme‐responsive peptide sequences, Gly‐Leu‐Lys (GLK) and Gly‐Pro‐Gln‐Gly‐Ile‐Phe‐Gly‐Gln‐Lys (GPQGIFGQK), using molecular dynamics (MD) simulations at water contents from 84% to 90%. This presents the first atomistic MD study of a PEG–peptide hydrogel. The mesh sizes obtained are compared to common swelling theories and the available micropore space for diffusion is compared to the sizes of a family of matrix metalloproteinases (MMPs) to predict size‐based exclusion. The effects of interactions between PEG, peptide, and water on the chemical environment surrounding the cleaving site of peptides are investigated by examining partial radial distribution functions and solvent accessible surface areas. The chemical environment around the peptide sequence is found to be more hydrophobic in PEG‐9‐peptide hydrogels, thereby favoring cleavage by the hydrophobic binding pocket of MMPs. Furthermore, the mechanical moduli of the hydrogels is also examined, and an increase with the incorporation of peptide sequences and a general decrease with increasing water concentration is observed.