Towards the understanding of halogenation in peptide hydrogels: a quantum chemical approach

Tom Bettens, Valentin Lacanau, Ruben Van Lommel, De Maeseneer Tess, Wouter René Vandeplassche, Jolien Bertouille, Joost Brancart, Thomas Barlow, Tatiana Marianne Woller, Niko Van den Brande, Paula Moldenaers, Frank De Proft, Annemieke Madder, Richard Hoogenboom, Charlotte Martin, Steven Ballet, Mercedes Alonso Giner

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
30 Downloads (Pure)

Abstract

Non-covalent interactions involving aromatic rings play a central role in many areas of modern chemistry. In medicinal and bioorganic chemistry, the intermolecular interactions between the aromatic side chains of amino acids, such as phenylalanine and tyrosine, are of great interest. To enhance the affinity between such aromatic side chains, halogenation is a promising modification strategy. In the current work, the nature and strength of halogenated p-p stacked phenylalanine (Phe) dimers have been investigated using density functional theory, energy decomposition analyses and the non-covalent interaction (NCI) method. Our analysis shows that increasing the degree of halogenation enhances the strength of the stacking interactions and, moreover, the heavier halides (Cl, Br and I) lead to stronger interactions compared to the lighter F. This effect was traced back to local secondary interactions of the halide with the aliphatic C-H bonds of the phenylalanine side chain. Based on the computational findings, a set of peptide hydrogelators was synthesized, and the resulting hydrogel properties were further investigated via dynamic rheometry. Experimental observations can be correlated to the trends found in the theoretical analysis, suggesting that local interactions indeed play a noticeable role in enhancing peptide-based hydrogel strength. This journal is

Original languageEnglish
Pages (from-to)4792-4803
Number of pages12
JournalMaterials Advances
Volume2
Issue number14
DOIs
Publication statusPublished - 21 Jul 2021

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