An Exploration of Multiple Component Peptide Assemblies by Enzyme-Instructed Self-Assembly

Area of Science:

• Biochemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Protein crystal structures of Merlin (M) and CRL4DCAF-1 (D) reveal key motifs.
• Understanding enzyme-instructed self-assembly (EISA) is crucial for developing novel biomaterials.

Purpose of the Study:

• To investigate the EISA of a novel phosphopeptide (1P) derived from Merlin motifs.
• To examine the influence of the CRL4DCAF-1 peptide (D) on the hydrogel formation of 1P.
• To compare the EISA behavior of 1P with its diastereomer (2P) and enantiomer (3P).

Main Methods:

• Phosphorylation of a tyrosine residue in motif M and conjugation to a self-assembling motif to create phosphopeptide 1P.
• Enzyme-instructed self-assembly (EISA) experiments of 1P, with and without peptide 4 (derived from D).
• Circular dichroism (CD) spectroscopy to analyze the structural changes during self-assembly.

Main Results:

• EISA of 1P forms a hydrogel at an exceptionally low volume fraction (~0.03%), even in the presence of peptide 4.
• Diastereomer 2P and enantiomer 3P require significantly higher concentrations (4x and 3x, respectively) to form hydrogels via EISA.
• CD spectra indicate that phosphopeptide concentration affects CD signals, which are modulated by the interaction between M and D motifs.

Conclusions:

• The study demonstrates the efficient hydrogel formation of phosphopeptide 1P through EISA at low concentrations.
• The findings highlight the role of specific intermolecular interactions and enzymatic reactions in multi-component hydrogel formation.
• This research provides insights into designing self-assembling systems for advanced biomaterials.