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Related Experiment Video

Updated: Sep 29, 2025

Transmembrane Domain Oligomerization Propensity determined by ToxR Assay

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Published on: May 26, 2011

Generalizing the Aromatic δ-Amino Acid Foldamer Helix.

Daniel Bindl¹, Pradeep K Mandal¹, Ivan Huc¹

¹Department of Pharmacy and Center for Integrated Protein Science, Ludwig-Maximilians-Universität, Butenandtstraße 5-13, München, 81377, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|March 25, 2022

Summary

Aromatic oligoamide foldamers adopt a stable helical structure, with stability influenced by the balance of rigid and flexible units. This research offers insights into fine-tuning foldamer properties for specific applications.

Keywords:

delta-peptides foldamers helical conformation structure elucidation x-ray crystallography

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Area of Science:

* Organic Chemistry
* Polymer Science
* Supramolecular Chemistry

Background:

* Foldamers are synthetic oligomers mimicking protein secondary structures.
* Aromatic foldamers offer unique structural and functional properties.
* Understanding foldamer folding is crucial for designing novel materials.

Purpose of the Study:

* To synthesize and characterize aromatic oligoamide foldamers with varying flexibility.
* To investigate the factors influencing the helical stability and structure of these foldamers.
* To explore the potential for fine-tuning foldamer properties through monomer selection and arrangement.

Main Methods:

* Synthesis of aromatic oligoamide foldamer sequences using quinoline, pyridine, and benzene-derived δ-amino acids.
* Structural analysis using X-ray crystallography for key sequences.
* Spectroscopic characterization including 1H NMR in aqueous solutions.

Main Results:

* A canonical aromatic helix fold was observed in most synthesized sequences.
* Helix stability was found to be critically dependent on the ratio of rigid to flexible units.
* Variations in curvature and tolerance for sp3 centers were noted, demonstrating the general nature of the aromatic δ-peptide helix.
* Canonical helical folding was achieved by alternating specific monomers, even when they did not fold independently.

Conclusions:

* Aromatic δ-peptide helices are general and adaptable structures.
* The stability, curvature, and kinetics of foldamers can be precisely controlled by adjusting the proportion of rigid and flexible units.
* Systematic combination of compatible δ-amino acids allows for fine-tuning of foldamer properties, including helix handedness and side chain positioning.