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Related Concept Videos

Peptide Bonds02:43

Peptide Bonds

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A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
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Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
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The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’...
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An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with...
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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Related Experiment Video

Updated: May 29, 2025

Split-and-pool Synthesis and Characterization of Peptide Tertiary Amide Library
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Split-and-pool Synthesis and Characterization of Peptide Tertiary Amide Library

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Synergistic anion-π interactions in peptidomimetic polyethers.

Seunghyun Lee1, Aram Shin2, Jinwoo Park1

  • 1School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea.

Proceedings of the National Academy of Sciences of the United States of America
|February 5, 2025
PubMed
Summary

This study explores anion-π interactions in synthetic polymers inspired by mussel proteins. Researchers found that specific polymer designs effectively utilize these interactions, showing potential for new functional materials.

Keywords:
anionic ring-opening polymerizationanion–π interactionpeptidomimetic polyetherspolymer cohesionsurface forces apparatus

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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
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Facile Protocol for the Synthesis of Self-assembling Polyamine-based Peptide Amphiphiles PPAs and Related Biomaterials
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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
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Facile Protocol for the Synthesis of Self-assembling Polyamine-based Peptide Amphiphiles PPAs and Related Biomaterials
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Facile Protocol for the Synthesis of Self-assembling Polyamine-based Peptide Amphiphiles PPAs and Related Biomaterials

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Area of Science:

  • Polymer Chemistry
  • Supramolecular Chemistry
  • Biomaterials Science

Background:

  • Anion-π interactions are vital in biological systems like enzyme catalysis and ion transport.
  • Exploiting anion-π interactions in synthetic polymers is an emerging area with significant potential.
  • Mussel foot proteins provide a natural blueprint for designing materials with specific adhesive and interactive properties.

Purpose of the Study:

  • To investigate and quantify anion-π interactions in synthetic polymer systems.
  • To design and synthesize novel polyether-based polymers mimicking key amino acids found in mussel foot proteins.
  • To understand the influence of monomer composition and pH on anion-π interaction strength.

Main Methods:

  • Synthesis of polyether-based polymers using catechol acetonide glycidyl ether and 4,4-dimethyl-2-oxazoline glycidyl ether monomers.
  • Utilizing a surface forces apparatus to measure cohesion energy and probe anion-π interactions.
  • Systematic variation of monomer composition and pH conditions during experiments.
  • Control experiments with modified polymer structures and competing anions to confirm interaction mechanisms.

Main Results:

  • Maximum cohesion energy of 15.0 mJ/m² achieved at equimolar monomer composition and neutral pH (pH 7).
  • Demonstrated the dominant role of anion-π interactions through structural modifications and competitive anion studies.
  • Successfully mimicked biological interactions using synthetic peptidomimetics.

Conclusions:

  • Anion-π interactions can be effectively harnessed in synthetic polymer systems.
  • The designed peptidomimetic polymers show significant potential for creating advanced functional materials.
  • This research opens new avenues for bio-inspired material design utilizing specific non-covalent interactions.