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Related Concept Videos

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Structure of Conjugated Dienes

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Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
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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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Conjugated Proteins

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Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
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One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme “pump” embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
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Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering
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Secondary Structure-Driven Hydrogelation Using Foldable Telechelic Polymer-Peptide Conjugates.

Ronja Otter1, Nina Alexandra Henke1, Christian Berac1

  • 1Institute of Organic Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, D-55128, Mainz, Germany.

Macromolecular Rapid Communications
|July 25, 2018
PubMed
Summary
This summary is machine-generated.

Researchers synthesized polymer-peptide conjugates that form pH-switchable nanorods and hydrogels. This highlights how molecular interactions control self-assembly for advanced nanomaterials.

Keywords:
hydrogelspeptide conjugationstimulus-responsivesupramolecular polymersβ-sheets

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Area of Science:

  • Polymer Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Polymer-peptide conjugates offer tunable properties by combining synthetic polymers with biomolecular recognition.
  • Self-assembly of peptides into ordered structures is crucial for developing functional nanomaterials.
  • Controlling self-assembly at the nanoscale is key to designing materials with specific macroscopic properties, such as hydrogels.

Purpose of the Study:

  • To synthesize ABA and ABA' triblock polymer-peptide conjugates.
  • To investigate the pH-switchable self-assembly behavior of phenylalanine-histidine (FHFHF) peptides.
  • To explore the formation of nanostructures and hydrogels driven by supramolecular interactions.

Main Methods:

  • Synthesis of polyethylene glycol- and polysarcosine-based triblock polymer-peptide conjugates.
  • Characterization of peptide self-assembly using techniques to observe nanorod formation.
  • Investigation of hydrogelation triggered by specific peptide folding and assembly.

Main Results:

  • Successful synthesis of ABA and ABA' triblock polymer-peptide conjugates.
  • Demonstration of pH-switchable β-sheet self-assembly of FHFHF peptides into nanorods in aqueous solution.
  • Observation that only parallel β-sheet-driven assembly in ABA triblock conjugates leads to interstrand cross-linking and hydrogel formation.

Conclusions:

  • The study demonstrates the successful synthesis of novel polymer-peptide conjugates.
  • Parallel β-sheet-driven self-assembly is critical for hydrogelation, underscoring the role of supramolecular interactions.
  • These findings highlight the potential for designing advanced nanomaterials through controlled self-assembly.