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Related Concept Videos

Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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ATP and Macromolecule Synthesis01:28

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Biological macromolecules are organic compounds, predominantly composed of carbon atoms. The carbon atoms are covalently bonded with hydrogen, oxygen, nitrogen, and other minor elements. There are four major biological macromolecule classes: carbohydrates, lipids, proteins, and nucleic acids.
Most macromolecules are composed of single subunits, or building blocks, called monomers. The monomers combine with each other using covalent bonds to form larger molecules known as polymers.
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Step-Growth Polymerization: Overview01:03

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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Anionic Chain-Growth Polymerization: Overview01:20

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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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Anionic Chain-Growth Polymerization: Mechanism01:04

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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OaAEP1-Mediated Enzymatic Synthesis and Immobilization of Polymerized Protein for Single-Molecule Force Spectroscopy
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One-Step Protein-Polymer Conjugates from Boronic-Acid-Functionalized Polymers.

Michael J Swierczynski1, Zachary T Ball1

  • 1Department of Chemistry, Rice University, 6100 Main Street, Bioscience Research Collaborative, Houston, Texas 77005, United States.

Bioconjugate Chemistry
|October 20, 2020
PubMed
Summary

This study introduces a straightforward nickel-catalyzed method for creating polymer-protein conjugates using polymer-boronic acids and cysteine residues. This approach enables the synthesis of novel hybrid materials with tunable properties.

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Area of Science:

  • Bioconjugation Chemistry
  • Materials Science
  • Polymer Chemistry

Background:

  • Polymer-protein conjugates are hybrid materials with valuable properties.
  • Traditional bioconjugation methods face challenges with complex and large reagents.
  • Nontraditional methods like metal-catalyzed arylation are being explored for polymer-protein conjugation.

Purpose of the Study:

  • To demonstrate a simple and effective method for synthesizing polymer-protein conjugates.
  • To utilize metal-catalyzed arylation for creating diblock polymer-protein materials.
  • To explore the molecular and physical properties of the resulting hybrid structures.

Main Methods:

  • Nickel(II)-promoted arylation reaction.
  • Conjugation of end-functionalized polymer-boronic acids to cysteine residues on proteins.
  • Characterization of the synthesized polymer-protein conjugates.

Main Results:

  • Successful synthesis of polymer-protein conjugates via Ni(II)-catalyzed arylation.
  • Demonstration of a simple and efficient bioconjugation strategy.
  • Exploration of the molecular and physical characteristics of the novel hybrid materials.

Conclusions:

  • Nickel-catalyzed arylation provides a viable route for creating complex polymer-protein conjugates.
  • This method offers a versatile approach to designing novel hybrid materials.
  • The developed technique expands the toolkit for bioconjugation and materials science.