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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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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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Hydrolysis01:15

Hydrolysis

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Overview
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
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Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Polymer Classification: Stereospecificity01:26

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Conformational Selection in Enzyme-Catalyzed Depolymerization of Bio-based Polyesters.

Ximena Lopez-Lorenzo1,2, Ganapathy Ranjani1,2, Per-Olof Syrén1,2

  • 1School of Engineering Sciences in Chemistry, Biotechnology and Health, Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Stockholm, 100 44, Sweden.

Chembiochem : a European Journal of Chemical Biology
|July 22, 2024
PubMed
Summary
This summary is machine-generated.

Enzymatic degradation of biopolymers is enhanced when polymer chain conformations match enzyme active sites. This conformational selection is key to optimizing biocatalytic depolymerization for a sustainable bio-based economy.

Keywords:
Bio-based polymersBiocatalysisConformational selectionEnzymatic degradation

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Area of Science:

  • Biocatalysis and Polymer Science
  • Sustainable Chemistry
  • Biotechnology

Background:

  • Enzymatic polymer degradation is crucial for a bio-based economy, but polymer bulkiness and chain conformations hinder biocatalyst efficiency.
  • Previous work showed varying affinities of polyethylene terephthalate (PET) conformers to PETase, impacting depolymerization rates.
  • Structural-function relationships in biopolymer biocatalysis remain poorly understood.

Purpose of the Study:

  • To investigate the enzymatic biodegradation of novel bio-polyesters derived from a chiral terpene-based diol and renewable diesters.
  • To explore the correlation between polymer chain conformation, enzyme active site binding, and depolymerization efficiency.
  • To elucidate the role of conformational selection in optimizing biocatalytic degradation of biopolymers.

Main Methods:

  • Synthesis of four bio-polyesters with varying semi-aromatic to aliphatic content.
  • Enzymatic depolymerization using IsPETase S238A, Dura, and LCC enzymes.
  • Induced-fit docking (IFD) analyses to predict substrate-enzyme conformational matches.

Main Results:

  • Monomer yields from enzymatic depolymerization ranged from 2% to 17% without pre-treatment.
  • Degradation efficiency strongly correlated with the degree of conformational matching between polymer chains and enzyme active sites, as predicted by IFD.
  • This correlation held true irrespective of the reaction temperature.

Conclusions:

  • Conformational selection is a critical factor in the enzymatic depolymerization of biopolymers.
  • The specific conformation (straight or twisted) of a polymer chain significantly influences its affinity to enzyme ground-state conformers.
  • Optimizing biocatalytic degradation requires careful consideration of the conformational compatibility between the polymer substrate and the enzyme, offering insights for sustainable bioprocess development.