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Catalytically Perfect Enzymes01:07

Catalytically Perfect Enzymes

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The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.
 
Most enzymes...
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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
Complex carbohydrates can be broken down by breaking the bonds between individual sugar units. The reaction breaks a glycosidic bond as water is added to the compound. The...
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Related Experiment Video

Updated: Sep 19, 2025

Protein WISDOM: A Workbench for In silico De novo Design of BioMolecules
10:58

Protein WISDOM: A Workbench for In silico De novo Design of BioMolecules

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Computational loop reconstruction based design of efficient PET hydrolases.

Hongzhao Wang1, Yuntao Cun1, Minxuan Wang1,2

  • 1College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China.

Communications Biology
|June 17, 2025
PubMed
Summary
This summary is machine-generated.

Engineered PET hydrolases with enhanced thermal stability and activity were developed through loop reconstruction. These improved enzymes show high PET conversion efficiency, paving the way for industrial plastic recycling and a circular economy.

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Area of Science:

  • Biotechnology
  • Polymer Science
  • Environmental Science

Background:

  • Enzymatic depolymerization of polyethylene terephthalate (PET) is crucial for plastic circular economy.
  • Current limitations in enzyme activity hinder industrial application of PET hydrolases.

Purpose of the Study:

  • To enhance the activity and thermal stability of PET hydrolases through protein engineering.
  • To evaluate the performance of engineered enzymes in PET waste recycling.

Main Methods:

  • Reconstruction of the β6-β7 loop in Bhr-PETase using double mutations (H218N/F222M) to create Bhr-NMT.
  • Transplantation of loop reconstruction mutations into LCC-ICCG and Kubu-PM12 to generate LCC-ICCG-NM and Kubu-PM12-NM.
  • Assessing enzyme activity, thermal stability, and PET conversion rates under various conditions.

Main Results:

  • The variant Bhr-NMT exhibited high thermal stability (Tm = 92.9°C) and an 87% increase in activity.
  • Engineered variants Bhr-NMT, LCC-ICCG-NM, and Kubu-PM12-NM achieved high PET conversion rates (90-94%) at high substrate concentration.
  • Kubu-PM12-NM demonstrated superior PET conversion (91%) even at reduced enzyme loading, outperforming benchmarks.

Conclusions:

  • Protein engineering of the β6-β7 loop significantly enhances PET hydrolase performance.
  • The developed engineered PET hydrolases show great potential for efficient industrial PET waste recycling.
  • This research contributes to advancing a circular economy for PET plastics.