Related Experiment Video
Updated: Apr 13, 2026
08:10
Multi-enzyme Screening Using a High-throughput Genetic Enzyme Screening System
Published on: August 8, 2016
8.8K
Increasing the Soluble Expression and Whole-Cell Activity of the Plastic-Degrading Enzyme MHETase through Consensus
Jake W Saunders1, Adam M Damry1, Vanessa Vongsouthi1
1Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia.
Biochemistry
|June 17, 2024
Summary
Engineered variants of mono(2-hydroxyethyl) terephthalate hydrolase (MHETase) show over 10-fold greater activity for plastic degradation. Improved protein folding and soluble expression overcome previous limitations for industrial applications.
Area of Science:
- Biotechnology
- Enzymology
- Protein Engineering
Background:
- Mono(2-hydroxyethyl) terephthalate hydrolase (MHETase) from *Ideonella sakaiensis* is key to the enzymatic breakdown of poly(ethylene terephthalate) (PET).
- Poor recombinant expression of MHETase hinders its industrial use in PET depolymerization.
Purpose of the Study:
- To develop a medium-throughput assay for quantifying MHETase activity.
- To engineer improved MHETase variants with enhanced activity and expression for PET recycling.
Main Methods:
- Developed a medium-throughput assay for MHETase activity in cell lysates and suspensions.
- Utilized consensus design to generate and screen engineered MHETase variants.
- Performed biochemical and structural analysis to understand protein improvements.
Main Results:
- Generated MHETase variants with over 10-fold greater whole-cell activity compared to wild-type.
- Identified increased soluble expression as a primary factor for enhanced activity.
- Protein folding improvements were indicated as the cause of increased soluble expression.
Conclusions:
- Engineered MHETase variants demonstrate significantly improved performance for PET depolymerization.
- Enhanced soluble expression and protein folding are crucial for overcoming recombinant expression limitations.
- These findings pave the way for industrial applications of MHETase in plastic recycling.
Related Concept Videos
01:22Bioreactor Controls-III
55
Strain improvement is a foundational strategy in industrial microbiology aimed at maximizing microbial productivity, particularly because natural isolates typically yield commercially valuable products in very low concentrations. Although optimizing the culture medium and environmental conditions can improve yields, these adjustments are inherently limited by the organism’s genetic potential. As a result, the focus shifts toward genetic modifications to enhance biosynthetic capacity. The...
55
01:28Microbial Bioremediation of Plastics
93
Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...
93