Acid Hydrolyzed Nylon-6 Turbidity as a Novel, Efficient, and Adaptable Assay for Nylonase Activity

Area of Science:

• Biotechnology
• Polymer Science
• Enzyme Engineering

Background:

• Enzyme development is crucial for plastic recycling and valorization.
• Nylon-6 is a widely used plastic in various industries, necessitating efficient recycling methods.
• Existing high-throughput assays for nylonase activity have limitations, hindering enzyme engineering efforts.

Purpose of the Study:

• To develop a robust and versatile high-throughput assay for screening nylon-6 hydrolyzing enzymes.
• To overcome the limitations of current nylonase screening methods.
• To facilitate the discovery and engineering of improved nylonases for nylon-6 recycling.

Main Methods:

• Utilized acid oligomerized nylon-6 (AON6) as a model substrate for nylonase activity assay.
• Developed an assay compatible with purified proteins and cell lysates.
• Enabled variation in assay conditions, including pH, solid loading, and enzyme concentration.

Main Results:

• Demonstrated the efficacy of AON6 in assaying nylon-6 hydrolyzing enzymes.
• The new assay method is adaptable to different experimental conditions.
• The assay overcomes common pitfalls associated with existing nylonase screening methods.

Conclusions:

• The AON6 assay provides a more reliable and flexible platform for high-throughput screening of nylonases.
• This advancement is expected to accelerate the engineering of enzymes for effective nylon-6 recycling.
• The developed method supports the identification of novel biocatalysts for sustainable plastic waste management.