Promiscuity-Guided Enzyme Evolution via Substrate Multiplexed Screening.

Area of Science:

• Biocatalysis and Enzyme Engineering
• Synthetic Biology
• Biotechnology

Background:

• Enzyme substrate promiscuity is crucial for biocatalyst development but challenging to assess using traditional single-substrate directed evolution.
• Single-substrate screening can limit evolutionary pathways and may not reveal an enzyme's full reactivity spectrum.
• Understanding and engineering substrate scope is vital for expanding biocatalytic applications.

Purpose of the Study:

• To review substrate multiplexed screening (SUMS) as a strategy to overcome limitations of single-substrate screening in enzyme engineering.
• To highlight how SUMS provides comprehensive information on enzyme promiscuity and guides biocatalyst development.
• To demonstrate the advantages of SUMS in uncovering enzyme reactivity and facilitating engineering efforts.

Main Methods:

• Review of substrate multiplexed screening (SUMS) methodology.
• Analysis of SUMS application in enzyme engineering and directed evolution.
• Comparison of SUMS with traditional single-substrate screening approaches.

Main Results:

• SUMS quantifies multiple products simultaneously by placing substrates in direct competition, mimicking natural enzyme environments.
• SUMS increases information density compared to parallel screening and reveals enzyme activity shifts invisible to single-substrate methods.
• SUMS application has led to the development of enzymes with broad or complementary substrate scopes and identified key mutations.

Conclusions:

• SUMS is a powerful strategy for characterizing and engineering enzyme substrate promiscuity, offering significant advantages over traditional methods.
• This approach accelerates the discovery of biocatalysts with enhanced and broader reactivity profiles.
• SUMS provides critical insights for designing enzymes for complex biological systems and diverse industrial applications.