Continuous High-Throughput Colorimetric Assays for α-Transaminases

Area of Science:

• Biocatalysis
• Enzyme Assays
• Organic Chemistry

Background:

• Transaminases are crucial biocatalysts for synthesizing chiral amines from prochiral ketones.
• Naturally occurring α-transaminases provide access to diverse L- and D-α-amino acids.
• Efficient methods are needed for enzyme characterization and screening.

Purpose of the Study:

• To develop and validate continuous colorimetric assays for quantifying transaminase activity.
• To facilitate kinetic studies of transaminases.
• To enable high-throughput screening of enzyme collections for biocatalytic applications.

Main Methods:

• Development of two continuous colorimetric assays.
• Utilized keto acid and standard donor substrates (L- or D-Glutamic acid, cysteine sulfinic acid).
• Assays monitor transamination reactions colorimetrically.

Main Results:

• The developed assays accurately quantify transamination activity.
• Assays are suitable for both detailed kinetic analyses and large-scale screening.
• Demonstrated utility for diverse transaminase-catalyzed reactions.

Conclusions:

• Continuous colorimetric assays provide an efficient tool for studying transaminases.
• These assays support the discovery and optimization of biocatalysts for chiral amine synthesis.
• Facilitates enzyme engineering and directed evolution efforts.