A multisubstrate assay for lipases/esterases: assessing acyl chain length selectivity by reverse-phase...

Area of Science:

• Biochemistry
• Enzymology

Background:

• Lipases and esterases are hydrolytic enzymes crucial in various biological and industrial processes.
• These enzymes exhibit unique substrate specificity and acyl chain length selectivity, influencing their applications.
• Understanding enzyme selectivity is vital for optimizing biocatalysis and biochemical research.

Purpose of the Study:

• To develop and validate a straightforward assay for determining the acyl chain length selectivity of lipases and esterases.
• To characterize the chain length selectivity of selected lipases and esterases using the developed assay.

Main Methods:

• Development of a competitive multiple substrate assay utilizing reversed-phase high-performance liquid chromatography (RP-HPLC) with UV detection.
• Establishment and validation of a method for the separation and quantification of 4-nitrophenyl fatty acid esters (C4-C18).
• Determination of enzyme selectivity through multisubstrate reactions with equimolar concentrations of various 4-nitrophenyl esters.

Main Results:

• A robust method for separating and quantifying 4-nitrophenyl fatty acid esters (C4-C18) was successfully developed and validated.
• The acyl chain length selectivity of five lipases and two esterases was successfully determined using the novel assay.
• The assay demonstrated simplicity, reproducibility, and effectiveness in characterizing enzyme selectivity.

Conclusions:

• The developed competitive multiple substrate assay is a valuable and practical tool for assessing acyl chain length selectivity in lipases and esterases.
• This method provides a reliable means for enzyme characterization, aiding in enzyme discovery and application development.
• The assay's simplicity and reproducibility make it suitable for routine use in biochemical and biotechnological laboratories.