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Updated: Jul 6, 2026
Multi-enzyme Screening Using a High-throughput Genetic Enzyme Screening System
Published on: August 8, 2016
A nanostructure-initiator mass spectrometry-based enzyme activity assay
Trent R Northen1, Jinq-Chyi Lee, Linh Hoang
1Department of Molecular Biology and Scripps Center for Mass Spectrometry and Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
A new Nanostructure-Initiator Mass Spectrometry (NIMS) enzymatic (Nimzyme) assay enables sensitive detection of enzyme activity in complex biological samples. This method allows for efficient analysis of enzymatic reactions and characterization of enzymes from crude lysates.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Enzymology
Background:
- Complex biological samples often pose challenges for enzyme activity assays due to signal suppression.
- Existing methods may require extensive sample purification, limiting throughput.
- Novel immobilization techniques are needed for sensitive and direct enzyme analysis.
Purpose of the Study:
- To develop and validate a novel Nanostructure-Initiator Mass Spectrometry (NIMS) enzymatic (Nimzyme) assay for sensitive enzyme detection.
- To demonstrate the assay's capability in analyzing enzymatic activity within complex biological mixtures.
- To characterize a specific enzyme activity from a microbial community lysate.
Main Methods:
- Enzyme substrates immobilized on NIMS surface via fluorous-phase interactions for "soft" immobilization.
- Utilized surface-washing steps to mitigate signal suppression from complex samples.
- Detected enzyme activity by measuring product formation or substrate cleavage using NIMS.
Main Results:
- The Nimzyme assay demonstrated sensitivity to subpicogram enzyme levels.
- Successfully detected both enzyme addition (sialyltransferase) and cleavage (galactosidase) reactions.
- Characterized beta-1,4-galactosidase activity from a thermophilic microbial community lysate, identifying optimal conditions (65°C, pH 5.5) and inhibitors.
- Metagenomic analysis suggested the enzyme originated from an uncultured gamma-proteobacterium.
Conclusions:
- The Nimzyme assay provides an efficient method for detecting and characterizing enzymatic activities in complex biological mixtures.
- This approach is valuable for pre-sequencing or pre-cloning efforts.
- The assay has broad applications in screening enzyme/inhibitor libraries, glycan microarrays, and fluorous-phase organic synthesis.
