Barcoded Enzyme Substrate Specificity Determination
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Solution Overview
Problem
Current methods for determining the identity and activity of gene products, such as enzymes, lack multiplex capability and high throughput, making them inefficient for identifying substrate specificity and enzymatic activity.
Innovation Solution
The use of barcoded enzymes, where the enzyme is cleavably fused to a peptide barcode, allows for the determination of substrate specificity and enzymatic activity through mass spectrometry by analyzing the mass spectrum of reactions with proteases and candidate substrates, enabling identification and quantification of enzyme activities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional LC-MS or spectroscopy methods are used to determine enzyme activities and substrates, then measurement precision is achieved, but productivity and multiplex capability are limited
Solution Approach 1:
The method segments the enzyme identification process by attaching unique peptide barcodes to different enzymes. Each barcode serves as a distinct marker that can be detected by mass spectrometry, allowing simultaneous analysis of multiple enzymes in a single reaction mixture rather than analyzing each enzyme separately
Solution Approach 2:
The mass spectrometry technique serves multiple functions simultaneously: it identifies enzymes through their unique peptide barcodes, determines substrate specificity by detecting modified substrates, and quantifies enzymatic activity through signal intensity. This single technique replaces multiple separate assays, enabling high-throughput multiplexed analysis
2Measurement precision
If traditional methods are used for enzyme characterization, then individual enzyme analysis is thorough, but loss of time increases due to sequential analysis requirements
Solution Approach 1:
The method merges multiple enzyme characterization tasks into a single experimental setup. Multiple barcoded enzymes are incubated together with candidate substrates in one reaction mixture, and mass spectrometry simultaneously detects all enzyme-substrate interactions, eliminating the need for sequential analysis of individual enzymes
3Productivity
If barcoded enzymes with protease cleavage sites are used, then multiplex capability and throughput are improved, but device complexity increases due to additional components
Solution Approach 1:
Peptide barcodes serve as intermediaries between the enzyme and the detection system. These short peptide sequences are attached to enzymes, serve as unique identifiers detectable by mass spectrometry, and include protease cleavage sites that allow for controlled release and detection. The barcodes mediate the interaction between the biological enzyme and the analytical detection system, enabling multiplexed identification without requiring complex imaging or labeling systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables rapid and scalable determination of gene functions, allowing for the identification of enzyme activities and substrate specificities with high throughput and multiplexing capabilities, facilitating the understanding of metabolic processes in organisms.
Implementation Method 1
incubating the barcoded enzyme with a protease capable of removing the peptide barcode from the barcoded enzyme
Implementation Method 2
incubating the barcoded enzyme with a protease capable of removing the peptide barcode from the barcoded enzyme and one or more candidate substrates to obtain one or more modified candidate substrates
Implementation Method 3
generating a mass spectrum of each of the one or more reactions; determining a substrate specificity of the enzyme with respect to each of the one or more candidate substrates based on the mass spectrum
Data Source
AI summary
Disclosed herein are methods, systems and compositions for determining substrate specificity of an enzyme. The disclosed methods, systems and compositions can be used for identifying enzymes capable of modifying substrates of interest and/or quantifying enzymatic activity.