Bound-Protease Gel Columns for Rapid Protein Digestion
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Solution Overview
Problem
Existing methods for enzymatic protein digestion are inefficient and unpredictable, often requiring high temperatures and long reaction times, leading to incomplete digestion and variable results, especially at lower temperatures, making automation and parallel processing challenging.
Innovation Solution
A method using a water-swollen gel column bed with bound proteases for enzymatic cleavage of proteins at temperatures below 37°C, employing back and forth flow to ensure complete digestion within a short time frame, suitable for automation and parallel processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high temperatures (40-60°C) are used for enzymatic protein digestion, then digestion speed and completeness are improved, but enzyme stability and sample integrity deteriorate due to potential denaturation
Solution Approach 1:
The invention changes the temperature parameter from conventional high temperatures (40-60°C) to lower temperatures (20-37°C), and combines it with extended digestion time (16-48 hours) to achieve both complete digestion and enzyme stability. This parameter optimization resolves the contradiction between digestion speed and enzyme stability.
Solution Approach 2:
The invention employs preliminary protein denaturation and reduction steps before enzymatic digestion. By pre-unfolding the protein structure through denaturants (urea, guanidine HCl) and reducing agents (beta-mercaptoethanol, DTT), the protein becomes more accessible to the enzyme at lower temperatures, eliminating the need for high temperature treatment while achieving complete digestion.
2Manufacturing precision
If long digestion times (overnight or longer) are used to achieve complete protein digestion, then digestion completeness is improved, but processing efficiency and automation capability deteriorate
Solution Approach 1:
The invention performs preliminary denaturation and reduction of proteins before enzymatic digestion. This pre-treatment unfolds the protein structure and exposes cleavage sites, enabling the protease to work efficiently at lower temperatures and achieve complete digestion within 16-48 hours, significantly reducing the conventional overnight or longer digestion times.
Solution Approach 2:
The invention optimizes multiple parameters simultaneously: temperature (20-37°C), pH (7-9), enzyme-to-substrate ratio, and digestion time (16-48 hours). This comprehensive parameter optimization enables complete digestion while maintaining high processing efficiency and compatibility with automated systems, resolving the contradiction between completeness and productivity.
3Productivity
If high enzyme concentrations are used to accelerate protein digestion, then digestion speed is improved, but cost and complexity of the procedure deteriorate
Solution Approach 1:
The invention employs preliminary denaturation and reduction steps that unfold the protein structure and expose cleavage sites. This makes the protein substrate more accessible and reactive, allowing the protease to work efficiently at lower enzyme concentrations while still achieving complete and rapid digestion, thereby reducing cost and simplifying the procedure.
Solution Approach 2:
The invention optimizes the enzyme-to-substrate ratio in combination with temperature (20-37°C) and pH (7-9) parameters. This balanced optimization enables efficient digestion at moderate enzyme concentrations, avoiding the need for high enzyme amounts while maintaining high digestion speed and simplicity.
4Adaptability or versatility
If variable and unpredictable digestion results are obtained from conventional methods, then adaptability to different proteins is reduced, but standardization and automation become more difficult
Solution Approach 1:
The invention employs standardized preliminary denaturation and reduction steps that consistently unfold protein structures before digestion. This pre-treatment ensures that all proteins, regardless of their native structure, are prepared in a uniform state that is highly accessible to the protease, producing consistent and reproducible digestion results across different protein types, which enables automation.
Solution Approach 2:
The invention uses optimized and standardized parameters including temperature (20-37°C), pH (7-9), digestion time (16-48 hours), and enzyme-to-substrate ratio. These standardized parameters ensure consistent digestion results across different proteins, providing both high adaptability and reproducibility, which are essential for automation and high-throughput processing.
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
Achieves rapid and reproducible protein digestion with greater than 50% coverage in less than 4 hours at room temperature, enabling efficient sample preparation for mass spectrometry analysis without the need for incubation or high enzyme concentrations.
Implementation Method 1
A protease is an enzyme that performs proteolysis by cleaving peptide bonds of proteins and (poly)peptides
Implementation Method 2
Trypsin, one of the most common proteases used for cleaving proteins, is a serine protease
Implementation Method 3
Providing a water swollen gel column bed comprising at least one bound protease
Data Source
AI summary
The present invention relates to a method for qualitative analysis of a sample protein, which method comprises the steps of providing a water swollen gel column bed comprising bound protease and a sample protein in liquid buffer, digesting the sample protein into polypeptides by contact with the gel bed and subjecting the polypeptides to mass spectrometry (MS). The method is advantageously performed using back and forth flow of the sample protein including two or more repeats, and may be performed at a temperature of less than about 37° C., such as a temperature of less than about 30° C.The invention also includes an automated method as well as a device and a kit for performing mass-based analysis of proteins with higher speed than the prior art while maintaining conditions that are tolerable to the protease.