Fluorogenic Protein Labeling for Reduced Background Staining
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Solution Overview
Problem
Current methods for protein labeling and analysis face challenges in achieving high sensitivity, reducing background staining, and maintaining the integrity of electrophoretic and chromatographic results, particularly in distinguishing specific proteins within complex mixtures.
Innovation Solution
The use of amine reactive and thiol reactive fluorescent dyes, along with tag binding fluorogenic reagents, allows for specific labeling of proteins, enabling dual fluorescence measurements and reducing background noise through controlled pH and buffer conditions, thereby enhancing detection sensitivity and preserving the native properties of proteins during separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional protein labeling methods are used, then proteins can be labeled and detected, but background staining increases and detection sensitivity decreases
Solution Approach 1:
The patent applies preliminary action by labeling proteins with fluorogenic reagents before separation and analysis. This allows the labeling to occur under controlled conditions where background staining can be minimized, and the fluorescent signal is generated only when and where the labeled proteins are present, rather than attempting to remove background staining after the fact.
Solution Approach 2:
The patent utilizes parameter changes by employing pH-dependent fluorogenic reagents that exhibit low fluorescence under labeling conditions (reducing background) and high fluorescence under detection conditions. The change in pH or environmental conditions triggers a significant increase in fluorescent signal, thereby improving detection sensitivity while minimizing background staining.
2Measurement precision
If fluorescent labeling is performed to enhance detection sensitivity, then detection sensitivity improves, but electrophoretic migration and chromatographic resolution are affected
Solution Approach 1:
The patent applies local quality by using fluorogenic reagents that label specific functional groups on proteins (such as N-terminal amines or specific side chains) without modifying the overall structure or charge distribution of the protein. This localized labeling enhances detection sensitivity while preserving the protein's native electrophoretic and chromatographic properties.
Solution Approach 2:
The patent employs parameter changes by using labeling conditions (pH, buffer composition, temperature) that optimize both labeling efficiency and protein integrity. The fluorogenic reagents are designed to react under mild conditions that do not denature proteins or alter their migration characteristics, thereby maintaining reliability while improving detection sensitivity.
3Productivity
If rapid labeling is performed to reduce analysis time, then productivity increases, but labeling precision and reduction of non-specific artifacts decrease
Solution Approach 1:
The patent applies preliminary action by performing rapid labeling under optimized conditions that achieve both speed and precision. The fluorogenic reagents are designed to react quickly with target proteins while maintaining high specificity, allowing rapid labeling without sacrificing precision or generating excessive non-specific artifacts.
Solution Approach 2:
The patent utilizes parameter changes by optimizing labeling conditions (reagent concentration, pH, temperature, time) to achieve a balance between speed and precision. The pH-dependent fluorogenic reagents allow for rapid reaction kinetics while maintaining high specificity through controlled environmental parameters, thereby achieving both high productivity and labeling precision.
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 approach results in highly sensitive and reproducible protein analysis with minimal non-specific artifacts, allowing for rapid, real-time analysis without affecting electrophoretic migration or chromatographic resolution, and provides a significant increase in detection sensitivity, enabling precise identification of proteins within complex samples.
Implementation Method 1
The use of amine reactive and thiol reactive fluorescent dyes, along with tag binding fluorogenic reagents, allows for specific labeling of proteins
Implementation Method 2
amine reactive or thiol reactive fluorescent dye
Implementation Method 3
controlled pH and buffer conditions, thereby enhancing detection sensitivity
Implementation Method 4
separating and analyzing using techniques including, but not limited to, electrophoresis techniques
Implementation Method 5
chromatographic techniques
Data Source
AI summary
The present invention provides methods and compositions for labeling, separating and analyzing proteins, particularly a specific protein of interest within a cell lysate or in a mixture of proteins. The proteins are labeled with an amine reactive or thiol reactive fluorescent dye, or an amine reactive fluorogenic reagent that becomes fluorescent upon reacting to amine groups located on the protein. Following the labeling step, the proteins within the mixture can be separated and analyzed. In a further embodiment, a tag binding fluorogenic reagent that can bind to a tag on a tagged protein is added to specifically label the protein of interest.