Protein Standard Multi-Modal Detection Gel Electrophoresis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current protein gel electrophoresis techniques face challenges in sensitive and specific detection of proteins, particularly in characterizing molecular weight and purity, due to limitations in existing protein standards and detection methods.
Innovation Solution
A protein standard comprising multiple protein sets with unlabeled and labeled proteins, where the labeled proteins have spectrally distinct haloalkylated tryptophan or covalently linked dyes, allowing for multi-modal detection and characterization, including UV-induced fluorescence and visible light detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional protein standards are used for gel electrophoresis, then the technique is simple and cost-effective, but the detection sensitivity and specificity are insufficient
Solution Approach 1:
The protein standard is divided into multiple protein sets, where each set contains proteins with specific molecular weights and detection characteristics. This segmentation allows different protein sets to be detected by different modalities (UV fluorescence, visible light, mass spectrometry) simultaneously, improving overall detection sensitivity without requiring a single complex standard
Solution Approach 2:
The protein standard comprises a composite mixture of labeled and unlabeled proteins with different properties. Labeled proteins contain specific amino acid motifs or covalently attached chemical groups that enable detection by various methods, while unlabeled proteins provide molecular weight references. This composite structure enhances both detection sensitivity and versatility
2Adaptability or versatility
If protein standards with multiple labels are used, then multi-modal detection is enabled, but the spectral overlap between labels increases
Solution Approach 1:
Different protein sets within the standard are assigned different local detection qualities - some are optimized for UV fluorescence detection, others for visible light absorption, and some for mass spectrometry. This local optimization allows each protein set to be detected by its最适合 modality without spectral interference, maintaining measurement precision while enabling multi-modal detection
3Measurement precision
If labeled proteins are used to enhance detection, then sensitivity improves, but the cost of the protein standard increases
Solution Approach 1:
Instead of labeling all proteins in the standard, only specific protein sets are labeled with detectable groups. This partial labeling approach provides sufficient detection sensitivity for those specific proteins while keeping the overall standard cost-effective. The unlabeled proteins still serve as molecular weight references
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
Enables robust and precise characterization of proteins through multiple detection modalities, improving sensitivity and specificity in protein characterization and detection, even in the presence of reducing agents.
Implementation Method 1
said unlabeled protein comprising a tryptophan residue, and said labeled protein comprising a label that is spectrally distinct from haloalkylated tryptophan
Implementation Method 2
the label of the labeled protein is an amino acid residue covalently linked to a porphyrin... The label is an amino acid residue covalently linked to a dye
Data Source
Figure 1
Figure 2A~2C
AI summary
Disclosed herein is a protein standard for gel electrophoresis. The standard may be detected using multiple modalities. These modalities include, for example, observation of color or fluorescence arising from dyes, porphyrins, or haloalkylated tryptophan residues covalently linked to proteins of the standard; or detection of fluorescence or chemiluminescence arising from antibodies or other binding partners bound to proteins of the standard through polypeptide epitopes or affinity tags. The protein standard comprises multiple protein sets, each set corresponding to a different gel band, and proteins within a set may be detectable with one or more modalities.