Chromogenic Polypeptide Protease Detection Substrate
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Solution Overview
Problem
Existing chromogenic protease substrates have limited protease specificity due to the restricted format of polypeptides with chromogenic moieties positioned at the C-terminus, poor water solubility, and complex synthesis processes, which hinder commercial-scale production and diagnostic visualization.
Innovation Solution
A polypeptide with a chromogenic amino acid flanked by amino acids at both the N and C termini, capable of reacting with a conjugated aldehyde to produce a detectable signal upon protease cleavage, allowing for improved specificity and solubility, and facilitating immobilization on a solid surface for enhanced diagnostic methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If chromogenic moiety is positioned at the C-terminus of polypeptide, then synthesis is simplified, but protease specificity is limited
Solution Approach 1:
The invention divides the polypeptide structure into distinct functional segments: an N-terminal region with flanking amino acids that provide protease recognition and specificity, a central chromogenic amino acid region that provides detection capability, and a C-terminal region. This segmentation allows each part to fulfill its specific function optimally - the N-terminal flanking residues ensure enzyme specificity while the chromogenic moiety enables detection, resolving the contradiction between synthesis simplicity and protease specificity.
2Ease of manufacture
If chromogenic moiety is positioned at the C-terminus, then formulation is simplified, but water solubility is poor
Solution Approach 1:
The invention applies local quality by introducing hydrophilic flanking amino acid residues at the N-terminus of the chromogenic amino acid. These locally modified regions with polar, water-soluble side chains (such as lysine, arginine, or glutamate) improve the overall water solubility of the polypeptide substrate without affecting the chromogenic detection capability or requiring complex formulation processes.
3Measurement precision
If longer polypeptides are synthesized to improve specificity, then protease recognition is enhanced, but synthesis complexity increases
Solution Approach 1:
The invention extracts and utilizes the essential protease recognition elements by incorporating only the necessary flanking amino acid residues (typically 1-3 residues at the N-terminus) that are sufficient for specific enzyme recognition. This extraction approach provides adequate protease specificity without requiring excessively long polypeptide sequences, thereby maintaining synthesis simplicity while achieving the desired level of enzyme recognition and specificity.
4Ease of operation
If C-terminal chromogen is used, then detection is straightforward, but solid surface conjugation is limited
Solution Approach 1:
The invention enhances versatility by incorporating functional flanking amino acid residues (such as cysteine, lysine, or carboxyl-terminal residues) that can serve multiple purposes: maintaining protease recognition, improving water solubility, and providing additional conjugation sites for solid surface attachment. This multi-functional design allows the polypeptide to be conjugated to various solid supports (membranes, beads, plates) while preserving the chromogenic detection capability and protease specificity.
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
The solution provides enhanced protease specificity, improved water solubility, and simplified synthesis, enabling more effective detection of protease enzymes with improved enzyme turnover and color production compared to traditional substrates.
Implementation Method 1
the chromogenic amino acid is capable of reacting with a conjugated aldehyde
Implementation Method 2
a target sequence for a target protease which is capable of cleaving the peptide bond comprising the amino group of the chromogenic amino acid
Data Source
AI summary
A polypeptide comprising a chromogenic amino acid. The chromogenic amino acid is flanked by at least one amino acid to the N and C termini thereof. The amine group of the chromogenic amino acid has a pKa of less than 5. The chromogenic amino acid is capable of reacting with a conjugated aldehyde. The polypeptide comprises a target sequence for a target protease which is capable of cleaving the peptide bond comprising the amino group of the chromogenic amino acid.