Protease Assay Using Cleavage-Generated Neo-Binding Sites
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Solution Overview
Problem
Current methods for detecting enzymatic activities, such as protease activity, are limited in sensitivity and specificity, particularly for factors like FXa, FVIII, and caspase enzymes, which are crucial for coagulation pathways and disease diagnosis.
Innovation Solution
The method involves combining a sample with a substrate that contains an amino acid sequence with a cleavage site for the protease, where cleavage generates a neo-binding-site, and using a binding molecule that preferentially binds the neo-binding-site after protease activity, allowing for enhanced detection of protease activity through binding detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If chromogenic substrates are used for detecting protease activity, then the detection method is simple and widely applicable, but the sensitivity and specificity are limited
Solution Approach 1:
The substrate is divided into two functional parts: a protease recognition sequence (e.g., IEGR for FXa) and a heterologous neo-binding-site sequence (e.g., FLAG, HA, or V5 epitopes). This segmentation allows the substrate to serve dual purposes: being recognized by the protease and generating a detectable neo-binding-site upon cleavage, thereby improving sensitivity and specificity without requiring complex detection systems
Solution Approach 2:
A binding molecule (such as an antibody or affinity reagent) is introduced as an intermediary to detect the neo-binding-site generated by protease cleavage. This intermediary provides enhanced detection capability through specific binding interactions, allowing for more sensitive and specific measurement of protease activity compared to direct chromogenic detection
2Measurement precision
If conventional chromogenic substrates are used, then the assay procedure is straightforward, but the ability to accurately measure low levels of protease activity is insufficient
Solution Approach 1:
The invention utilizes colorimetric detection through chromogenic substrates that change color upon protease-mediated cleavage. The substrate contains a chromophore (such as pNA) that releases a colored product when cleaved, providing a visual and measurable signal that enhances detection accuracy for low levels of protease activity while maintaining procedural simplicity
3Measurement precision
If a substrate with a heterologous neo-binding-site is used, then sensitivity and specificity improve, but the substrate design and synthesis become more complex
Solution Approach 1:
The substrate design incorporates universal, well-characterized neo-binding-site sequences (such as FLAG, HA, V5, or Myc epitopes) that can be recognized by commercially available binding molecules. This multi-functionality approach allows the same substrate structure to be used for detecting various proteases by simply changing the protease recognition sequence, thereby reducing long-term manufacturing and detection complexity
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 improves the sensitivity and specificity of protease activity detection, enabling accurate measurement of FXa, FVIII, and caspase activities, which is essential for coagulation factor analysis and disease diagnosis.
Implementation Method 1
cleavage at the cleavage site generates a neo-binding-site
Implementation Method 2
the first binding molecule preferentially binds the neo-binding-site after cleavage of the substrate by the protease activity
Data Source
AI summary
The present invention relates to method of detecting activity of a sample. Some methods involve detecting a neo-binding-site created by the activity such as detecting an activity of a protease by detecting a neo-binding-site created by cleavage of a substrate by the protease.