Protease Activity Detection via Fluorescent Substrate Library

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current methods for detecting protease activity in complex biological samples, such as blood, plasma, or serum, are limited by the need for sample processing and lack of selectivity, which can lead to misconceptions about protease function and inefficiencies in drug development and diagnostics.

Innovation Solution

The methods involve incubating a complex biological sample with a substrate library and a tag to generate cleavage products, separating these products using techniques like gel electrophoresis or electrokinetic methods, and generating a proteolytic signature to identify multiple classes of protease activity without sample processing, using activity-based probes and charge-changing substrates for visualization and purification.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If sample processing is performed to detect protease activity, then measurement precision is improved, but loss of time and productivity deteriorate

Engineering Contradiction:

Improveprotease activity detection accuracyVSAvoidsample processing time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The substrate library is pre-labeled with fluorescent tags and designed with specific cleavage sites before the assay. This preliminary preparation allows the substrates to be ready for immediate use when added to the biological sample, eliminating the need for post-incubation processing or labeling steps that would consume time.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention extracts and detects only the fluorescently labeled cleavage products from the complex biological sample using electrophoretic separation. This extraction approach isolates the relevant signal (cleaved substrates) from the complex background, enabling accurate protease activity measurement without extensive sample processing or purification steps.

Inventive Principle:

Principle #2Taking out (Extraction)

2Ease of operation

If conventional detection methods are used, then ease of operation is maintained, but measurement precision and reliability deteriorate due to lack of selectivity

Engineering Contradiction:

Improvedetection method simplicityVSAvoidprotease activity detection accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The substrate library consists of substrates with specific local qualities - each substrate contains a unique fluorescent label and a specific peptide sequence with a defined cleavage site. This local quality differentiation allows specific proteases to be identified by their preferential cleavage of particular substrate sequences, enhancing measurement precision while maintaining operational simplicity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention uses fluorescent tags that emit different colors or fluorescence intensities upon cleavage. This color/fluorescence change provides a highly selective and precise readout mechanism that can be detected using standard fluorometers, maintaining ease of operation while dramatically improving measurement precision and reliability.

Inventive Principle:

Principle #32Color changes

3Measurement precision

If complex sample processing is performed, then measurement precision is improved, but device complexity and ease of manufacture worsen

Engineering Contradiction:

Improveprotease activity detection accuracyVSAvoidsample processing system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The electrophoretic separation system serves multiple functions: it separates the cleaved substrates from unreacted substrates, concentrates the fluorescent signal, and provides size-based separation that enhances detection precision. This single multi-functional device replaces what would otherwise require multiple separate processing steps and instruments.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The fluorescently labeled substrate acts as an intermediary that mediates between the protease activity and the detection system. The substrate is cleaved by the protease and then detected by its fluorescent properties, providing a bridge that simplifies the overall system while maintaining high measurement precision.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 allows for the detection and visualization of protease activity in complex samples without processing, providing a comprehensive understanding of protease activity and enabling more accurate drug discovery and diagnostics by identifying specific proteases and their activities directly in biological fluids.

Implementation Method 1

Proteases are enzymes that carry out the hydrolysis of peptide bonds within proteins and polypeptides

Methodology Applied

Scientific EffectProteolytic cleavage: Hydrolysis

Implementation Method 2

separating the cleavage products from the complex sample by gel electrophoresis, capillary electrophoresis, or a combination of DC and AC electrokinetic techniques

Methodology Applied

Scientific EffectGel electrophoresis: Electrophoresis