Nucleic Acid Sensor for BACE1 Activity in Viable Cells
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Solution Overview
Problem
Current methods for assessing BACE1 activity in Alzheimer's disease are limited by their inability to demonstrate enzymatic activity in viable cells and fail to accurately assess activity within cellular compartments implicated in Aβ production, necessitating the development of novel sensors to monitor BACE1 activity in cells and organelles.
Innovation Solution
A nucleic acid-based sensor comprising a sensing strand with a nucleic acid-peptide conjugate, a donor fluorophore, and a quencher, where the peptide is cleavable, allowing spatial separation upon cleavage and increased fluorescence measurement, and a reference strand for ratiometric analysis, enabling the determination of enzyme activity within cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If in vitro biochemical assessment using total cell lysate is used, then BACE1 activity can be assessed, but the ability to demonstrate enzymatic activity in viable cells is lost
Solution Approach 1:
The patent replaces mechanical/biochemical extraction methods (cell lysis) with a fluorescent optical detection system. A fluorescent sensor molecule is introduced that can detect BACE1 activity directly in viable cells through fluorescence emission, eliminating the need for cell lysis while maintaining reliable activity assessment.
Solution Approach 2:
The patent introduces a fluorescent sensor molecule as an intermediary between BACE1 and the detection system. This sensor molecule specifically binds to or reacts with BACE1 and produces a fluorescent signal, enabling indirect detection of enzyme activity in viable cells without direct extraction.
2Measurement precision
If total cell lysate assessment is used, then BACE1 activity measurement is possible, but accurate assessment within specific cellular compartments is lost
Solution Approach 1:
The patent applies local quality by designing fluorescent sensors with specific localization properties that allow them to accumulate or function preferentially in specific cellular compartments such as endosomes or lysosomes. This enables compartment-specific BACE1 activity measurement while maintaining measurement precision.
Solution Approach 2:
The patent employs nested structures where fluorescent sensor molecules are contained within or targeted to specific cellular compartments (endosomes, lysosomes). This nesting allows the detection system to focus on BACE1 activity within specific subcellular locations rather than requiring complex fractionation procedures.
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 sensor effectively measures BACE1 activity in cells, including endosomal compartments, providing insights into Alzheimer's disease pathogenesis and allowing for the assessment of enzyme inhibitor effectiveness, with demonstrated specificity and sensitivity in both in vitro and in vivo settings.
Implementation Method 1
a donor fluorophore and a quencher, wherein the peptide comprises a cleavable peptide sequence, and the donor fluorophore and quencher are conjugated to the nucleic acid-peptide conjugate such that cleavage of said peptide results in spatial separation of the donor fluorophore and quencher and an increase in fluorescence from the donor fluorophore
Data Source
AI summary
The invention relates to nucleic acid-based sensors and their use in determining enzyme activity, disease detection, and monitoring the effectiveness of enzyme inhibitors.