Nanoscale Protein Assemblies for Amplification-Free Biosensing
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Solution Overview
Problem
Current biosensor technologies face challenges in achieving ultra-high sensitivity and specificity for detecting biological agents at very low concentrations, such as viral particles in COVID-19 diagnostics, due to limitations in protein-protein complex affinities and the need for amplification reactions, leading to high background noise and false positives.
Innovation Solution
Engineered responsive proteins are developed to fold downhill and generate fluorescent signals upon binding, configured as nanoscale assemblies for enhanced affinity and specificity, utilizing multivalent binding and adhesion to achieve sub-attoMolar range detection without amplification, and integrated into microscale particles for direct, one-step detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional biosensor technologies are used to detect biological agents at very low concentrations, then detection capability is achieved, but background noise and false positives increase
Solution Approach 1:
The patent combines multiple binding sites on a single nanoparticle surface, creating multivalent binding configurations where multiple binding moieties simultaneously interact with multiple epitopes on the target antigen. This merging of binding events amplifies the signal while maintaining specificity, enabling detection at sub-attoMolar concentrations without the background noise associated with conventional single-site binding assays
Solution Approach 2:
The patent creates synthetic copies of viral particles by displaying viral antigens on the surface of nanoparticles. These synthetic viral particle mimics replicate the binding properties of real viral particles without containing infectious material, enabling safe and sensitive detection through multivalent antigen presentation that mimics natural viral-antibody interactions
2Measurement precision
If amplification reactions are used to enhance detection sensitivity, then detection limit is improved, but device complexity and false positives increase
Solution Approach 1:
The patent employs self-service detection where the multivalent binding configuration itself provides the signal amplification mechanism. Multiple binding moieties on each nanoparticle simultaneously bind to multiple epitopes on target antigens, generating a strong binding signal without requiring external amplification reactions. This self-amplifying approach achieves sub-attoMolar detection limits while maintaining simple, rapid, and amplification-free assay protocols
3Reliability
If conventional protein-protein complexes are used for detection, then binding is achieved, but affinity and specificity are insufficient for ultra-low concentration detection
Solution Approach 1:
The patent merges multiple binding interactions by presenting multiple binding moieties on each nanoparticle surface, each capable of binding to epitopes on the target antigen. This multivalent configuration creates the equivalent of multiple protein-protein complexes simultaneously, dramatically enhancing overall binding affinity and specificity to enable reliable detection at sub-attoMolar concentrations where conventional single-complex approaches fail
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 enables ultra-high sensitivity and specificity for detecting biological agents at very low concentrations, reducing background noise and enabling instant, direct detection of pathogens without amplification, with improved resolution and sensitivity comparable to antibodies or nucleic acid hybridization.
Implementation Method 1
a selected protein may be purposely engineered to fold downhill and configured to output corresponding fluorescent signals
Implementation Method 2
a folding-unfolding property of proteins, wherein a protein folds and unfolds gradually (one-state downhill folding), can be utilized to develop analog single-molecule devices
Implementation Method 3
configured as nanoscale assemblies for enhanced affinity and specificity, utilizing multivalent binding and adhesion
Data Source
AI summary
The present disclosure provides methods for the identification and quantitation of targets (e.g., biological targets such as cells and viruses) using molecules comprising a binding moiety that binds to the target and a fluorescent moiety whose fluorescence properties are altered when the binding moiety binds to the target. A plurality of said molecules are specifically arranged in structures that resemble the size and shape of a cell to maximize affinity and sensitivity.