Molecular Sensor Scaffold Receptor Complex Dichroism
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Solution Overview
Problem
Current dichroic sensors are limited in their ability to detect molecules with low aspect ratios, as they require alignment, which is difficult to achieve for non-elongated molecules, restricting their application to only those that can bind to naturally alignable receptors.
Innovation Solution
A molecular sensor with a scaffold/receptor complex modified to incorporate a chromophore, providing a high aspect ratio, allowing alignment under flow conditions and enabling the detection of target molecules through linear dichroism, even for molecules without inherent alignment properties, by using a scaffold moiety and receptor molecules attached to form a complex with a specific chromophore.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If molecules are required to be aligned to exhibit dichroism, then detection sensitivity is improved, but applicability is limited to high aspect ratio molecules only
Solution Approach 1:
The patent introduces an alignable scaffold moiety as an intermediary carrier that binds to target molecules. The scaffold's high aspect ratio enables alignment under flow conditions, while the receptor moiety attached to the scaffold provides specificity for binding to target molecules of any shape. This intermediary approach allows dichroic detection of molecules that would otherwise be impossible to align directly.
Solution Approach 2:
The sensor element is segmented into distinct functional components: an alignable scaffold moiety (such as a filamentous bacteriophage) that provides the high aspect ratio for alignment, and a receptor moiety that provides target-specific binding. This segmentation allows each component to fulfill its specific function independently - the scaffold handles alignment while the receptor handles molecular recognition.
2Adaptability or versatility
If target molecules have low aspect ratios, then molecular diversity is increased, but alignment capability is lost
Solution Approach 1:
The alignable scaffold acts as a mediator that transfers the alignment capability from itself to the bound target molecule. During flow through the detection cell, hydrodynamic forces align the elongated scaffold, and consequently align any bound target molecules, regardless of the target's intrinsic shape or aspect ratio.
Solution Approach 2:
The invention changes the physical parameters of the detection system by using flow conditions (shear forces) to induce alignment of the scaffold-receptor complex. This dynamic parameter change during measurement allows molecules that cannot be statically aligned to exhibit dichroic signals.
3Measurement precision
If receptor molecules are attached to scaffolds to enable alignment, then detection capability is improved, but device complexity increases
Solution Approach 1:
The alignable scaffold moiety serves multiple functions simultaneously: it provides the high aspect ratio for alignment under flow, acts as a carrier for the receptor moiety, and contributes to the overall stability of the sensor element. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The sensor element is a composite structure combining the scaffold moiety (such as a filamentous bacteriophage) with the receptor molecule. This composite approach allows the system to exhibit properties of both components - the structural/alignment properties of the scaffold and the binding specificity of the receptor.
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
Enables the detection and quantification of target molecules with high sensitivity, including those with low aspect ratios, by tuning the dichroism to specific wavelengths and allowing for the analysis of binding properties and structural information, expanding the applicability of dichroic analysis beyond elongated molecules.
Implementation Method 1
The phenomenon being exploited in the above apparatus is known as dichroism. The incident light may be either linearly polarised, giving rise to linear dichroism (LD)... LD is the property exhibited by some molecular structures whereby linearly polarised light is differentially absorbed along two orthogonal axes.
Implementation Method 2
Absorption of light occurs within a molecule because, at a particular wavelength, the electric field of radiation urges the electrons in the molecule in a particular direction.
Implementation Method 3
LD is a measure of the difference of absorbance of the incident light between two orthogonal polarisations.
Data Source
AI summary
A molecular sensor that utilises dichroism can be used to identify the presence of specific molecules in a substance. The molecular sensor includes a sensor element comprising (i) a scaffold moiety and (ii) one or more receptor molecules for the target molecule attached to the scaffold moiety to form a scaffold/receptor complex, wherein the scaffold/receptor complex is modified to incorporate a chromophore and the modified scaffold/receptor complex has a high aspect ratio.