X-ray Microscope for Label-Free Binding Analysis
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Solution Overview
Problem
Current high-throughput screening methods for drug development require radiolabeled or tagged chemicals, which may alter the binding properties of proteins, making it difficult to predict effective chemical-protein interactions and estimate therapeutic indices.
Innovation Solution
An X-ray microscope with a polychromatic X-ray source and a focusing chip substrate that measures X-ray fluorescence signals from chemicals bound to receptors, allowing for the estimation of binding selectivity and therapeutic index without altering the chemical structure, using a method that involves establishing baseline signals and calculating net fluorescence quotients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radiolabeled or tagged chemicals are used in high-throughput screening, then the binding properties of proteins can be detected, but the binding properties may be altered and therapeutic index estimation becomes difficult
Solution Approach 1:
The patent extracts and eliminates the radiolabel or tag from the chemical structure by using X-ray fluorescence detection that can identify the chemical element directly without requiring any label. The X-ray source irradiates the chemical-protein complex and the detector measures the fluorescence signal from the chemical's inherent elements, thus removing the harmful labeling step while maintaining detection capability
Solution Approach 2:
The patent introduces X-ray fluorescence as an intermediary detection method that bridges the gap between chemical structure and binding property measurement. Instead of directly observing the chemical's binding through labels, the X-ray fluorescence signal serves as an intermediary that identifies the chemical's presence and properties without altering its structure or binding behavior
2Ease of manufacture
If tagged molecules are used to make chemicals visible for screening, then detection is enabled, but the structural changes may affect binding affinity
Solution Approach 1:
The patent removes the need for fluorescent tags or other visible labels by utilizing the chemical's own elemental composition as the detection target. The X-ray fluorescence technique detects characteristic X-rays emitted by elements within the chemical molecule itself, eliminating the tag while preserving the chemical's native structure and binding properties
Solution Approach 2:
The patent creates a label-free detection system where the chemical's elemental signature serves as its own identifier. Instead of attaching an external tag that copies or represents the chemical, the system directly detects the chemical's inherent elemental composition through X-ray fluorescence, providing an authentic representation without structural modification
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 accurate measurement of binding affinities and selectivities between chemicals and receptors, facilitating drug development by providing reliable data on chemical-protein interactions without structural alterations, thus improving the drug discovery process.
Implementation Method 1
detect and measure an intensity of the X-ray fluorescence of the sample due to irradiation of an atom of a chemical bound to a receptor of the sample by the polychromatic X-ray source
Data Source
AI summary
There is described an apparatus for measuring protein characteristics comprising an X-ray fluorescence (XRF) spectrometer comprising a source of polychromatic X-rays, an X-ray detector, a protein, a molecule that has been exposed to and at least weakly binds to the protein, a plurality of X-ray fluorescence signal data obtained by irradiating chemical elements in the protein and molecule with the polychromatic X-rays and a security system for maintaining records for the data from the plurality of X-ray fluorescence signal measurements. There is also described an x-ray microscope for measuring a sample.