Chimeric Peptide Standards for Aβ42 Immunoassay Calibration
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Solution Overview
Problem
Current methods for measuring Aβ42 in biological samples face challenges due to its rapid aggregation and poor solubility, making it difficult to use synthetic Aβ42 peptides as reference standards in immunoassays, which are essential for accurately quantifying Aβ42 levels.
Innovation Solution
Development of non-aggregating peptide reference standards comprising an N-terminal immunoreactive region, a C-terminal immunoreactive region, and a linker region, which can be used in immunoassays to measure Aβ42 levels accurately, preventing aggregation and improving solubility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If synthetic Aβ42 peptides are used as reference standards in immunoassays, then the measurement of Aβ42 levels can be performed, but the peptides rapidly aggregate and exhibit poor solubility, making it difficult to use them as reference standards
Solution Approach 1:
The Aβ42 peptide is segmented into two separate fragments: an N-terminal fragment (residues 1-20) and a C-terminal fragment (residues 21-42). These fragments are connected via a flexible linker to create a chimeric peptide structure. This segmentation prevents the formation of the aggregation domain while preserving the immunoreactive regions, thereby resolving the contradiction between measurement capability and peptide stability.
Solution Approach 2:
The aggregation domain (residues 16-20: KLVFF) is extracted or removed from the Aβ42 sequence in the chimeric peptide design. By eliminating this specific region that mediates aggregation, the peptide maintains solubility and monomeric form while retaining the N-terminal and C-terminal immunoreactive regions necessary for immunoassay detection and quantification.
2Quantity of substance
If Aβ42 peptides are used to form aggregates under certain conditions, then oligomer formation occurs rapidly, but the aggregates are poorly soluble in aqueous solutions
Solution Approach 1:
The aggregation-prone KLVFF sequence is recognized as harmful for solubility, but instead of simply removing it entirely, the invention uses a modified version where the aggregation domain is disrupted through segmentation and linker insertion. This converts the harmful aggregation property into a beneficial solubility property while maintaining the ability to preserve oligomer structures when needed for study, by controlling the peptide design rather than the environmental conditions.
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 use of these modified peptide standards allows for accurate and stable measurement of Aβ42 in biological samples, overcoming the limitations of traditional methods by maintaining monomeric form and stability, thus enhancing the reliability of Aβ42 quantification in clinical settings.
Implementation Method 1
a linker region, wherein the linker region comprises a non-immunoreactive domain
Data Source
AI summary
The present invention provides novel compositions and methods for creating quantitative standards to calibrate analytes. These compositions and methods enable the creation of standards and calibrators for analyzing analytes and measuring clinical biomarkers. Also provided are kits comprising the novel compositions for use in assays, for example sandwich immunoassays.