APRIL-Binding Peptides for Serum Detection
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Solution Overview
Problem
Current assays for detecting APRIL in human serum are limited by the use of ill-defined polyclonal antibodies, which do not accurately reproduce APRIL levels and are heavily impacted by the presence of human serum, requiring additional steps like Immunoglobulin absorption and demonstrating limited detection limits.
Innovation Solution
Development of methods to select APRIL-binding peptides using a library of binder peptides through affinity selection with a target peptide immobilized on a solid support, comprising APRIL epitopes and receptor-binding regions, allowing for the isolation of APRIL-binding peptides that can detect APRIL in serum samples without interference from human serum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If polyclonal antibodies are used for detecting APRIL in human serum, then the assay can detect APRIL, but the detection accuracy is reduced due to interference from human serum components and the need for additional Immunoglobulin absorption steps
Solution Approach 1:
The patent extracts the harmful interference from human serum by using a solid support that selectively binds APRIL, separating it from other serum components. The affinity selection process isolates APRIL-binding peptides from the complex serum matrix, eliminating the need for Immunoglobulin absorption steps and other complex preparatory procedures.
Solution Approach 2:
The patent introduces an intermediary solid support with immobilized APRIL or APRIL-like structures that mediates the detection process. This intermediary selectively captures APRIL from serum samples, enabling accurate detection without direct interference from other serum components, and eliminates the need for polyclonal antibodies that require complex handling.
2Measurement precision
If polyclonal antibodies are used for APRIL detection, then the assay can be performed, but the detection limit is limited and requires additional Immunoglobulin absorption steps
Solution Approach 1:
The solid support extracts and concentrates APRIL from serum samples through affinity binding, achieving lower detection limits without requiring Immunoglobulin absorption steps. The direct affinity capture simplifies the操作流程 while improving sensitivity.
Solution Approach 2:
The patent uses APRIL-like structures or epitopes immobilized on the solid support as copies of the target antigen. These copies enable specific detection of APRIL with high sensitivity and simplicity, replacing the need for complex polyclonal antibody-based assays.
3Reliability
If a library of binder peptides is used for affinity selection, then APRIL-binding peptides with improved specificity can be obtained, but the selection process requires immobilization on solid support and multiple washing steps
Solution Approach 1:
The patent segments the binder peptide library into individual peptides displayed on separate solid support particles or wells. This segmentation enables parallel affinity selection of multiple peptides simultaneously, improving throughput and specificity while managing the complexity of the selection process through modular organization.
Solution Approach 2:
The affinity selection process is designed to be self-discriminating: peptides that do not bind APRIL are automatically eliminated during washing steps, while specific binders are retained and enriched. This self-service mechanism improves specificity without requiring complex external control systems.
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 method enables the identification and isolation of APRIL-binding peptides that effectively detect APRIL in human serum samples with improved specificity and sensitivity, overcoming the limitations of existing assays by reducing interference from human serum components.
Implementation Method 1
selecting APRIL-binding peptides from the library by means of affinity selection using a target peptide immobilized on a solid support
Data Source
AI summary
The invention relates to a method for obtaining APRIL-binding peptides. With this method APRIL-binding peptides may be obtained and/or selected. Further aspects of the invention relate to a cell comprising a nucleotide sequence coding for an APRIL-binding peptide according to the invention, a process for producing an APRIL-binding peptide and the APRIL-binding peptide obtainable in the production process and/or the selection method. In view of the possible utility of the APRIL-binding peptides according to the invention, further aspects of the invention relate to diagnostic uses of an APRIL binding peptide of the invention.