Competitive Binding LC-MS for Biologic Variant Identification
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Solution Overview
Problem
Current methods for identifying critical quality attributes (CQAs) in biologics, such as therapeutic monoclonal antibodies, are inefficient and low-throughput, requiring laborious enrichment and evaluation of product-related impurities, which complicates the characterization of quality control attributes and impacts product purity and stability.
Innovation Solution
A competitive binding-LC-MS method is developed, where a protein of interest is contacted with an insufficient amount of a capture molecule, and the flow-through is subjected to separation and quantification using ion exchange chromatography and mass spectrometry, allowing for the comparison of variant abundance between the flow-through and a control sample to identify product-related variants with impaired binding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional enrichment and evaluation methods are used for product-related impurities, then identification accuracy is improved, but throughput is reduced and process complexity increases
Solution Approach 1:
The patent combines enrichment and evaluation into a single competitive binding-LC-MS workflow. The competitive binding step enriches variants with impaired binding in the flow-through, while LC-MS simultaneously separates and quantifies multiple variants. This merging eliminates the need for separate enrichment and evaluation steps, achieving both high identification accuracy and high throughput.
Solution Approach 2:
The competitive binding-LC-MS method serves multiple functions simultaneously: it enriches variants with impaired binding, separates multiple product-related variants, and quantifies their abundance in a single integrated workflow. This multi-functionality allows the method to maintain high identification accuracy while achieving high throughput by eliminating the need for multiple sequential steps.
2Measurement precision
If traditional enrichment and evaluation methods are used for product-related impurities, then identification accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple separate processes (enrichment, separation, and evaluation) into a single integrated competitive binding-LC-MS workflow. This reduces device complexity by eliminating the need for multiple separate instruments and procedures while maintaining identification accuracy through the combined capabilities of the integrated system.
Solution Approach 2:
The competitive binding-LC-MS method performs multiple functions (enrichment, separation, and quantification) within a single unified platform. This multi-functionality reduces process complexity by eliminating the need for multiple separate devices and procedures, while still achieving high identification accuracy through the integrated workflow.
3Measurement precision
If individual evaluation of product-related CQAs is performed, then measurement precision is improved, but productivity is reduced
Solution Approach 1:
The LC-MS system evaluates multiple product-related CQAs simultaneously in a single run. The method can detect and quantify various types of variants (aggregates, fragments, post-translational modifications, charge variants) concurrently, maintaining measurement precision for each individual CQA while achieving high throughput by eliminating the need for sequential individual evaluations.
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 method enables high-throughput identification of potential CQAs, simplifying the enrichment process and allowing for simultaneous assessment of multiple attributes, thereby improving the characterization of binding-related CQAs and reducing the complexity of evaluating product-related impurities.
Implementation Method 1
contacting said sample to a competitive binding condition including an insufficient target immobilized on beads
Implementation Method 2
subjecting said flow-through to liquid chromatography-mass spectrometry analysis to separate said protein of interest and said at least one product-related variant
Implementation Method 3
quantification, for example using UV detection and/or mass spectrometry
Data Source
AI summary
The present invention relates to the field of protein characterization, and in particular to methods for identifying critical quality attributes of therapeutic proteins by implementing a workflow including using a competitive binding assay with insufficient capture molecule followed by LC-MS.