Protein Off-Target Binding ELISA for Clearance Prediction
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Solution Overview
Problem
Existing methods for detecting off-target binding of proteins are time-consuming and low throughput, and there is a need for improved sensitivity and correlation with in vivo clearance.
Innovation Solution
A method using ELISA assays with polyethyleneimine (PEI) or membrane preparation (MEM) coating to detect off-target binding, which involves coating a vessel with PEI or MEM and measuring protein binding, with a higher binding indicating increased clearance or half-life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional analytical techniques (SEC, HIC, IEX, CE, DSC, DSF, FT-IR, FT-Raman, NMR, CD, DLS, rheology, MS, MS/MS) are used to detect off-target binding, then measurement precision is improved, but productivity deteriorates due to time-consuming manual procedures and low throughput
Solution Approach 1:
The patent uses ELISA assays as a simplified copy or surrogate method to detect off-target binding properties. Instead of performing multiple complex analytical techniques, the invention creates a representative assay using PEI or membrane preparations that replicates the essential information about protein clearance risk, thereby achieving high throughput while maintaining predictive accuracy
Solution Approach 2:
The invention extracts the critical function of off-target binding detection from the complex suite of analytical techniques. By isolating and amplifying the specific signal relevant to clearance prediction through ELISA with PEI/MEM coatings, the method removes unnecessary complexity while retaining the essential predictive capability
2Measurement precision
If traditional analytical techniques are used, then measurement precision is improved, but loss of time increases due to manual operations
Solution Approach 1:
The ELISA assay serves as a time-efficient copy of the full analytical characterization process. It replicates the essential predictive information about off-target binding and clearance risk in a single, rapid assay, eliminating the need for time-consuming sequential manual analyses while maintaining measurement precision
Solution Approach 2:
The patent performs preliminary action by using ELISA screening to identify proteins with off-target binding risk before committing to more time-consuming confirmatory analyses. This preliminary detection step filters candidates efficiently, reducing overall analysis time while preserving the ability to make accurate predictions about in vivo clearance
3Productivity
If baculovirus particles (BVP)-based ELISA assay is used, then productivity is improved compared to traditional methods, but measurement precision deteriorates with reduced sensitivity and correlation with clearance
Solution Approach 1:
The patent applies parameter changes by substituting the coating substrate from baculovirus particles to polyethyleneimine (PEI) or membrane preparations. This parameter change in the assay system dramatically improves both sensitivity and correlation with in vivo clearance while maintaining high throughput, resolving the contradiction between productivity and measurement precision
Solution Approach 2:
The invention uses disposable PEI or membrane preparation coatings instead of complex, expensive baculovirus particles. These simpler, more stable coatings provide superior sensitivity and clearance correlation while being easier to handle and store, improving both measurement precision and operational efficiency
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 provides a faster and more efficient way to predict in vivo clearance and half-life of proteins, showing a strong correlation with pharmacokinetics through ELISA assays using PEI or MEM as coating substrates.
Implementation Method 1
binding is detected by reading absorbance at 450 nm
Implementation Method 2
detecting off-target binding of proteins such as antibodies
Data Source
AI summary
The present invention relates to methods of detecting off-target binding of proteins such as antibodies. Said methods are useful in identifying proteins that are likely to have more rapid clearance in vivo compared to proteins that do not have (or they have less) off-target binding.