Online PTM Monitoring via Flow Injection Peptide Mapping
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Solution Overview
Problem
Conventional methods for analyzing post-translational modifications (PTMs) of recombinantly produced proteins are time-consuming and require offline analysis, leading to delays and increased costs, as they are typically performed at the end of the cell culture process, resulting in aggregate results that necessitate repeating the entire process if specifications are not met.
Innovation Solution
An automated method using a flow injection analyzer (FIA) controlled by a processor for real-time monitoring of PTMs, involving sample processing steps such as affinity column interaction, elution, protein concentration determination, enzymatic digestion, and peptide mapping with mass spectrometry to detect PTMs during cell culture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional offline analysis methods are used for PTM detection, then measurement precision is achieved, but loss of time increases significantly
Solution Approach 1:
The system performs preliminary actions by implementing automated sample preparation, concentration, and analysis steps before final detection. The flow injection analysis system pre-concentrates samples and automates digestion protocols, enabling rapid PTM detection within hours rather than days, thus reducing turnaround time while maintaining precision
Solution Approach 2:
Manual mechanical operations are replaced with automated flow injection analysis systems that use fluid dynamics and automated sampling. The system substitutes manual sample handling with automated liquid chromatography and mass spectrometry interfaces, dramatically reducing analysis time while preserving measurement accuracy
2Productivity
If automated flow injection analysis is implemented for real-time monitoring, then productivity increases, but device complexity increases
Solution Approach 1:
The flow injection analysis system is designed as a multi-functional platform that integrates sample concentration, automated digestion, peptide separation, and mass spectrometry detection. This universal system handles multiple PTM types (phosphorylation, glycosylation, acetylation) through a single automated interface, improving productivity while managing complexity through functional integration
Solution Approach 2:
The system uses an intermediary flow injection analysis platform that mediates between sample introduction and mass spectrometry detection. This intermediary system automates sample preparation and chromatographic separation, enabling real-time monitoring capability while managing device complexity through modular architecture
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 real-time characterization of PTMs, allowing for immediate adjustments to manufacturing parameters, reducing turnaround time and costs by providing immediate feedback for maintaining product specifications.
Implementation Method 1
transferring, via the FIA, the first sample from the holding reservoir to the affinity column
Implementation Method 2
delivering, via the FIA, a first volume of an elution buffer to the affinity column and thereby eluting the protein in the first sample from the affinity column
Implementation Method 3
delivering, via the FIA, a digestion reagent to digest the protein in the second eluate to form a peptide mixture
Implementation Method 4
transferring, via the FIA, the peptide mixture to a peptide mapping unit and detecting the post-translational modification of the protein
Data Source
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AI summary
Provided herein is a method and system for monitoring a post- translational modification and glycosylation of a polypeptide, and in particular, to an online i.e. automated method for real-time monitoring of a post-translational modification of a recombinant protein produced in cell culture. The methods and systems to detect and quantify post-translational modifications of proteins involve flow injection analysis (FIA), affinity columns, spectrometry, digestion and peptide mapping.