Sequential Polypeptide Digestion for Cleaner Mass Spectrometric Analysis
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Solution Overview
Problem
Conventional multiple enzyme digestion methods for polypeptides result in complex digests with numerous peaks or require separate analysis, complicating the analysis of therapeutic polypeptides using Multi-attribute method (MAM) and other analytical technologies.
Innovation Solution
A sequential enzymatic digestion approach is employed, where polypeptides are cleaved using multiple enzymes in a sequential manner, with molecular weight cutoff filters separating large and small peptides, allowing for a single clean digest that simplifies analysis by combining all peptides into a single peptide map.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple enzymes are used together for digestion, then complete cleavage of polypeptides is improved, but digest complexity increases with too many peaks
Solution Approach 1:
The patent divides the digestion process into sequential stages using different enzymes at different times. First, a protease performs initial cleavage, then after separation, a second enzyme performs further cleavage on the isolated large peptides. This segmentation prevents the simultaneous action of multiple enzymes that would create excessive peak complexity while still achieving complete cleavage through the staged approach.
Solution Approach 2:
The patent applies preliminary action by performing the first enzymatic digestion with a protease before introducing the second enzyme. The large peptides are separated and then subjected to second enzyme treatment. This preliminary digestion step prepares the polypeptides for subsequent analysis while maintaining manageable digest complexity at each stage.
2Reliability
If multiple enzymatic digestions are performed separately, then interference among enzymes is eliminated, but analysis time and process complexity increase
Solution Approach 1:
The patent segments the enzymatic digestion into separate sequential steps with isolation between them. The first enzyme digests the polypeptide, then the large peptides are separated and isolated. The second enzyme is then applied to these isolated large peptides. This segmentation eliminates enzyme interference while consolidating the analysis into a streamlined workflow that reduces overall time compared to fully separate analyses.
Solution Approach 2:
The patent merges the benefits of separate enzymatic digestions (eliminating interference) with a unified analysis approach. After sequential digestion and separation steps, the final peptide mixtures are combined and analyzed together using MAM or other analytical technologies. This merging reduces the number of separate analysis runs needed while maintaining the reliability benefits of sequential enzyme treatment.
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 simplifies the analysis process by reducing peak complexity and enabling efficient analysis of therapeutic polypeptides using MAM and other analytical methods, such as LC/UV peptide mapping.
Implementation Method 1
separating the at least two fragments from each other to produce a first large peptide fragment-containing solution and a first small peptide fragment-containing solution
Implementation Method 2
the cleaving of the polypeptide in the first digestion comprises proteolytic or chemical cleavage
Data Source
AI summary
The disclosed methods are directed to preparing polypeptides for multi-attribute analysis. The polypeptides are optionally denatured, reduced, and/or alkylated before being subjected to a first digestion. Following the first digestion the large and small fragments resulting from the digestion are separated from each other. A second digestion is then performed on the larger of the fragments. All of the fragments from the two digestions are then analyzed chromatographically, electrophoretically, or spectrometrically, or a combination of these methods. The methods are especially useful for the preparation of therapeutic polypeptides for analysis, especially those that are not easily cleaved.