Flow Native Chemical Ligation for Scalable Polypeptide Synthesis
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Solution Overview
Problem
Existing methods for synthesizing peptides and proteins, such as solid phase peptide synthesis and native chemical ligation, are limited in size and scalability, lacking the efficiency and robustness required for the rapid and facile preparation of pharmaceuticals.
Innovation Solution
A method involving the reaction of an ester with a molecule containing a terminal amino acid, such as cysteine or selenocysteine, in the presence of a reactive ester or thiol/selenol additive, conducted in flow, allowing for the synthesis of amides and subsequent desulfurization or deselenization using UV irradiation and phosphine sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If solid phase peptide synthesis or native chemical ligation is used to synthesize peptides and proteins, then the synthesis can be performed with existing methods, but the size of targets that can be produced is limited and scalability is poor
Solution Approach 1:
The patent applies segmentation by dividing the synthesis process into modular flow reaction steps, where peptide fragments are synthesized and ligated in a stepwise manner through controlled flow conditions. This enables scalable production while maintaining synthesis precision by allowing each reaction step to be optimized independently.
Solution Approach 2:
The patent transitions from traditional batch or solid-phase synthesis to flow chemistry, adding the dimension of continuous processing. This dimensional change enables scalable production while maintaining the precision of native chemical ligation through controlled flow conditions and residence times.
2Manufacturing precision
If existing peptide synthesis methods are used, then the synthesis can be performed, but the preparation is not rapid or facile enough for pharmaceutical production
Solution Approach 1:
The patent implements continuous flow synthesis where reactants continuously flow through reaction zones, eliminating idle time between steps. This continuous action maintains synthesis feasibility while dramatically reducing preparation time compared to batch methods, enabling rapid pharmaceutical production.
Solution Approach 2:
The patent performs preliminary actions by pre-mixing reagents and optimizing reaction conditions before the actual synthesis. Flow channels are designed with pre-reaction zones that prepare reactants in advance, reducing the time required during the actual synthesis phase and enabling rapid preparation.
3Manufacturing precision
If existing synthesis methods are used, then the synthesis can be performed, but the methods lack the efficiency and robustness required for pharmaceutical manufacturing
Solution Approach 1:
The patent changes critical parameters by transitioning from batch to flow conditions, controlling temperature, pressure, and residence time precisely. This maintains synthesis accuracy while dramatically improving manufacturing efficiency and robustness, making the process suitable for pharmaceutical manufacturing.
Solution Approach 2:
The patent replaces manual batch operation mechanics with automated flow control systems. This substitution maintains synthesis accuracy through precise control while improving manufacturing efficiency and robustness, enabling scalable pharmaceutical production.
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 the rapid, clean, and scalable synthesis of amides, particularly polypeptides, overcoming size limitations and enhancing the production of therapeutic polypeptides.
Implementation Method 1
Native chemical ligation (NCL), a transformative technology that enables convergent and chemoselective fusion of unprotected peptide fragments
Implementation Method 2
the reaction proceeds through an initial trans-thioesterification step followed by a rapid S→N acyl rearrangement to afford a native peptide bond
Implementation Method 3
subsequent desulfurization chemistry
Implementation Method 4
later a milder radical-based protocol that facilitate the conversion of the least abundant proteinogenic amino acid Cys to an alanine (Ala) residue
Data Source
AI summary
The disclosure relates to the synthesis of amide containing compounds in flow. In particular, the disclosure relates to the synthesis of polypeptides via native chemical ligation in flow. The disclosure also relates to selective desulfurization or deselenization of amide containing compounds comprising a thiol, disulfide, selenol or diselenide functional group respectively, particularly polypeptides.