Enzymatic C-Terminal Ester Interconversion for Peptide Synthesis
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Solution Overview
Problem
Current peptide synthesis methods, particularly in the N→C terminal direction, require multiple steps for C-terminal deprotection and activation, which are costly, environmentally unfriendly, and prone to side reactions, limiting the efficiency and flexibility of peptide synthesis.
Innovation Solution
A method involving the use of a hydrolytic enzyme for transesterification of a C-terminal t-alkyl ester to form an activated ester, allowing for peptide coupling without the need for separate deprotection and activation steps, using enzymes like subtilisin Carlsberg to catalyze both transesterification and peptidic bond formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple separate steps for C-terminal deprotection and activation are used, then the peptide synthesis can be completed, but the process complexity and cost increase
Solution Approach 1:
The patent combines C-terminal deprotection and activation into a single enzymatic transesterification step using hydrolytic enzymes. Instead of performing separate chemical deprotection followed by separate activation steps, the enzyme catalyzes the direct conversion of C-terminal protected groups to activated esters in one operation, thereby reducing process complexity while maintaining synthesis efficiency
Solution Approach 2:
The hydrolytic enzyme serves multiple functions simultaneously: it acts as both a deprotecting agent (removing C-terminal protecting groups) and an activating agent (generating activated esters for peptide coupling). This multi-functionality eliminates the need for separate reagents and steps for deprotection and activation, streamlining the overall peptide synthesis process
2Reliability
If multiple separate steps for C-terminal deprotection and activation are used, then the peptide synthesis can be completed, but the environmental impact worsens and side reactions increase
Solution Approach 1:
The patent replaces traditional chemical reagents and multi-step chemical processes with an enzymatic system. The hydrolytic enzyme catalyzes the transesterification reaction under mild conditions, avoiding the use of harsh chemicals and toxic reagents that cause environmental pollution and side reactions. This biochemical substitution improves peptide purity while reducing harmful environmental impacts
Solution Approach 2:
The hydrolytic enzyme acts as a biocatalytic intermediary that facilitates the conversion of C-terminal protected groups to activated esters. This enzymatic intermediary enables the reaction to proceed under mild, selective conditions, avoiding the harsh chemical conditions that lead to side reactions and environmental pollution, thereby improving overall process reliability and purity
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 approach simplifies peptide synthesis by combining deprotection and activation in a single enzymatic step, increasing yield and reducing the number of reaction steps, making the process more attractive and environmentally friendly.
Implementation Method 1
the use of a hydrolytic enzyme for transesterification of a C-terminal t-alkyl ester to form an activated ester
Implementation Method 2
transesterification of a C-terminal t-alkyl ester to form an activated ester
Implementation Method 3
using enzymes like subtilisin Carlsberg to catalyze both transesterification and peptidic bond formation
Data Source
AI summary
The invention relates to a method for preparing an optionally N-protected amino acid C-terminal ester or an optionally N-protected peptide C-terminal ester, comprising transesterifying the C-terminal t-alkyl ester of the amino acid or the C-terminal t-alkyl ester of the peptide with an alcohol (other than the t-alcohol corresponding to the t-alkyl group of the ester) in the presence of a hydrolytic enzyme (E.C. 3).The invention further relates to a method for preparing a peptide comprising coupling an activated, N-protected, amino acid C-terminal ester or an optionally N-protected peptide C-terminal ester with an optionally C-terminal protected amino acid or an optionally C-terminal protected peptide via a peptide bond, in the presence of an enzyme catalysing peptidic bond formation.