Cyclic Peptide Synthesis via Enzymatic Cyclization
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Solution Overview
Problem
There is a need for new methods to produce cyclic peptides, particularly for clinical investigations and therapeutic use, as well as for the production of cyclic peptide libraries that can be screened to identify peptides with desired activity, due to challenges in supplying marine invertebrate-derived bioactive compounds and the complexity of synthesizing small, cyclic peptides.
Innovation Solution
The development of methods for the in vivo construction of cyclic peptide libraries that are enzymatically cyclized at the C—N terminus, using the patellamide biosynthetic gene cluster and recognition sequences to cyclize peptides, allowing for the production of diverse cyclic peptides in E. coli.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If marine invertebrates are collected or aquacultured to obtain bioactive compounds, then the supply of natural products is improved, but environmental acceptability and practical feasibility deteriorate
Solution Approach 1:
The patent creates synthetic copies of marine invertebrate-derived cyclic peptides through heterologous expression of biosynthetic gene clusters in E. coli. The patellamide biosynthetic gene cluster from Prochloron didemni was cloned and expressed in E. coli, producing patellamides A and C without requiring collection of marine invertebrates or their symbiotic bacteria.
Solution Approach 2:
The patent uses E. coli as an intermediary host organism to produce the bioactive compounds. The symbiotic cyanobacteria Prochloron sp. that normally live in marine invertebrates were cultured, their biosynthetic genes were identified and transferred to E. coli, which then serves as a mediator to produce the compounds in a controlled, environmentally acceptable manner.
2Ease of manufacture
If cyclic peptides are synthesized using traditional chemical methods, then production is achieved, but synthesis complexity and time consumption increase
Solution Approach 1:
The patent replaces complex chemical synthesis mechanisms with biological enzymatic mechanisms. Instead of using multiple chemical reagents and complex reaction conditions to form cyclic peptides, the system uses engineered biosynthetic pathways with enzymes that naturally catalyze the cyclization reactions, significantly simplifying the manufacturing process.
Solution Approach 2:
The patent incorporates recognition sequences upstream of the coding sequence that direct the biosynthetic machinery to perform preliminary processing steps. The PatG protease recognizes specific sequences to cleave and cyclize the peptide, and PatF oxidase performs preliminary oxidation of thiols to disulfides, automating the synthesis process before final product formation.
3Adaptability or versatility
If cyclic peptide libraries are produced for screening, then diverse peptides can be identified, but production scale and time requirements increase
Solution Approach 1:
The patent created a universal biosynthetic platform that can produce diverse cyclic peptides by simply changing the coding sequence between the recognition sequences. The same PatG protease and PatF oxidase system can cyclize different peptide sequences, allowing rapid production of libraries with diverse sequences and functions without re-engineering the entire biosynthetic pathway.
Solution Approach 2:
The patent segmented the biosynthetic pathway into modular components: recognition sequences that define the boundaries, a variable coding sequence that determines peptide diversity, and fixed biosynthetic genes (patG, patF) that perform the cyclization. This segmentation allows independent optimization and rapid assembly of different peptide variants for library 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
This approach enables the rapid construction of C—N terminally amide-linked cyclic peptides on a reasonable scale, facilitating biochemical analysis and providing a means to produce prenylated peptide libraries, with potential applications in drug discovery and clinical use.
Implementation Method 1
The peptide is cleaved to yield the two cyclic patellamides, A and C
Implementation Method 2
The primary sequence of patellamides A and C is encoded on a single open reading frame that resembles a precursor peptide. This pre-patellamide is heterocyclized to form thiazole and oxazoline rings
Data Source
AI summary
Disclosed are compositions and methods for cyclization of polymers such as peptides.