solid-phase peptide synthesis duramycin total synthesis duramycin's - peptide-serum-pregnancy-safe solid

solid-phase-peptide-synthesis-is-also-known-as Solid-Phase Peptide Synthesis and the Total Synthesis of Duramycin

Solid-phase peptide synthesis (SPPS) is a cornerstone technique in modern organic chemistry, enabling the efficient construction of peptides by sequentially adding amino acid building blocks onto a solid support. This method has revolutionized peptide research and production, allowing for the creation of complex peptides, including those with therapeutic potential. A prime example of the power and intricacy of SPPS is its application in the total synthesis of natural products like duramycin, a potent lantibiotic antimicrobial peptide. Understanding the principles of SPPS is crucial for appreciating the challenges and achievements in synthesizing such complex molecules.

The Mechanics of Solid-Phase Peptide Synthesis

At its core, solid-phase peptide synthesis involves immobilizing the C-terminus of a growing peptide chain to an insoluble resin bead. This immobilization simplifies the process by allowing excess reagents and byproducts to be washed away after each coupling stepSolid-phase peptide synthesis: from standard procedures .... The synthesis proceeds in a stepwise fashion:

1. Attachment to the Resin: The first amino acid, with its amino group protected, is attached to the solid support.

2Bacteriocins as natural weapon against cancer: in vitro, in vivo .... Deprotection: The protecting group on the amino terminus of the immobilized amino acid is removed, exposing a free amine.

3. Coupling: The next protected amino acid is activated and coupled to the free amine of the growing peptide chain.

4. Washing: Excess reagents and byproducts are washed away.

5. Repeat: Steps 2-4 are repeated for each subsequent amino acid until the desired peptide sequence is assembled.

6. Cleavage: Finally, the completed peptide is cleaved from the solid support, and any remaining side-chain protecting groups are removed.

Common strategies for managing protecting groups include the Fmoc (9-fluorenylmethoxycarbonyl) and Boc (tert-butyloxycarbonyl) chemistries, each with its own set of reagents and deprotection conditions. Fmoc-based SPPS, often employing a tBu (tert-butyl) strategy for side-chain protection, is widely used due to its mild deprotection conditions.

Duramycin: A Complex Lantibiotic Target

Duramycin is a complex class I lantibiotic, a group of ribosomally synthesized and post-translationally modified peptides characterized by the presence of lanthionine and/or methyllanthionine residues2023年6月5日—SPPS is a method used to create peptidesby assembling amino acids in a stepwise fashion on a solid support, such as a resin.. These unique thioether amino acids, formed through dehydration and cyclization of serine and cysteine residues, confer significant structural rigidity and antimicrobial activity. Duramycin, in particular, has garnered attention for its potent activity against a range of Gram-positive bacteria and its potential clinical applications, including its advancement to Phase II trials.

The intricate structure of duramycin, featuring multiple thioether bridges and modified amino acids, presents a formidable challenge for chemical synthesis. The total synthesis of duramycin necessitates not only the precise assembly of the linear peptide chain but also the successful formation of these complex cross-links, which are typically generated through specific enzymatic modifications during biosynthesis.

Total Synthesis of Duramycin via SPPS

The total synthesis of duramycin, often achieved through Fmoc-based solid-phase peptide synthesis, highlights the advanced capabilities of modern synthetic chemistry.作者：X Wang·2024·被引用次数：7—This review evaluatesduramycin, a lantibiotic antimicrobialpeptide... We assessduramycin'sclinical progress, particularly its advancement toPhaseII ... This process involves:

* Stepwise Assembly: The linear peptide sequence of duramycin is painstakingly built on a solid support, amino acid by amino acid, using established SPPS protocolsThe resin is drawn as a carbocation and the amino acid is drawn as a carboxylate to ease explanation of chemistry. 1. Weigh out appropriate amount of resin..

* Incorporation of Modified Residues: The synthesis must accommodate the incorporation of non-canonical amino acids or the precursors that will be modified post-synthesis to form the characteristic lanthionine structuressolid phase peptide synthesis. This might involve specialized building blocks or strategic placement of residues amenable to cyclization.Multimodal Molecular Imaging Strategies using ...

* Cyclization and Lanthionine Formation: A critical step in the total synthesis is the formation of the thioether bridges. This can be achieved through chemical methods that mimic the natural biosynthetic pathways or through other cyclization strategies. The precise control over these reactions is paramount to achieving the correct stereochemistry and connectivity of the lanthionine rings.作者：Y Fu·2023·被引用次数：15—We report a class I lanthipeptide biosynthetic gene cluster (lanBTC) in a Bacillus strain, involved in the biosynthesis of a novel lanthipeptide that we termed ...

* Cleavage and Purification: Once the complete structure is assembled on the resin, the peptide is cleaved and rigorously purified using techniques such as high-performance liquid chromatography (HPLC)2025年8月7日—...total synthesis via Fmoc-solid-phase peptide synthesis(SPPS). The key non-canonical (methyl)lanthionine residues were synthesized in ....

The successful total synthesis of duramycin via SPPS represents a significant scientific achievement, demonstrating the ability to replicate complex natural products and providing access to these valuable compounds for further study and therapeutic development. It underscores the ongoing synergy between understanding natural biosynthetic pathways and developing sophisticated chemical synthesis methods.