total synthesis of epidermin solid-phase peptide synthesis solid phase peptide synthesis - Bocsolid phase peptide synthesis solid

Bocsolid phase peptide synthesis The total synthesis of epidermin using solid-phase peptide synthesis (SPPS) represents a significant achievement in medicinal chemistry and drug discovery. Epidermin, a bacteriocin produced by *Staphylococcus epidermidis*, is a cyclic peptide with potent antimicrobial activity against Gram-positive bacteria作者：K Manzor·2017·被引用次数：9—at position 5, have been successfully prepared bysolid-phase peptide synthesis. The Dha replacements include glycine, alanine .... Its complex structure, featuring thioether cross-links and a unique N-terminal lanthionine ring, makes its chemical synthesis a challenging yet rewarding endeavor.Solid Phase Peptide Synthesis. I. The Synthesis of a ... Solid-phase peptide synthesis offers a robust and efficient methodology for constructing such intricate peptide molecules, enabling the exploration of their biological functions and the development of novel therapeutic agents.

The Foundation of Solid-Phase Peptide Synthesis

Solid-phase peptide synthesis (SPPS), pioneered by R.B. Merrifield, revolutionized peptide chemistry by anchoring the growing peptide chain to an insoluble solid support, typically a polymer resin. This strategy simplifies the purification process, as excess reagents and byproducts can be easily washed away after each coupling step.作者：RB Merrifield·1963·被引用次数：13405—GreenSolid-Phase Peptide Synthesis: Oxyma-Triggered Spectrophotometric Monitoring of ResidualPiperidine. Organic Process Research & Development 2024, 28 ... The SPPS cycle involves several key stages: deprotection of the N-terminal amino acid, activation and coupling of the next protected amino acid, and repetitive washing steps. This iterative process allows for the stepwise elongation of the peptide chain until the desired sequence is assembled.

Strategies for Epidermin Synthesis

The total synthesis of epidermin via SPPS requires careful consideration of several factors, including the choice of resin, protecting groups, coupling reagents, and strategies for forming the characteristic thioether cross-links and the N-terminal lanthionine ring.

* Resin Selection: The resin serves as the solid support and dictates the C-terminus of the peptide. For epidermin, a resin that can facilitate cleavage under mild conditions to preserve the integrity of the cyclic structure is often preferred.

* Protecting Groups: Amino acid side chains and the N-terminus require temporary protection to prevent undesired side reactions during peptide coupling. Fmoc (9-fluorenylmethyloxycarbonyl) and Boc (tert-butyloxycarbonyl) are common N-terminal protecting groups, each with its own deprotection reagents and compatibility with different SPPS strategies.

* Coupling Reagents: Efficient coupling of amino acids is crucial for high yields and purity. Various coupling reagents, such as HBTU, HATU, and DIC/HOBt, are employed to activate the carboxyl group of the incoming amino acid, facilitating its reaction with the free amine on the growing peptide chain.

* Thioether and Lanthionine Ring Formation: The unique structural features of epidermin, particularly the thioether cross-links and the lanthionine ring, pose significant synthetic challenges. These complex linkages are typically formed post-assembly on the solid support or after cleavage from the resin, often involving specific cyclization strategies and reagents. For instance, the formation of the lanthionine ring involves the dehydration and cyclization of serine or threonine residues.

Advancements and Applications

Recent advancements in SPPS have focused on improving efficiency, reducing solvent usage, and enabling the synthesis of increasingly complex peptides. Innovations such as wash elimination strategies and automated SPPS platforms have streamlined the synthesis process, making it more accessible and scalable. The ability to synthesize epidermin and its analogs through SPPS opens avenues for exploring their therapeutic potential as novel antibiotics, particularly in the face of rising antibiotic resistance. Furthermore, the total synthesis of naturally occurring peptides like epidermin is essential for elucidating their biological mechanisms, structure-activity relationships, and for producing them in quantities suitable for preclinical and clinical studies.

The successful total synthesis of epidermin via solid-phase peptide synthesis underscores the power and versatility of modern chemical methodologiesThe purpose of this guide is to provide practical information for planning and executing successfulsolid phase peptidesyntheses.. By overcoming the inherent structural complexities of this potent antimicrobial peptide, researchers can unlock its full therapeutic promise and contribute to the ongoing fight against infectious diseases.2012年6月28日—1) Swell the resin in DMF for 30min prior to use to open up some of the more internal coupling sites. In this and all subsequent steps solvent ...