solid-phase peptide synthesis of mersacidin phase synthesis - is-epo-a-peptide peptide synthesis

solid-phase-peptide-synthesis-mersacidin Mersacidin is a potent lantibiotic that exhibits significant activity against Gram-positive bacteria, including methicillin-resistant *Staphylococcus aureus* (MRSA). The primary focus of research and development concerning mersacidin has been its chemical synthesis, particularly employing solid-phase peptide synthesis (SPPS). This method offers distinct advantages over traditional solution-phase techniques for constructing complex peptides like mersacidin, which is characterized by its unique structure featuring multiple thioether bridges and non-canonical amino acids作者：EL Ongey·2016·被引用次数：138—These achievements opened exciting opportunities forsolid-phase peptide synthesis(SPPS) of lanthipeptides (Fig. 4a2), since it was now .... Understanding the intricacies of solid-phase peptide synthesis of mersacidin is crucial for its potential therapeutic applications and for advancing the field of complex peptide chemistry.

The Significance of Solid-Phase Peptide Synthesis for Mersacidin

Solid-phase peptide synthesis revolutionized peptide chemistry by immobilizing the growing peptide chain onto a solid support (resin)Epimerisation in Peptide Synthesis. This approach simplifies purification, as excess reagents and byproducts can be washed away, allowing for efficient coupling and deprotection steps.作者：S Duengo·2023·被引用次数：27—By comparison, MeLeu and MeIle were successfully linked onto unmethylated amino acids when the typical Fmoc-basedSolid Phase Peptide Synthesis(SPPS) procedure ... For a molecule as complex as mersacidin, which contains lanthionine rings and other modified amino acids, SPPS provides a more manageable and often higher-yielding route compared to solution-phase methods. The ability to automate SPPS further enhances its utility for producing mersacidin and its analogs.

Key Components and Challenges in Mersacidin Synthesis

The successful synthesis of mersacidin via SPPS hinges on several key factors:

* Resin Selection: The choice of resin is critical and depends on the desired cleavage conditions and the nature of the peptide. Resins functionalized with linkers that are stable under coupling and deprotection steps but cleavable under specific conditions (e.g., acidolysis) are commonly employed.

* Amino Acid Protection: Orthogonal protection strategies are essential. The alpha-amino group is typically protected with a base-labile group, such as Fmoc (9-fluorenylmethoxycarbonyl), while side chains require acid-labile protecting groupsScheme 3 Fmoc-solid-phase peptide synthesis of tikitericin .... The presence of modified amino acids, such as $\beta$-methylcysteine and $\beta$-methyllanthionine, necessitates specialized protection schemes to prevent unwanted side reactions.

* Coupling Reagents: Efficient coupling of amino acids is paramount to minimize deletion sequences and racemization. Various coupling reagents, such as HBTU, HATU, or DIC/HOBt, are used to activate the incoming amino acid for amide bond formation.

* Lanthionine Ring Formation: The formation of the characteristic lanthionine rings, which involve thioether bridges, is a defining feature of mersacidin's structure. This cyclization process can occur post-translationally in biosynthesis, but in chemical synthesis, it often requires specific cyclization strategies, either on-resin or in solution after cleavage, employing reagents that promote nucleophilic attack of thiol groups onto dehydroamino acids.

* Cleavage and Purification: After the peptide chain is assembled on the resin, it is cleaved from the support using appropriate reagents, typically strong acids.作者：JH Viel·2021·被引用次数：14—The ribosomally synthesized and post-translationally modifiedpeptide mersacidinis a class II lanthipeptide with good activity against Gram-positive bacteria. The crude peptide then requires rigorous purification, usually by High-Performance Liquid Chromatography (HPLC), to isolate the target mersacidin with high purity.Lanthipeptides: chemical synthesis versus in vivo biosynthesis ...

Analogues and Future Directions

Research into the synthesis of mersacidin has also extended to creating analogues with modified structures to explore structure-activity relationships and potentially enhance its therapeutic properties. The development of stereoselective syntheses for non-natural amino acids like $\beta$-methylcysteine and $\beta$-methyllanthionine has been a significant enabler in this area.2022年11月23日—Solid-phase peptide synthesis. To date,solid-phase peptide synthesis(SPPS) is the major chemical strategy forpeptide synthesis(44–46). These synthetic efforts aim to create more potent, stable, or selective antimicrobial agents, leveraging the foundational knowledge gained from the solid phase peptide synthesis of the parent molecule.

In conclusion, the solid-phase peptide synthesis of mersacidin represents a sophisticated application of modern peptide chemistry. It addresses the inherent challenges posed by the lantibiotic's complex structure, enabling its study and the exploration of its derivatives.Mutational Studies of the Mersacidin Leader Reveal the ... Continued advancements in SPPS methodologies and the synthesis of non-canonical amino acids will undoubtedly facilitate the development of mersacidin and other valuable peptide-based therapeutics作者：JH Viel·2022·被引用次数：12—The class II lanthipeptidemersacidin, a ribosomally synthesized and post-translationally modifiedpeptide(RiPP), displays unique ....