mersacidin total synthesis solid-phase peptide synthesis phase - merck-cyclic-peptide total synthesis of mersacidin The Mersacidin Total Synthesis: A Deep Dive into Solid-Phase Peptide Synthesis

merck-peptides Mersacidin stands as a remarkable example of a lantibiotic, a class of antimicrobial peptides characterized by the presence of lanthionine residues作者：ES Grant-Mackie·2025—this fragment for thetotal synthesis of mersacidin... Solvation and Swelling of Peptide-Containing Resins in Solid-Phase Peptide Synthesis.. Produced by *Bacillus* species, such as *Bacillus sp. strain HIL Y-85,54728*, mersacidin is a 20-amino acid peptide with potent activity against Gram-positive bacteria. Its mechanism of action involves the disruption of bacterial cell wall biosynthesis, specifically by inhibiting peptidoglycan synthesis. This makes mersacidin a valuable target for research into novel antimicrobial agents. Understanding its complex structure and function necessitates advanced synthetic approaches, with the mersacidin total synthesis being a significant endeavor in the field of peptide chemistryThe Total Synthesis of Depsipeptide Antibiotics.

The total synthesis of complex peptides like mersacidin presents considerable challenges due to their intricate post-translational modifications, including the formation of thioether bridges characteristic of lanthionine and methyllanthionine residues. Historically, such syntheses have been meticulously carried out using various chemical strategiesThe Lantibiotic Mersacidin Is an Autoinducing Peptide - PMC. Among these, solid-phase peptide synthesis (SPPS) has emerged as a cornerstone technique, revolutionized by its inventors R.The role of chemical synthesis in developing RiPP antibiotics Bruce Merrifield. This method allows for the sequential addition of amino acids to a growing peptide chain anchored to an insoluble solid support.

The Pillars of Solid-Phase Peptide Synthesis for Mersacidin

Solid-phase peptide synthesis offers distinct advantages for the total synthesis of mersacidin and other complex peptides. The core principle involves immobilizing the C-terminal amino acid onto a resin, such as polystyrene or polyethylene glycol, typically via a linker. Subsequent amino acids, protected at their N-terminus (commonly with Fmoc or Boc groups) and activated at their carboxyl group, are then coupled to the free N-terminus of the growing chain. Each coupling step is followed by a deprotection step to remove the N-terminal protecting group, thus exposing a new amine for the next coupling.

Key to successful SPPS are the choice of protecting groups, coupling reagents, and the solid-phase peptide synthesis techniques employed. For instance, the Fmoc (9-fluorenylmethyloxycarbonyl) strategy is widely adopted due to its mild cleavage conditions, which are compatible with acid-labile side-chain protecting groups. Common coupling reagents include carbodiimides like DIC (N,N'-diisopropylcarbodiimide) in combination with activators such as HOBt (hydroxybenzotriazole) or Oxyma Pure. The efficient synthesis of modified amino acids and their subsequent incorporation into the peptide sequence are critical for constructing the unique structure of mersacidin.Molecular Recognition of Lipid II by Lantibiotics - UCL Discovery Researchers have explored various modifications of standard solid phase peptide synthesis to accommodate the specific requirements of lanthipeptide synthesis, including the development of orthogonally protected lanthionines suitable for SPPS.

Beyond Standard SPPS: Innovations in Mersacidin Synthesis

The construction of the lanthionine rings within mersacidin requires specific chemical transformations[41,42] We have developed very effectivesolid-phase peptides ynthesismethodology which we and others have appliedtothe synthesis of individual rings of .... These often involve the dehydration of serine or threonine residues to form dehydroalanine or dehydrobutyrine, followed by a Michael addition of a cysteine thiol. Achieving stereoselectivity and preventing unwanted side reactions during these cyclization steps are crucial aspects of the mersacidin total synthesisFundamental functionality: recent developments in .... To overcome these hurdles, advanced solid-phase peptide synthesis strategies have been developed, including the use of specific linker chemistries and innovative coupling and cyclization protocols. For example, strategies for the synthesis of lanthionine-containing peptides have been refined through solid-phase peptide synthesis and ring-closing metathesis.

The total syntheses of analogous peptides, such as total syntheses of malacidin A, and other related lantibiotics like epilancin 15X, have also benefited from advancements in SPPS. These studies provide valuable insights and methodologies that can be directly applied to the total synthesis of mersacidin. The ability to rationally design and synthesize analogues of mersacidin is also a significant outcome of these synthetic efforts. Such analogues can be used to probe structure-activity relationships, potentially leading to the development of novel antimicrobial agents with improved properties作者：RS Narayan·2005·被引用次数：87—As part of our research effort directed toward thesynthesisand mechanistic study of the lantibioticpeptide mersacidin(1), we report stereoselective ....

The Significance of Total Synthesis in Peptide Research

The total synthesis of peptide mersacidin is not merely an academic exercise.作者：H Liu·2010·被引用次数：1—The preliminary biological evaluation suggests that the oxygen analogue (45) displays the inherent activity of the parentpeptide, but lacks the synergistic ... It provides an independent and highly controlled method for obtaining pure and well-characterized mersacidin. This is essential for detailed biological studies, including elucidating its mechanism of action at a molecular level, understanding its interactions with lipid II (the precursor to the bacterial cell wall), and investigating its potential as a therapeutic agent. Furthermore, the total synthesis allows for the creation of specific modifications or analogs that are not readily accessible through biological production. This capability is vital for developing new antibiotics to combat the growing threat of antimicrobial resistance.Mersacidin - an overview

While biological production methods exist, solid-phase peptide synthesis and other chemical approaches like liquid-phase synthesis remain indispensable for accessing a wide array of peptides, including those with non-proteinogenic amino acids and complex modificationsThe Lantibiotic Mersacidin Inhibits Peptidoglycan Synthesis by .... The exploration of total chemical synthesis of a glycoprotein by native chemical ligation, though a different class of biomolecule, highlights the power and versatility of chemical synthesis in constructing complex biological structuresMolecular Recognition of Lipid II by Lantibiotics - UCL Discovery. The total synthesis of the lantibiotic lactocin S using peptide cyclizations is another example underscoring the importance of synthetic approaches in this field.

In conclusion, the mersacidin total synthesis represents a significant achievement in the complex world of peptide chemistryhttps://knepublishing.com/index.php/KnE-Life/artic.... Leveraging sophisticated solid-phase peptide synthesis techniques and continuous innovation in synthetic methodology, researchers are not only unlocking the secrets of this potent antimicrobial peptide but also paving the way for the discovery and development of new therapeutic strategies against bacterial infections.The Total Synthesis of Depsipeptide Antibiotics The ability to precisely engineer peptides like mersacidin on a solid phase underscores the enduring power of chemical synthesis in advancing biological and medical science.