mersacidin total synthesis solid-phase peptide solid - metabolitin-peptide solid phase peptide synthesis Understanding Mersacidin's Structure and Function

vi-peel-peptides The total synthesis of mersacidin, a complex lantibiotic peptide, represents a significant challenge and achievement in organic chemistry.作者：R Dickman·2019·被引用次数：50—28 We have developed a powerfulsolid-phase peptide synthesis(SPPS) strategy for thesynthesisof lanthionine- containingpeptides.29 This is ... Mersacidin is a tetracyclic peptide produced by Bacillus species, known for its potent antimicrobial activity against Gram-positive bacteria, primarily by inhibiting peptidoglycan biosynthesis作者：K Altena·2000·被引用次数：277—Mersacidinis a tetracyclic peptidethat is produced by Bacillus sp. strain HIL Y-85,54728 (9). It belongs to the family of lantibiotics, a group of lanthionine .... Its intricate structure, featuring lanthionine bridges and unusual amino acid residues, necessitates sophisticated synthetic strategies, often employing solid-phase peptide synthesis (SPPS) techniques作者：SM Rowe·2021·被引用次数：38—In typicalsolid-phase peptide synthesis(SPPS) strategies, only one linkage to a solid-support is provided through the C-terminus of the ....

Mersacidin is classified as a type II lanthipeptide, characterized by its post-translational modifications that include the formation of thioether bonds between cysteine residues and dehydroamino acids, creating lanthionine rings. This unique structural feature contributes to its stability and biological activity. The peptide consists of 20 amino acids and exerts its bactericidal effects by interfering with the cell wall biosynthesis pathway, specifically by binding to Lipid II, a crucial precursor molecule. This binding prevents the transglycosylation step, thereby disrupting the formation of the bacterial cell wall.

The Role of Solid-Phase Peptide Synthesis (SPPS)

The total synthesis of complex peptides like mersacidin heavily relies on established methodologies, with solid-phase peptide synthesis (SPPS) being a cornerstone. SPPS offers an efficient approach by anchoring the growing peptide chain to an insoluble solid support, allowing for sequential addition of amino acids and simplified purification through washing steps作者：K Altena·2000·被引用次数：277—Mersacidinis a tetracyclic peptidethat is produced by Bacillus sp. strain HIL Y-85,54728 (9). It belongs to the family of lantibiotics, a group of lanthionine .... This method is particularly advantageous for constructing peptides with intricate modifications, such as the lanthionine rings found in mersacidin.

Researchers have developed various SPPS strategies tailored for lanthionine-containing peptides. These often involve the synthesis of orthogonally protected lanthionine precursors, which can be incorporated into the peptide sequence during solid-phase assembly. Techniques such as Fmoc-based SPPS have been widely adopted for their compatibility with the sensitive nature of modified amino acids and the overall peptide backbone. The ability to precisely control the coupling of each amino acid and the subsequent cyclization steps is critical for achieving the correct three-dimensional structure of mersacidin.

Challenges and Innovations in Mersacidin Synthesis

The total synthesis of mersacidin presents several key challenges. The formation of multiple lanthionine rings requires careful management of reaction conditions to ensure regioselectivity and stereoselectivity. Furthermore, the presence of unusual amino acids and the overall peptide length demand robust coupling chemistries and efficient deprotection strategies.

Innovations in the field have focused on developing more efficient methods for constructing the thioether bridges and incorporating modified amino acids. This includes the synthesis of specialized building blocks and the optimization of cyclization reactionsFundamental functionality: recent developments in .... While natural biosynthesis provides an alternative route to mersacidin, chemical synthesis offers greater control over structural modifications, enabling the creation of analogues with potentially enhanced properties or novel activities. The development of modular approaches, utilizing smaller, well-defined peptide fragments, also contributes to streamlining the synthetic process.作者：JH Viel·2022·被引用次数：8—Mersacidinis an antimicrobial class II lanthipeptide. Lanthipeptides are a class of ribosomally synthesized and post-translationally ...

Future Directions

The continued exploration of mersacidin's total synthesis not only advances our understanding of complex peptide chemistry but also holds promise for the development of new antimicrobial agents. By synthesizing analogues and studying their structure-activity relationships, researchers aim to overcome antibiotic resistance and discover novel therapeutic strategies.(A) Structure of mersacidin (8) and exchanges that were ... The successful total synthesis of mersacidin and similar lantibiotics underscores the power of chemical synthesis in accessing biologically active molecules that are difficult to obtain through other means.