total-synthesis-of-duramycin-solid-phase-peptide-synthesis The total synthesis of mersacidin using solid phase peptide synthesis (SPPS) represents a significant achievement in medicinal chemistry, enabling the production of this potent antimicrobial peptide for further study and potential therapeutic applications. Mersacidin, a 20-amino acid lantibiotic produced by *Bacillus* species, exhibits broad-spectrum activity against Gram-positive bacteria by disrupting cell wall synthesis. While naturally occurring, its isolation can be challenging, making chemical synthesis a crucial alternative for obtaining sufficient quantities for research and development. The application of solid-supported total synthesis methodologies has been instrumental in overcoming the complexities associated with constructing such intricate peptide structures.
Mersacidin is classified as a lantibiotic, a group of ribosomally synthesized and post-translationally modified peptides characterized by the presence of lanthionine (Lan) and methyllanthionine (MeLan) cross-links. These unique thioether bridges are critical for the peptide's three-dimensional structure and its potent antimicrobial activity. The specific sequence and intricate folding of mersacidin allow it to bind to lipid II, a key precursor in bacterial cell wall biosynthesis, thereby inhibiting its polymerization and leading to cell death. Its efficacy against drug-resistant pathogens like methicillin-resistant *Staphylococcus aureus* (MRSA) underscores its therapeutic potential.Marine Antimicrobial Peptides-Based Strategies for ...
Solid phase peptide synthesis (SPPS) has revolutionized peptide chemistry by immobilizing the growing peptide chain to a solid support, typically a resin beadThesynthesisof bioactive cyclic proline-rich heptapeptide through two-stepsolid-phase/solutionsynthesisoffers a promising strategy for the bulksynthesis.... This approach simplifies the synthesis process by allowing excess reagents and byproducts to be washed away after each coupling step, significantly reducing purification challenges compared to traditional solution-phase methods.作者：SM Rowe·2021·被引用次数：37—In typicalsolid-phase peptide synthesis(SPPS) strategies, only one linkage to a solid-support is provided through the C-terminus of the ... For the total synthesis of complex peptides like mersacidin, SPPS offers a robust and efficient platform.
The general SPPS strategy involves sequentially adding protected amino acids to the N-terminus of the growing peptide chain attached to the solid support作者：PJ Knerr·2012·被引用次数：93—We envisioned thesolid-supported total synthesisto utilize orthogonally protected Lan/MeLan building blocks, (10, 11, 20-22) which allow .... Key steps include:
* Resin Loading: The first amino acid is attached to the solid support.
* Deprotection: The temporary protecting group on the N-terminus of the resin-bound amino acid or peptide is removedThetotal synthesisof nisin'^^ has not been optimised for thesolid phase, although there have been reports of thesynthesisof smaller lanthionine ....
* Coupling: The next protected amino acid is activated and coupled to the free N-terminus.
* Washing: Excess reagents and byproducts are removed by washing the resin.Congeneric Lantibiotics from Ribosomal In Vivo Peptide ...
These steps are repeated until the full peptide sequence is assembled. For mersacidin, the synthesis is further complicated by the presence of non-proteinogenic amino acids and the need to form the characteristic lanthionine cross-links.Functional Analysis of the Lipoglycodepsipeptide Antibiotic ... This often requires specialized orthogonally protected building blocks and specific cyclization strategies, which can be effectively managed within the SPPS framework. The total solid phase approach streamlines the introduction of these modified amino acids and subsequent cyclizations.Orthogonally Protected Lanthionines: Synthesis and Use ...
The synthesis of mersacidin presents several challenges due to its complex structure:
* Modified Amino Acids: The presence of lanthionine and methyllanthionine requires the synthesis and incorporation of these unusual amino acids.作者：PJ Knerr·2012·被引用次数：93—We envisioned thesolid-supported total synthesisto utilize orthogonally protected Lan/MeLan building blocks, (10, 11, 20-22) which allow ... This necessitates the development of specialized protecting group strategies to ensure selective coupling and cyclization.The Lantibiotic Mersacidin Is an Autoinducing Peptide - PMC
* Cyclization: The formation of the thioether bridges that define the lantibiotic structure requires precise control over reaction conditions and the use of appropriate reagents to achieve regioselective cyclization.
* Orthogonal Protection: To facilitate the formation of multiple cross-links and prevent unwanted side reactions, amino acid side chains and the peptide backbone often require orthogonal protecting groups that can be removed independently under different conditions.Marine Antimicrobial Peptides-Based Strategies for ...
Researchers have developed innovative approaches to address these challenges.2012年2月1日—TL;DR:Solid-supported chemicalsynthesisenabled thetotal synthesisof the lantibiotic lacticin 481 and analogues containing cross-links with ... The use of orthogonally protected lanthionine building blocks has been crucial for successful SPPS of mersacidin and its analogues.Green Solid-Phase Peptide Synthesis 2. 2-Methyltetrahydrofuran and ... These specialized monomers allow for controlled incorporation and subsequent cyclization, enabling the construction of the complex disulfide-like bridges characteristic of lantibiotics. Furthermore, advancements in coupling reagents and solid supports have improved the efficiency and yield of peptide bond formation, even with sterically hindered amino acids often found in modified peptidesLarge-Scale Synthesis of Peptides.
The ability to synthesize mersacidin via SPPS opens up numerous avenues for research and development. Synthetically produced mersacidin can be used to:
* Investigate Structure-Activity Relationships: By synthesizing analogues with specific modifications, researchers can elucidate the structural determinants of mersacidin's antimicrobial activity and target specificity. This insight is crucial for designing next-generation antibiotics with improved efficacy and reduced resistance potential.
* Develop New Antibacterial Agents: Mersacidin's potent activity against Gram-positive bacteria, including resistant strains, makes it a promising lead compound for developing novel therapeutics. Chemical synthesis allows for the production of sufficient quantities for preclinical and clinical trials.Orthogonally Protected Lanthionines: Synthesis and Use ...
* Study Mechanistic Details: Synthetically accessible mersacidin enables detailed studies into its mechanism of action at a molecular level, including its interaction with lipid II and its effects on bacterial cell membranes.Synthesis Notes
The ongoing research in the total synthesis of mersacidin and other lantibiotics highlights the power of modern peptide chemistry. As synthetic methodologies continue to advance, particularly in areas like green solid-phase peptide synthesis, the production of complex antimicrobial peptides will become more efficient and sustainable, paving the way for new strategies to combat the growing threat of bacterial infections.Complexation of peptidoglycan intermediates by the ... The peptide mersacidin, once a molecule solely produced by bacteria, is increasingly becoming a product of sophisticated chemical synthesis.
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