solid-phase peptide synthesis of duramycin duramycin - solid-phase-peptide-synthesis-subtilin duramycin's Solid-Phase Peptide Synthesis of Duramycin: A Comprehensive Approach

coles-collagen-peptides Duramycin, a potent lantibiotic antimicrobial peptide derived from *Streptomyces cinnamonea*, has garnered significant attention for its diverse biological activities, including antimicrobial and potential antiviral applications.Bacteriocins as natural weapon against cancer: in vitro, in vivo ... The complexity of its structure, characterized by post-translational modifications such as dehydration and cyclization, presents a unique challenge for chemical synthesis. Among the various methods available for peptide production, solid-phase peptide synthesis (SPPS) has emerged as a cornerstone technology, offering efficiency and versatility. This article delves into the intricacies of solid-phase peptide synthesis of duramycin, exploring the underlying principles, advancements, and its significance in unlocking the therapeutic potential of this remarkable peptide.Solid Phase Peptide Synthesis and Its Applications in ...

Understanding Solid-Phase Peptide Synthesis (SPPS)

At its core, SPPS is a chemical method for assembling peptides by stepwise addition of protected amino acids to a growing peptide chain anchored to an insoluble solid support, typically a resin. This approach, first pioneered by R. Bruce Merrifield, revolutionized peptide synthesis by simplifying purification and enabling automation. The general workflow involves:

1. Resin Loading: The C-terminal amino acid of the target peptide is covalently attached to the resin.Solid Phase Peptide Synthesis(SPPS) is a powerful tool for the design and synthesis of peptides with potential antimicrobial activity. In recent years, SPPS ...

2.Lanthipeptides: chemical synthesis versus in vivo biosynthesis ... Deprotection: The temporary protecting group on the N-terminus of the resin-bound amino acid is removed.

3. Coupling: The next protected amino acid in the sequence is activated and coupled to the free N-terminus.

4. Repetition: Steps 2 and 3 are repeated iteratively until the entire peptide sequence is assembled作者：A Boto·2021·被引用次数：76—The sulfamidates were incorporated intopeptidesfor solution andsolid-phase synthesis, in both cases affording S-linked glycopeptides in good yield and ....

5. Cleavage and Deprotection: The completed peptide is cleaved from the resin, and any permanent side-chain protecting groups are removed.

The solid support offers several advantages, including easy removal of excess reagents and by-products through simple filtration and washing stepsSolid-Phase Peptide Synthesis. This minimizes the need for rigorous intermediate purifications often encountered in solution-phase synthesis作者：SK Tiwari·2020·被引用次数：124—...phase(Maretschek et al., 2008). Bi et al. (2011) extended the ... Thepeptide duramycinhas been shown to have a rather specific antiviral .... Furthermore, the ability to utilize an excess of reagents drives the reaction to completion, maximizing yields.

The Significance of SPPS for Duramycin Synthesis

The unique structural features of duramycin, including its polycyclic lanthionine bridges and modified amino acids, demand precise control over each synthetic step.Solid-Phase Peptide Synthesis Solid-phase peptide synthesis provides this precision. While biosynthesis offers an alternative route for duramycin production, chemical synthesis via SPPS allows for the generation of specific analogues and the introduction of point mutations to explore structure-activity relationships. This is particularly important for understanding the mechanism of action of duramycin against various pathogens and for developing drug candidates with improved efficacy and pharmacokinetic profiles.

Key Considerations in the Solid-Phase Peptide Synthesis of Duramycin

Several critical factors influence the successful solid-phase synthesis of complex peptides like duramycin:

* Resin Choice: The selection of the appropriate solid support is crucialPhosphatidylethanolamine Binding Is a Conserved Feature .... Resins such as Wang resin or Rink amide resin are commonly employed, chosen based on the desired C-terminus of the peptide (acidic or amidated) and the cleavage conditions required.

* Protecting Groups: Orthogonal protecting group strategies are essential. The Fmoc (9-fluorenylmethoxycarbonyl) strategy is widely adopted for SPPS due to its mild deprotection conditions (using piperidine), which is compatible with many amino acid side-chain protecting groups. Careful selection of side-chain protecting groups is vital to prevent unwanted reactions during synthesis.

* Coupling Reagents: Efficient activation of the incoming amino acid is paramount for achieving high coupling efficienciesExploring the antibiotic potential of cultured 'unculturable .... Common coupling reagents include HBTU, HATU, and DIC/HOBt作者：Y Fu·2023·被引用次数：15—We report a class I lanthipeptide biosynthetic gene cluster (lanBTC) in a Bacillus strain, involved in the biosynthesis of a novel lanthipeptide that we termed .... For challenging couplings, such as those involving sterically hindered amino acids or during the formation of the lanthionine rings, specialized reagents or prolonged reaction times may be necessary.

* Lanthionine Ring Formation: The characteristic thioether cross-links in duramycin, the lanthionine rings, are formed through intramolecular cyclization reactionsSolid phase peptide synthesis processes and associated .... In SPPS, these modifications are typically introduced after the main peptide backbone is assembled or are pre-formed and then incorporated.作者：SK Tiwari·2020·被引用次数：124—...phase(Maretschek et al., 2008). Bi et al. (2011) extended the ... Thepeptide duramycinhas been shown to have a rather specific antiviral ... Solid-phase synthesis allows for controlled conditions to facilitate these cyclization events, although challenges like regioselectivity and yield optimization persist.

* Cleavage and Purification: Once the peptide is synthesized, it is cleaved from the resin using strong acids, such as trifluoroacetic acid (TFA), which also removes side-chain protecting groups. The crude peptide then undergoes purification, typically by reversed-phase high-performance liquid chromatography (RP-HPLC), to isolate the target compound with high purity. Spectroscopic techniques like Mass Spectrometry (MS) and Nuclear Magnetic Resonance (NMR) are then employed for characterization and confirmation of the structureUnited States Patent (19) - Googleapis.com.

Advancements in SPPS for Duramycin

Recent advancements in solid-phase synthesis have further enhanced its utility for producing complex peptides like duramycin. Microwave-assisted SPPS, for instance, significantly accelerates coupling and deprotection steps by efficiently transferring energy to the reaction mixture, leading to reduced synthesis times and potentially higher yields. High-efficiency SPPS (HE-SPPS) strategies also aim to improve coupling efficiencies, especially for challenging sequences. Automation through automated peptide synthesizers streamlines entire processes, increasing throughput and reproducibility for both research and industrial peptide production.Understanding the Mechanism of Action of NAI-112, a ...

Duramycin's Therapeutic Potential and Future Directions

The successful solid-phase synthesis of duramycin and its analogues is critical for advancing its therapeutic applications. Research has demonstrated duramycin's ability to bind to anionic phospholipids and aminophospholipids, a property being explored for treating viral infectionsLanthipeptides: chemical synthesis versus in vivo biosynthesis .... Furthermore, duramycin's effectiveness as an antimicrobial peptide has led to investigations into its potential against antibiotic-resistant bacteria and even as an anti-cancer agent.2023年6月5日—SPPS is a method used to createpeptidesby assembling amino acids in a stepwise fashion on asolidsupport, such as a resin. The journey from discovery to clinical application, including potential Phase II trials as suggested by some research, relies heavily on the ability to produce sufficient quantities of high-purity duramycin and its derivatives. Solid phase peptide synthesis remains a vital tool in this endeavor, enabling the exploration and development of this promising peptide with diverse biological activitiesGuide to Solid Phase Peptide Synthesis - AAPPTEC. Understanding duramycin's biosynthesis, including the genes involved, also provides valuable insights that can complement synthetic efforts. The pursuit of more efficient and scalable solid-phase peptide synthesis methods will undoubtedly accelerate the realization of duramycin's full therapeutic promise.