solid-phase-peptide-synthesis-total-synthesis-lantibiotic The solid-phase peptide synthesis of epidermin analogues represents a crucial area of research for developing novel antimicrobial agentsMultipronged approach for engineering novel peptide .... Epidermin, a potent lantibiotic, has inspired the creation of modified versions through synthetic approaches to enhance its therapeutic potential, improve stability, or alter its spectrum of activity. Solid-phase peptide synthesis (SPPS) is the cornerstone methodology enabling the efficient and controlled assembly of these complex peptide structures on a solid support, facilitating the systematic exploration of epidermin's structure-activity relationships.peptide compound, cosmetic or dermopharmaceutical ...
Epidermin is a naturally occurring antimicrobial peptide belonging to the lantibiotic class. These peptides are characterized by their unique post-translational modifications, including the formation of thioether rings (lanthionine and methyllanthionine) and the presence of dehydroamino acids. These structural features contribute to epidermin's potent bactericidal activity, primarily against Gram-positive bacteria.From precision synthesis to cross-industry applications However, natural peptides often face limitations such as susceptibility to enzymatic degradation, potential toxicity, or a narrow spectrum of action, which can hinder their clinical application.
The synthesis of epidermin analogues aims to overcome these limitations. By modifying the amino acid sequence, altering the cyclization patterns, or introducing non-natural amino acids, researchers can create peptides with improved pharmacological properties. For instance, analogues might be designed for enhanced stability against proteases, reduced host cell toxicity, or a broader range of antimicrobial activity.One example of this is thesynthesisof the daptomycinanalog, triazolyl-daptomycin, which was accomplished using SPPS and click chemistry. In this approach, ... The development of these synthetic analogues is vital for unlocking the full therapeutic promise of the epidermin scaffold.Solid Phase Peptide Synthesis (SPPS) explained
Solid-phase peptide synthesis (SPPS) has revolutionized peptide chemistry by allowing for the sequential addition of amino acids to a growing peptide chain anchored to an insoluble solid support, typically a resin. This method offers several significant advantages over traditional solution-phase synthesis:
* Simplified Purification: Excess reagents and by-products can be easily washed away from the solid support after each coupling step, eliminating the need for intermediate purification.
* Automation Potential: The repetitive nature of SPPS lends itself well to automation, enabling the synthesis of longer and more complex peptides with greater efficiency.
* High Yields: The use of excess reagents drives reactions to completion, leading to high yields of the desired peptide.作者：M Wang·2025·被引用次数：4—... peptides [2]. Chemical synthesis, especiallysolid-phase peptide synthesis(SPPS), has completely changed the production method of peptide by achieving ...
* Versatility: SPPS can accommodate a wide range of amino acid derivatives and coupling strategies, making it suitable for synthesizing diverse peptide structures, including those with complex modifications like those found in epidermin.
The most common SPPS strategies employed for synthesizing peptide analogues include Fmoc (9-fluorenylmethyloxycarbonyl) and Boc (tert-butyloxycarbonyl) chemistries. Fmoc chemistry is generally favored for its milder deprotection conditions, which are compatible with a wider array of acid-labile side-chain protecting groups and are better suited for synthesizing longer and more complex peptides, including those with intricate cyclizations.
The synthesis of epidermin analogues using SPPS involves a series of carefully orchestrated steps:
1.Solid Phase Peptide Synthesis (SPPS) explained Resin Selection and Loading: The process begins with selecting an appropriate resin, which will serve as the solid support. The choice of resin depends on the desired C-terminus of the peptide (e.g., a free acid or an amide). The first amino acid is then covalently attached to the resin.
2. Deprotection: The N-terminal protecting group of the immobilized amino acid is removed to expose the free amine for the next coupling reaction. In Fmoc-based SPPS, this is typically achieved using a piperidine solution.An introductory guide tosolid phase peptide synthesis. Resins, amino acid derivatives, coupling reagents, common problems and their solutions, peptide ...
3. Amino Acid Coupling: The next protected amino acid is activated and coupled to the free amine on the resin-bound peptide.作者：R Bellavita·2021·被引用次数：36—Synthesis. Linear precursors of peptides 10–26 were synthesized following the Fmoc-based ultrasonic-assistedsolid-phase peptide synthesis(US– ... Various coupling reagents (e.Solid-phase peptide synthesisg., HBTU, HATU, DIC/HOBt) are used to form the peptide bond efficiently.作者：PJ Knerr·2012·被引用次数：92—In this study,solid-supported chemicalsynthesiswas used to produceanaloguesof the potent lantibiotic epilancin 15X.
4. Washing: After each deprotection and coupling step, the resin is thoroughly washed with appropriate solvents to remove unreacted reagents and by-products作者：S Mitchell·2018—Reversephasehigh performance liquid chromatography (HPLC) was used for purification of allpeptides. 3.3 Ring BAnalogue(138). Before attemptingsynthesisof ....
5. Repetition: Steps 2-4 are repeated sequentially, adding one amino acid at a time, until the desired peptide sequence is assembled.Solid-Phase Peptide Synthesis of Analogues of the N- ...
6. Side Chain Deprotection and Cleavage: Once the full linear peptide sequence is synthesized, the side-chain protecting groups are removed, and the peptide is cleaved from the solid support using a strong acid cocktail (e.g., TFA-based).
7. Cyclization: For epidermin analogues, which are cyclic peptides, a crucial post-cleavage or on-resin cyclization step is required to form the characteristic thioether rings and/or other cyclic structures.Guide to Solid Phase Peptide Synthesis - AAPPTEC This often involves specific reagents and conditions to promote disulfide bond formation or the formation of lanthionine bridges.
8. Purification and Characterization: The crude peptide is then purified, typically using reverse-phase high-performance liquid chromatography (RP-HPLC). The identity and purity of the synthesized analogue are confirmed using mass spectrometry (MS) and NMR spectroscopy.
While SPPS offers a powerful platform for epidermin analogue synthesis, several challenges need to be addressed:
* Complex Modifications: Epidermin's structure includes non-standard amino acids and thioether bridges, which require specialized reagents and careful synthetic planning.作者：LH Kondejewski·2002·被引用次数：97—Peptide Synthesisand Purification—All peptides were synthesized bysolid phase peptide synthesisusing t-butyloxycarbonyl chemistry, cleaved from the resin ... The formation of these thioether rings, particularly during on-resin cyclization, can be challenging and may require optimized conditions to achieve high yields and regioselectivity作者：V Mäde·2014·被引用次数：350—Thesynthesisand application of SPPS is described for neuropeptide Y receptoranalogsas an example for bioactive hormones. The applied strategies represent ....
* Aggregation: As the peptide chain grows on the resin, aggregation can occur, hindering reagent access and reducing coupling efficiency作者：S Mitchell·2018—Reversephasehigh performance liquid chromatography (HPLC) was used for purification of allpeptides. 3.3 Ring BAnalogue(138). Before attemptingsynthesisof .... This is particularly problematic for hydrophobic sequences.
* Racemization: During the activation and coupling of amino acids, there is a risk of racemization, leading to the formation of undesired stereoisomers.The solid phase supported peptide synthesis of analogues ... Careful selection of coupling reagents and conditions can minimize this.One example of this is thesynthesisof the daptomycinanalog, triazolyl-daptomycin, which was accomplished using SPPS and click chemistry. In this approach, ...
* Incomplete Reactions: Incomplete coupling or deprotection steps can lead to deletion sequences or modified peptides, requiring rigorous purification.
* Scale-Up: Scaling up SPPS for large-scale production can present engineering and cost challenges.
The ability to synthesize epidermin analogues via SPPS opens doors to numerous applications. These synthetic peptides can serve as:
* Novel Antibiotics: Analogues with enhanced potency, broader spectrum, or improved pharmacokinetic profiles could lead to new treatments for bacterial infections, particularly those caused by antibiotic-resistant strains.
* Research Tools: Modified epidermins can help elucidate the mechanisms of action of lantibiotics and their interactions with bacterial targets, such as Lipid II.
* Diagnostic Agents: Specific analogues might be developed for diagnostic purposesOne example of this is thesynthesisof the daptomycinanalog, triazolyl-daptomycin, which was accomplished using SPPS and click chemistry. In this approach, ....
Continued advancements in SPPS methodologies, including the development of new resins, coupling reagents, and cyclization strategies, will further facilitate the synthesis of increasingly complex and diverse epidermin analogues. The integration of automated synthesis platforms and innovative purification techniques will also play a vital role in accelerating the discovery and development of these promising antimicrobial peptides. The solid phase peptide synthesis of these sophisticated molecules remains a dynamic and essential field in medicinal chemistry and drug discovery.
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