total synthesis nisin solid phase peptide synthesis Solid Phase Peptide Synthesis - peptides-benefits-health total synthesis Advancing Antimicrobial Research: The Total Synthesis of Nisin via Solid-Phase Peptide Synthesis

peptides-before-or-after-vitamin-c The quest for novel antimicrobial agents remains a critical area of scientific endeavor, particularly in the face of rising antibiotic resistance. Nisin, a naturally occurring lantibiotic produced by *Lactococcus lactis*, has long been recognized for its potent antibacterial activity.作者：B Mothia·2011·被引用次数：50—A methodology for thesolid-phase synthesisof the overlapping lanthionine bridges found in many lantibiotics has been developed. Its complex structure, featuring modified amino acids and thioether rings, presents a significant challenge and opportunity for total synthesis. This article delves into the intricate world of nisin total synthesis, with a particular focus on the application and advancements in solid-phase peptide synthesis (SPPS), a cornerstone technique in modern peptide chemistry.Semi-synthesis of nisin-based peptide antibiotics

Nisin's Significance and Structural Complexity

Nisin is a well-established food preservative, valued for its ability to inhibit the growth of a wide range of Gram-positive bacteria, including problematic pathogens like *Listeria monocytogenes*. Its mechanism of action involves binding to the lipid II precursor of bacterial cell wall synthesis, disrupting membrane integrity and leading to cell death. The unique structural features of nisin, such as the presence of lanthionine bridges and dehydroamino acids (like Dha), contribute significantly to its biological activity and therapeutic potential. However, these modifications also make its chemical synthesis a formidable task.

Solid-Phase Peptide Synthesis (SPPS): A Revolution in Peptide Production

The development of solid-phase peptide synthesis (SPPS) by R.This document provides detailed protocols for the chemicalsynthesisof sakacin P and its analogs using Fmoc-basedsolid-phase peptide synthesis(SPPS). The ... Bruce Merrifield revolutionized the field of peptide chemistry. This methodology involves the stepwise assembly of amino acids on an insoluble resin support. The key advantage of SPPS lies in its simplified purification process. After each coupling step, excess reagents and byproducts are simply washed away with solvents, eliminating the need for tedious intermediate purifications common in solution-phase peptide synthesis. This efficiency has made SPPS indispensable for the synthesis of peptides, ranging from short dipeptides to complex polypeptides with up to 100 amino acids.2023年1月31日—Solutionphase peptide synthesisis typically very arduous and laborious - requiring long coupling reaction times and a need for recrystallization or column ...

Applying SPPS to Nisin Synthesis: Challenges and Innovations

The total synthesis of nisin using solid-phase peptide synthesis leverages the power of this technique to construct the intricate peptide backbone. The process typically involves:

* Resin Attachment: The C-terminal amino acid of nisin is covalently linked to a suitable resin, such as Wang resin or MBHA resin, via a linker.

* Deprotection: The N-terminal protecting group of the attached amino acid is removed, exposing a free amine for the next coupling step.2022年5月13日—Assolid-phase synthesissimplifies the tedious and time-consuming isolation of intermediates, it has been widely applied inpeptide synthesis.

* Coupling: The next protected amino acid is activated and coupled to the free amine of the growing peptide chain. This cycle of deprotection and coupling is repeated for each amino acid in the nisin sequence.

* Side Chain Protection: Crucially, the reactive side chains of certain amino acids must be protected with temporary protecting groups to prevent undesired side reactions during the synthesis. The conventional SPPS often requires protecting these nucleophilic side chains.作者：JC Slootweg·2013—Furthermore, through solution andsolid phase peptide synthesis, mimics ofnisinfragments were successfully prepared replacing the lanthionines ...

* Cleavage and Deprotection: Once the full peptide sequence is assembled on the resin, the peptide is cleaved from the support, and all side chain protecting groups are removed simultaneously.

Researchers have explored various strategies to overcome the specific challenges associated with nisin synthesis, including the efficient formation of the lanthionine bridges and the stereoselective introduction of modified amino acids. For instance, solid-phase synthesis methodologies have been developed for analogues of the A-ring of nisin, incorporating replacements for the Dha at position 5. Furthermore, innovative approaches like ring-opening reactions for the solid-phase synthesis of nisin lipopeptide analogues have been investigatedWhat is solid phase peptide synthesis?.

Advancements and Future Directions

The field continues to evolve with advancements aimed at improving the efficiency and sustainability of SPPS. Recent research has focused on developing processes that totally eliminate all solvent-intensive washing steps during each amino acid addition, significantly reducing solvent waste and processing time. The exploration of green chemistry principles in minimal-protection solid-phase peptide synthesis also highlights a growing awareness of environmental impact.

The ability to perform total synthesis of nisin and its analogues opens up new avenues for research and development. This includes:

* Structure-Activity Relationship Studies: Synthesizing various fragments and modified versions of nisin allows researchers to precisely dissect its antibacterial activity and identify key structural determinants.作者：L Guo·2023·被引用次数：31—...peptideusing chemicalsynthesis(12. 12. Koopmans, T. ∙ Wood, T.M. ... Figure 7 shows that allfull-lengthnisinmutants and truncatednisin... This is crucial for understanding how amino acid substitutions influence biosynthesis and overall peptide efficacy.

* Development of Novel Antimicrobials: By understanding the structure-activity relationships, scientists can design and synthesize novel nisin-based peptide antibiotics with enhanced potency, broader spectrum activity, or improved pharmacokinetic properties.Jetting manufacturing of resins for solid-phase peptide ... This includes exploring lipidated variants of the antimicrobial peptide nisinSemi-synthesis of nisin-based peptide antibiotics.

* Therapeutic Applications: Beyond its established role as a food preservative, nisin and its synthetic derivatives hold promise for therapeutic applications, potentially as treatments for infections caused by resistant bacteria. Research into Nisin's influence on bacterial cell wall synthesis provides a foundation for developing targeted therapies.

In conclusion, the total synthesis of nisin via solid-phase peptide synthesis represents a significant achievement in organic chemistry and a vital step towards harnessing the full potential of this remarkable lantibiotic. Continued innovation in SPPS methodologies and a deeper understanding of nisin's structure and function will undoubtedly pave the way for new discoveries and the development of next-generation antimicrobial strategies. The journey from basic peptide synthesis to the complex full-length nisin or its truncated forms showcases the power of chemical synthesis in advancing human health.2022年5月13日—Assolid-phase synthesissimplifies the tedious and time-consuming isolation of intermediates, it has been widely applied inpeptide synthesis.