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Solid-Phase Peptide Synthesis for Nisin and Lantibiotic Total Synthesis

The solid-phase peptide synthesis (SPPS) of the lantibiotic nisin and its analogues represents a significant advancement in the chemical synthesis of complex peptides.1984 Nobel Prize in Chemistry - The Rockefeller University Nisin, a potent lantibiotic produced by *Lactococcus lactis*, is a class I lantibiotic characterized by its unique thioether-containing modified amino acids, such as lanthionine and methyllanthionine, as well as dehydroamino acids. The total synthesis of such molecules presents considerable challenges due to their intricate post-translational modifications and cyclic structures. SPPS offers a robust methodology to overcome these hurdles, enabling the preparation of nisin and related lantibiotics for research into their biological activities, mechanisms of action, and potential therapeutic applications.

Advancements in Nisin and Lantibiotic Synthesis

The development of SPPS methodologies has been crucial for accessing nisin and its analogues. Researchers have successfully employed SPPS to synthesize key structural fragments of nisin, including the A-ring, which contains crucial modifications like dehydroalanine (Dha). By incorporating modified amino acids and employing specific coupling strategies on solid supports, chemists can construct the peptide backbone while meticulously controlling the introduction of these unique residuesComplete synthesis of the bicyclic ring of a mutacin analog .... This approach has facilitated the synthesis of analogues where specific residues, such as Dha at position 5, are replaced, allowing for detailed structure-activity relationship studies.

Furthermore, SPPS has been instrumental in synthesizing individual ring structures from nisin and related lantibiotics like mutacin. This includes the preparation of ring A and ring B structures, providing researchers with tools to investigate the molecular recognition of lipid II, the primary target of lantibiotics. The ability to synthesize these specific substructures allows for a deeper understanding of how lantibiotics bind to their targets and exert their antimicrobial effects.

Challenges and Innovations in Total Synthesis

The total synthesis of lantibiotics like nisin is a complex undertaking. Beyond the linear peptide assembly, these molecules often feature complex thioether bridges that form rings, contributing to their structural rigidity and biological potency. SPPS provides a platform for the stepwise assembly of the peptide chain on a solid resin, followed by cyclization and cleavage from the resin.1984 Nobel Prize in Chemistry - The Rockefeller University

Recent innovations in SPPS have focused on developing efficient methods for incorporating non-proteinogenic amino acids and forming the characteristic thioether linkagesMolecular Recognition of Lipid II by Lantibiotics: Synthesis .... This includes the use of orthogonally protected lanthionines, which are essential building blocks for constructing the modified amino acid residues found in lantibiotics. The complete chemical synthesis of complex ring structures, such as the bicyclic C/D ring of MU1140 analogs, has been reported using these advanced SPPS techniques2025年8月6日—Solid-phase peptide synthesisof analogues of the N -terminus A-ring fragment of thelantibiotic nisin: Replacements for the dehydroalanine (Dha) ....

The synthesis of lantibiotics like lactocin S, another natural peptide antibiotic, has also been achieved through solid-phase peptide cyclizations. This demonstrates the versatility of SPPS in tackling the synthesis of various lantibiotic classes, paving the way for the exploration of their diverse biological activities as antibiotic nisin and other peptides derived from bacteria.

Applications and Future Directions

The successful synthesis of nisin and other lantibiotics via SPPS opens up avenues for numerous applications. These peptides are known for their potent antimicrobial activity against a broad spectrum of Gram-positive bacteria, making them attractive candidates for novel antibiotics in the face of rising antimicrobial resistance. Understanding their mechanism of action, particularly their interaction with lipid II, is crucial for developing new antimicrobial strategies.

Moreover, the synthetic accessibility of nisin analogues allows for the fine-tuning of their properties, such as stability, specificity, and spectrum of activity. This can lead to the development of improved antimicrobial agents or tools for studying bacterial physiology.synthesis and stereochemical analysis of β-benzotriazole N-oxide ... The ongoing research in solid phase peptide synthesis for lantibiotics promises to yield valuable insights into peptide chemistry, drug discovery, and our understanding of natural antimicrobial compounds.