total synthesis mersacidin solid phase peptide total peptide - peptides-benefits-for-women synthesis The Total Synthesis of Mersacidin via Solid-Phase Peptide Synthesis

weightliss-peptide Mersacidin, a potent antimicrobial peptide belonging to the lantibiotic class, has garnered significant research interest due to its efficacy against Gram-positive bacteria.Lanthipeptides: chemical synthesis versus in vivo ... Its unique structure, characterized by the presence of lanthionine (Lan) and methyllanthionine (MeLan) residues, poses a considerable challenge for total synthesis. However, advancements in chemical methodology, particularly solid-phase peptide synthesis (SPPS), have enabled the successful construction of mersacidin and its analogues. This article delves into the intricacies of the total synthesis of mersacidin using solid-phase peptide synthesis, exploring the chemical strategies, key challenges, and the significance of this approach in understanding and developing novel peptide-based therapeuticsUniversity of Alberta.

Mersacidin is a 20-amino acid peptide produced by *Bacillus* species.作者：T Denoël·2014—2.3.4Synthesisfrom dehydroalanine. An orthogonally protected Lan suitable forsolid phase peptide synthesis(SPPS) was synthesized by Probert et al. to ... Its antimicrobial activity stems from its ability to disrupt the bacterial cell wall by targeting Lipid II, a crucial precursor in peptidoglycan biosynthesis.作者：EL Ongey·2016·被引用次数：137—...solid-phase peptidesynthesis;. VRE: vancomycin resistant Enterococci. ...Total synthesisofpeptideantibiotic nisin. Tetrahe- dron Lett ... The presence of thioether bridges, specifically lanthionine and methyllanthionine, formed between cysteine residues and dehydroalanine or dehydrobutyrine, respectively, is a defining feature of lantibiotics like mersacidin. These post-translational modifications are critical for the peptide's structural integrity and biological function.

The total synthesis of mersacidin presents several hurdles.Thetotal synthesisof nisin'^^ has not been optimised for thesolid phase, although there have been reports of the synthesis of smaller lanthionine ... One of the primary challenges lies in the controlled formation of the characteristic lanthionine and methyllanthionine rings. Traditional solution-phase peptide synthesis methods often struggle with the complex cyclization steps and purification of such modified peptides.MS of E17A mersacidin (expected mass, 1767.2 Da) (A) ... This is where solid-phase peptide synthesis (SPPS) emerges as a powerful tool. SPPS, a methodology pioneered by R.AI. The research details thetotal synthesisof the lantibiotic lactocin S, a naturalpeptidefrom Lactobacillus sakei, throughsolid-phase peptidecyclizations ... Bruce Merrifield, allows for the sequential addition of amino acids to a growing peptide chain anchored to an insoluble polymer resin. This approach simplifies purification by enabling the removal of excess reagents and byproducts through simple washing steps, making it highly suitable for the synthesis of complex peptidesVersatile and Stereoselective Syntheses of Orthogonally ....

Several SPPS strategies have been employed for the total synthesis of mersacidin and related lantibiotics. The widely adopted Fmoc (9-fluorenylmethoxycarbonyl) strategy, which utilizes base-labile protecting groups for the N-terminus and acid-labile side-chain protecting groups, is commonly used. The synthesis typically begins by attaching the C-terminal amino acid to a suitable resin.Hybrid Lantibiotics: Combining Synthesis and Biosynthesis Subsequent amino acids, each protected at the N-terminus with Fmoc and at their side chains with acid-labile groups, are coupled sequentiallysynthesis and biological - studies of lanthionine derivatives. The Fmoc group is removed after each coupling step using a mild base, such as piperidine, to expose the N-terminus for the next amino acid addition. This iterative cycle of deprotection and coupling is repeated until the desired linear peptide sequence is assembled on the resin.

A critical aspect of mersacidin synthesis via solid-phase peptide synthesis is the introduction of the non-proteinogenic amino acids and the subsequent cyclization to form the lanthionine and methyllanthionine rings. This can be achieved through various routes. One approach involves the use of pre-formed, orthogonally protected lanthionine and methyllanthionine building blocks that can be directly incorporated into the peptide sequence during SPPS. Alternatively, the linear peptide containing precursor residues like cysteine and dehydroalanine/dehydrobutyrine can be synthesized first, followed by post-synthetic cyclization reactions, either on the solid support or after cleavage from the resin. The formation of these thioether bridges typically involves the Michael addition of a thiol group to an activated dehydroamino acid. Careful control of reaction conditions, including pH and reagent concentrations, is crucial to ensure regioselective and stereoselective cyclization.

The total synthesis of mersacidin using solid-phase peptide synthesis not only provides access to the natural product but also allows for the creation of analogues with modified structures作者：NA Santos-Filho·2015·被引用次数：57—Solid phase peptide synthesis(SPPS) was performed manually by the ... The spectra in far ultraviolet light (UV, 195–250 nm) showed that all .... These malacidin analogues, for instance, can be synthesized by incorporating different amino acids or altering the position and number of lanthionine rings. Such modifications are invaluable for structure-activity relationship (SAR) studies, helping researchers to understand which structural features are essential for antimicrobial activity and to design improved therapeutic agents. The ability to perform full synthesis of complex peptides with defined sequences and modifications is a testament to the power of modern organic chemistry and peptide synthesis.

In conclusion, the total synthesis of mersacidin through solid-phase peptide synthesis represents a significant achievement in the field of peptide chemistry. This approach overcomes the inherent difficulties associated with the complex structure of lantibiotics, enabling the production of both the natural peptide and its derivatives. The methodologies developed for mersacidin synthesis have broader implications for the synthesis of other challenging peptides and offer promising avenues for the discovery and development of novel antibiotics in an era of increasing antimicrobial resistance. The ongoing research in total peptide synthesis continues to push the boundaries of what is achievable in creating complex biomolecules for therapeutic and scientific exploration.