solid-phase-peptide-synthesis-nukacin The solid-phase peptide synthesis of subtilin total synthesis is a complex endeavor that merges established chemical methodologies with the unique properties of subtilin. Subtilin, a lantibiotic produced by *Bacillus subtilis*, is a fascinating antimicrobial peptide with a complex post-translational modification pattern, including thioether bridges and unusual amino acids, which presents significant challenges for its de novo synthesis. Solid-phase peptide synthesis (SPPS) offers a robust framework for assembling the linear peptide chain, providing a critical foundation for achieving the total synthesis of such intricate molecules作者：H Murata·2018·被引用次数：52—Fullaccess to abiotic/biotic synthetic diversity first occurred when chemistry was developed to grow nucleic acids andpeptidesfrom reversibly ....
Solid-phase peptide synthesis, a cornerstone technique in peptide chemistry, involves the stepwise addition of amino acids to a growing peptide chain anchored to an insoluble solid support, typically a resin. This method streamlines the synthesis process by allowing excess reagents and byproducts to be easily washed away after each coupling step, significantly simplifying purification compared to solution-phase methods. The process generally involves:
* Resin Loading: The first amino acid is covalently attached to the resin.
* Deprotection: A temporary protecting group on the N-terminus of the attached amino acid is removed.
* Coupling: The next protected amino acid is activated and coupled to the free N-terminus.
* Repetition: The deprotection and coupling steps are repeated until the desired peptide sequence is assembled.cessfully applied in thesolid phase, resulting in the firsttotal synthesisof the en- ... peptides and proteins bypeptide synthesisor total chemical synthesis.
* Cleavage: The completed peptide is cleaved from the resin, and any permanent side-chain protecting groups are removedSolid-phase synthesis of protein-polymers on reversible ....
Subtilin's structural complexity is a primary hurdle in its total synthesis. Unlike simple linear peptides, subtilin features multiple thioether cross-links formed between cysteine residues and dehydroalanine or dehydrobutyrine residues. These modifications are crucial for its biological activity and three-dimensional structure.作者：GE Reid·1992·被引用次数：70—Standard Applied Biosystems Model 430A cycles were employed for single PSA couplings for all amino acid additions except for glutamine, asparagine, and ar-. Achieving the correct formation of these thioether bridges, often through oxidative cyclization reactions, requires precise control and sophisticated chemical strategies. The presence of unusual amino acids, such as $\beta$-methyllanthionine and dehydroamino acids, further complicates the synthesis by requiring specialized building blocks and coupling conditions.
The total synthesis of subtilin necessitates adapting standard SPPS protocols to accommodate its specific structural features.作者：H Murata·2018·被引用次数：52—Fullaccess to abiotic/biotic synthetic diversity first occurred when chemistry was developed to grow nucleic acids andpeptidesfrom reversibly ... This involves:
* Specialized Amino Acid Derivatives: Incorporating protected forms of the unusual amino acids and cysteine residues that can later participate in thioether bond formation.
* Optimized Coupling Conditions: Ensuring efficient coupling of sterically hindered amino acids or those with complex side chains, which can be challenging in SPPS.
* Strategic Placement of Thioether Precursors: Designing the linear peptide sequence so that the precursor residues for thioether bridge formation are correctly positioned for subsequent cyclization.Total Synthesis of Enlicitide Decanoate - ACS Publications This might involve synthesizing a linear precursor peptide and then performing post-synthetic modifications.
* Cleavage and Cyclization Strategies: Developing robust methods for cleaving the peptide from the resin and subsequently inducing the formation of the thioether cross-links. This often involves oxidative conditions that must be carefully controlled to avoid unwanted side reactions or peptide degradation.
The total chemical synthesis of subtilin is a significant undertaking, as evidenced by the limited number of successful total syntheses reported in the literature.Base Resins for Peptide Synthesis Challenges include:
* Yields: Multi-step syntheses, especially those involving complex modifications, can suffer from cumulative yield losses.作者：H Murata·2018·被引用次数：52—Fullaccess to abiotic/biotic synthetic diversity first occurred when chemistry was developed to grow nucleic acids andpeptidesfrom reversibly ...
* Stereochemical Integrity: Maintaining the correct stereochemistry of amino acids throughout the synthesis is paramount.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.
* Formation of Thioether Bridges: Achieving regioselective and efficient formation of all required thioether cross-links is a major synthetic challenge.Optimized enzymatic synthesis of C-terminal peptide ...
* Purification: Isolating the final, highly modified peptide in pure form can be difficult.
Despite these challenges, advancements in SPPS methodologies, including the development of new resins, coupling reagents, and protecting group strategies, continue to facilitate the synthesis of increasingly complex peptides. Furthermore, chemoenzymatic approaches, which combine chemical synthesis with enzymatic steps, are also being explored as alternative routes to access modified peptides like subtilin.
In summary, the solid-phase peptide synthesis of subtilin total synthesis represents a sophisticated application of modern chemical techniques to tackle a challenging natural product. By leveraging the power of SPPS for linear chain assembly and developing specific strategies to introduce the characteristic thioether cross-links and unusual amino acids, researchers aim to provide access to this important lantibiotic and its analogs for further study and potential therapeutic applications.
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