chemical-synthesis-of-subtilin-solid-phase-peptide-synthesis The chemical synthesis of haloduracin represents a significant area of research within peptide chemistry, particularly when employing solid-phase peptide synthesis (SPPS) techniques. Haloduracin, a two-peptide lantibiotic, exhibits potent antimicrobial activity that relies on the synergistic interaction between its constituent modified peptides.作者：X Zhang·2009·被引用次数：6—The analogues were synthesized with appropriate protecting groups for Fmoc‐basedsolid‐phase peptide synthesis(Li and van der Donk, 2007, Zhang et al., 2005, ... Understanding its synthesis is crucial for developing new antimicrobial agents, especially in the face of rising antibiotic resistance作者：HR Karbalaei-Heidari·2020·被引用次数：30—A wide range of technologies are at our disposal for producing apeptidesuch aschemical synthesis, recombinant DNA technologies, and in vitro translation ....
Haloduracin is classified as a lantibiotic, a group of ribosomally synthesized and post-translationally modified peptides. These modifications are critical for their mature, antimicrobial function2025年8月9日—Additionally, lantibiotics can be produced throughsolid-phase peptide synthesis(SPPS) using orthogonally protected lanthionine rings (31, 33).. The biological activity of haloduracin is directly linked to the presence and interaction of its two distinct peptides, often referred to as haloduracin alpha and haloduracin beta作者：X Zhang·2009·被引用次数：6—The analogues were synthesized with appropriate protecting groups for Fmoc‐basedsolid‐phase peptide synthesis(Li and van der Donk, 2007, Zhang et al., 2005, .... The unique structural features, including the presence of lanthionine rings and thioether cross-links, contribute to their stability and efficacy.
Solid-phase peptide synthesis (SPPS) has become a cornerstone technique for the chemical synthesis of peptides, including complex molecules like haloduracin.Solvents for Solid Phase Peptide Synthesis This method involves anchoring the growing peptide chain to an insoluble solid support, typically a resin. This approach offers several advantages over traditional solution-phase methods:
* Ease of Purification: Excess reagents and by-products can be easily washed away, simplifying the purification process at each step.Solvents for Solid Phase Peptide Synthesis
* Automation: SPPS is highly amenable to automation, allowing for the rapid synthesis of multiple peptide sequences and libraries.
* Efficiency: By using an excess of reagents, the reactions can be driven to completion, leading to higher yields.
The most common strategies for SPPS involve either Fmoc (9-fluorenylmethoxycarbonyl) or Boc (tert-butyloxycarbonyl) chemistry for protecting the alpha-amino group of the amino acids.Investigation of the Substrate Specificity of Lacticin 481 ... Fmoc-based SPPS is widely favored due to its milder deprotection conditions, which are compatible with a broader range of sensitive functional groups and protecting groups, making it particularly suitable for the synthesis of modified peptides like haloduracinsolid phase peptide.
The chemical synthesis of haloduracin involves several key challenges, primarily related to the incorporation of modified amino acids and the formation of thioether cross-links. Researchers have employed various strategies to achieve this:
1Standard practices for Fmoc-based solid-phase peptide .... Fmoc-Based SPPS: This is the predominant approach. Protected amino acid building blocks are sequentially coupled to the growing peptide chain on a solid support. The choice of orthogonal protecting groups for side chains is critical to prevent unwanted reactions during synthesis and to allow for selective deprotection later.
2. Incorporation of Modified Amino Acids: Lantibiotics like haloduracin contain unusual amino acids, such as dehydroalanine and dehydrobutyrine, which are precursors to the thioether cross-links. These can be introduced either by using pre-modified building blocks or by post-synthetic modification of the peptide after cleavage from the resin.Chemical Synthesis of the Lantibiotic Lacticin 481 Reveals ...
3. Cyclization and Cross-linking: The characteristic thioether bridges in haloduracin are formed through intramolecular cyclization reactions. These reactions often occur after the peptide has been synthesized and cleaved from the solid support, or sometimes *in situ* on the resin under specific conditionsSolid Phase Synthesis. The precise regiochemistry and stereochemistry of these cross-links are crucial for the peptide's activity.
4. Total Synthesis: The complete chemical synthesis of haloduracin and its analogues allows for detailed structure-activity relationship (SAR) studies.作者：H Liu·2010·被引用次数：1—In this thesis, the central theme ischemical synthesisof naturally occurring cyclicpeptidesand their analogues combined with the examination of their ... By systematically modifying different parts of the molecule, researchers can better understand which structural features are essential for antimicrobial activity and how to optimize these properties.
The successful chemical synthesis of haloduracin and related lantibiotics opens doors for several applications. Their potent antimicrobial activity makes them promising candidates for combating drug-resistant bacteria2023·被引用次数：3—The strategy involves thesolid-phase synthesisof sulfamidate-containingpeptidesfollowed by late-stage intra- molecular cyclization. This .... Furthermore, the ability to synthesize analogues with enhanced properties, such as improved stability, bioavailability, or spectrum of activity, is a key area of ongoing research. Advances in SPPS, including novel coupling reagents, resins, and automated synthesizers, continue to push the boundaries of what can be synthesized, making complex peptides like haloduracin more accessible for therapeutic development and scientific investigation.
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