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โพสต์โดย JohnnyCrelp » จันทร์ 30 พ.ค. 2022 6:24 am

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Supported operating systems: Windows, Linux, MAC OS.Cyclic peptide synthesis is a powerful tool for creating libraries of macrocyclic structures. The opportunity to make libraries of macrocycles, which have a binding site of great complexity, has been limited by the synthetic difficulties of making macrocyclic structures.
The earliest methods of making macrocyclic structures utilized a cross-linking reagent. Cross-linking agents react with nucleophilic sites in two or more linear polymers. To form a cyclic structure, the cross-linking agent must have a reactive functional group on one end of the molecule and a nucleophilic site on the other. For example, a bromine atom on one end of the cross-linking agent and an amine nucleophilic site on the other end of the cross-linking agent can be used to form a cyclic structure.
While early macrocyclic structures were made using cross-linking agents, in recent years, advances in solid phase chemistry have made it possible to make cyclic peptides without the use of a cross-linking reagent. Cyclic peptides are formed by attaching one end of the linear polypeptide to a solid support and then reacting the remaining free ends with a second linear polypeptide. Peptide solid supports have been developed that contain one reactive functional group on the solid support and one nucleophilic group on the peptide. The reactive group can be attached to the peptide by using a condensation reaction with a protected amino acid or amino group. A subsequent reaction with a protected carboxylic acid forms the peptide linkage. The nucleophilic group can be attached by reacting the free amino group with a protected carboxylic acid, and reacting the protected carboxylic acid with a free amino group to form a peptide linkage.
This solid phase method of making cyclic peptides is often referred to as a two-step synthesis. That is, the formation of a first cyclic peptide, using a 70238732e0 waggoli

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