Total synthesis of the large non-ribosomal peptide polytheonamide B
摘要:
聚糖酰胺 B 是目前已知的最大的非核糖体肽,具有非凡的细胞毒性(EC50 = 68 pg mlâ1, 小鼠白血病 P388 细胞)。它的 48 个氨基酸残基包括多种非蛋白原性 d 和 l 氨基酸,这些氨基酸的绝对立体化学结构依次交替。这些结构特征促使形成稳定的δ-strand 型结构,从而形成长度超过 30 Ã 的整体管状结构。在生物环境中,这种折叠结构被认为可以通过一个孔隙在脂质双分子层中运输阳离子,从而起到离子通道的作用。在此,我们首次报告了聚神酰胺 B 的化学结构。我们的合成依赖于四个关键阶段的结合:非蛋白源氨基酸的合成、聚草酰胺 B 四个片段的固相组装、银介导的片段连接以及最后的全局脱保护。现在可用的合成材料将有助于研究其构象特性、通道功能和细胞毒性之间的关系。聚神酰胺 B 是一种大型非核糖体多肽,具有极高的生物活性。本文描述的合成包括首次制备几种非蛋白源氨基酸和大型非天然肽的一般偶联策略。该合成是了解和利用该化合物及类似化合物生物活性的关键一步。
Solid-Phase Total Synthesis and Dual Mechanism of Action of the Channel-Forming 48-mer Peptide Polytheonamide B
作者:Atsushi Hayata、Hiroaki Itoh、Masayuki Inoue
DOI:10.1021/jacs.8b06755
日期:2018.8.22
unusual residues significantly heightened the synthetic challenges, impeding the solid-phasepeptidesynthesis (SPPS) of 1. In this study, we first addressed the synthesis problem by extensive optimization of various factors of the SPPS. Adaptation of a new protective group strategy allowed for elongation of a 37-mer peptide on resin, to which an N-terminal 11-mer fragment was condensed. Removal of the
Structural Permutation of Potent Cytotoxin, Polytheonamide B: Discovery of Cytotoxic Peptide with Altered Activity
作者:Hiroaki Itoh、Masayuki Inoue
DOI:10.1021/ml300264c
日期:2013.1.10
PolytheonamideB (1) is an ion-channel forming natural peptide with a d,l-alternating 48 amino acid sequence, which is an exceedingly potent cytotoxin. We recently designed and synthesized a simplified dansylated polytheonamide mimic 2, in which six amino acid residues were modified from 1, and demonstrated that 2 emulated the functions of 1. Here we report a comprehensive structure–activity relationship
Longer is better: PolytheonamideB, the largest nonribosomal linear peptide identified to date, is a transmembrane channel‐forming peptide. Nine of its substructures have now been chemically synthesized. The membrane‐disrupting and ion‐channel‐forming sequences as well as the cytotoxicity‐enhancing sequence have been identified.
l-β,β-Dimethylmethionine S-oxide is a unique amino acid found in polytheonamides. Four designed hexapeptides containing the sulfide, (SR)-sulfoxide, (SS)-sulfoxide, and sulfone derivatives of l-dimethylmethionine were synthesized and functionally analyzed. Our results indicate that the sulfoxide stereochemistry of the peptides controls their overall physicochemical properties.
METHOD FOR PREPARING OPTICALLY ACTIVE AMINO ACID USING COSUBSTRATE SHUTTLING OF TRANSAMINASE
申请人:INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY
公开号:US20150284750A1
公开(公告)日:2015-10-08
The present disclosure relates to a method for preparing an optically active amino acid using cosubstrate shuttling of transaminase. The method includes coupling a reaction of converting a keto acid to an amino acid by α-transaminase and a reaction of transferring an amino group of an amine substrate by ω-transaminase (TA) using an amino acid cosubstrate. The present disclosure allows production of various optically active amino acids with high purity and high efficiency by solving the low equilibrium constant problem of transaminase and is applicable to production of various optically active amino acids in industrial scale. Since the present disclosure allows easy production of various unnatural amino acids having high reactivity and stability, which are used as pharmaceutical precursors, it can be usefully employed in preparation of pharmaceuticals, food additives and various animal feeds.