Stereochemistry and Conformation of Skyllamycin, a Non-Ribosomally Synthesized Peptide from<i>Streptomyces</i>sp. Acta 2897
作者:Vivien Schubert、Florent Di Meo、Pierre-Loïc Saaidi、Stefan Bartoschek、Hans-Peter Fiedler、Patrick Trouillas、Roderich D. Süssmuth
DOI:10.1002/chem.201304562
日期:2014.4.22
Skyllamycin is a non‐ribosomally synthesized cyclic depsipeptide from Streptomyces sp. Acta 2897 that inhibits PDGF‐signaling. The peptide scaffold contains an N‐terminal cinnamoyl moiety, a β‐methylation of aspartic acid, three β‐hydroxylated amino acids and one rarely occurring α‐hydroxy glycine. With the exception of α‐hydroxy glycine, the stereochemistry of the amino acids was assigned by comparison
Skyllamycin是来自链霉菌属的非核糖体合成的环状双缩肽。抑制PDGF信号的Acta 2897。肽支架包含一个N末端的肉桂酰基部分,一个天冬氨酸的β-甲基化,三个β-羟基化氨基酸和一个罕见的α-羟基甘氨酸。除α-羟基甘氨酸外,通过手性GC-MS和Marfey-HPLC分析将氨基酸的立体化学与合成参考氨基酸进行比较。在碱性和酸性条件下不稳定的α-羟基甘氨酸的立体化学是通过构象分析,结合NOESY-NMR光谱,模拟退火和自由MD模拟的数据确定的。模拟程序适用于R-和Skyllamycin结构的S-构型α-羟基甘氨酸,并与NOESY数据进行比较。两种方法(模拟退火和自由MD模拟)均独立支持S配置的α-羟基甘氨酸,从而实现了Skyllamycin结构中所有立体中心的分配,并将两组分黄素依赖性单加氧酶(Sky39)发挥了S选择性的作用。