Tyropeptins A and B, New Proteasome Inhibitors Produced by Kitasatospora sp. MK993-dF2. II. Structure Determination and Synthesis.
作者:ISAO MOMOSE、RYUICHI SEKIZAWA、SEHEI HIROSAWA、DAISHIRO IKEDA、HIROSHI NAGANAWA、HIRONOBU IINUMA、TOMIO TAKEUCHI
DOI:10.7164/antibiotics.54.1004
日期:——
The structures of tyropeptins A and B, new proteasome inhibitors produced by Kitasatospora sp. MK993-dF2, were determined by analysis of various NMR experiments. The 1H and 13C NMR of tyropeptins were complicated due to the presence of an aldehyde group. Therefore, tyropeptins were converted to their alcohols by sodium borohydride. These alcohol derivatives gave assignable NMR spectra. The stereochemistry
酪蛋白A和B的结构,Kitasatospora sp。生产的新型蛋白酶体抑制剂。通过分析各种NMR实验确定MK993-dF2。酪蛋白的1 H和13 C NMR由于醛基的存在而变得复杂。因此,酪蛋白被硼氢化钠转化为它们的醇。这些醇衍生物给出可分配的NMR光谱。通过分析来自酪肽的酸水解产物来确定酪肽的立体化学,并通过总合成进一步证实。发现酪蛋白A和B的结构分别是异戊酰基-L-酪氨酰基-L-戊酰基-DL-酪氨酸和正丁酰基-L-酪氨酰基-L-亮氨酰-DL-酪氨酸。