Biosynthetic Origin of the 3-Amino-2,5,7,8-tetrahydroxy-10-methylundecanoic Acid Moiety and Absolute Configuration of Pahayokolides A and B
作者:Li Liu、Daniel W. Bearden、Kathleen S. Rein
DOI:10.1021/np200362q
日期:2011.6.24
cyclic undecapeptides that were isolated from the cyanobacterium Lyngbya sp. They contain the unusual α-hydroxy-β-amino acid 3-amino-2,5,7,8-tetrahydroxy-10-methylundecanoic acid (Athmu). The absolute configurations of the amino acids of the pahayokolides, except for the four oxygen-bearing stereocenters of Athmu, have been determined by Marphy’s method. Incorporation of labeled leucine and acetate precursors
Pahayokolides A ( 1 ) 和 B ( 2 ) 是从蓝藻Lyngbya sp.中分离出来的环状十一肽。它们含有不寻常的 α-羟基-β-氨基酸 3-氨基-2,5,7,8-四羟基-10-甲基十一烷酸 (Athmu)。除了 Athmu 的四个含氧立体中心外,pahayokolides 氨基酸的绝对构型已通过 Marphy 方法确定。将标记的亮氨酸和乙酸盐前体并入 pahayokolides 已确定 Athmu 源自亮氨酸或 α-酮异己酸起始单元,其进一步扩展为三个乙酸盐单元。