Adenophostins A and B: Potent agonists of inositol-1,4,5-trisphosphate receptor produced by Penicillium brevicompactum. Structure elucidation.
作者:SHUJI TAKAHASHI、TAKESHI KINOSHITA、MASAAKI TAKAHASHI
DOI:10.7164/antibiotics.47.95
日期:——
Adenophostins A (1, C16H26N5O18P3) and B (2, C18H28N5O19P3), potent agonists of inositol-l, 4, 5-trisphosphate (InsP3) receptor, were isolated from the culture broths of Penicillium brevicompactum SANK 11991 and SANK 12177. Hydrolysis of 2 with aq NaOH gave 1. Oxidation of 2 with NaNO2 gave the hypoxanthine derivative (3). Treatment of 1 or 2 with alkaline phosphatase gave 4 and 5. Treatment of 4 with a-glucosidase gave adenosine. Thus, their structures were deduced to be adenosine nucleotides by NMR, MS and the enzymatic degradation. The inhibitory constants (Ki value) of 1, 2, 3 and InsP3 itself for binding to the InsP3 receptor were 0.18 nM, 0.18 nM, 0.29 nM and 15 nM, respectively.
腺苷 A(1,C16H26N5O18P3)和腺苷 B(2,C18H28N5O19P3)是肌醇-1,4,5-三磷酸酯(InsP3)受体的强效激动剂,它们是从青霉 SANK 11991 和 SANK 12177 的培养液中分离出来的。用 NaOH 溶液水解 2 得到 1。用 NaNO2 氧化 2 得到次黄嘌呤衍生物(3)。用碱性磷酸酶处理 1 或 2,得到 4 和 5。用 a-葡萄糖苷酶处理 4 得到腺苷。因此,通过核磁共振、质谱和酶降解推断出它们的结构是腺苷核苷酸。1、2、3 和 InsP3 本身与 InsP3 受体结合的抑制常数(Ki 值)分别为 0.18 nM、0.18 nM、0.29 nM 和 15 nM。