Total Synthesis of Deamido Bleomycin A<sub>2</sub>, the Major Catabolite of the Antitumor Agent Bleomycin
作者:Ying Zou、Nour Eddine Fahmi、Corine Vialas、Guy M. Miller、Sidney M. Hecht
DOI:10.1021/ja012741l
日期:2002.8.1
and (1)H NMR spectroscopy. Deamido bleomycin A(2) was found to retain significant DNA cleavage activity in DNA plasmid relaxation assays and had the same sequence selectivity of DNA cleavage as bleomycin A(2). The most significant alteration of function noted in this study was a reduction in the ability of deamido bleomycin A(2) to mediate double-strand DNA cleavage, relative to that produced by BLM
抗肿瘤抗生素博来霉素的代谢失活被认为仅通过博来霉素水解酶的作用介导,博来霉素水解酶是一种在自然界中广泛分布的半胱氨酸蛋白酶。虽然博来霉素表现出的抗肿瘤活性谱被认为反映了博来霉素水解酶在宿主体内的解剖分布,但很少有人在化学或生化水平上表征推定失活的产物。本报告描述了 deamidobleomycin demethyl A(2) (3) 和 deamido bleomycin A(2) (4) 的合成,以及各自的苷元。这些化合物都可以通过关键中间体 N(alpha)-Boc-N(beta)-[1-amino-3(S)-(4-amino-6-carboxy-5-methylpyrimidin-2-yl)propion- 3-基]-(S)-β-氨基丙氨酸叔丁酯(16)。合成 deamido 博来霉素 A(2) 显示与博来霉素 A(2) 与人博来霉素水解酶处理形成的产品相同,如反相 HPLC 分析和