Assessment of solution-phase positional scanning libraries based on distamycin A for the discovery of new DNA binding agents
摘要:
The solution-phase synthesis of two 1000-membered positional scanning libraries of distamycin A analogues is described enlisting acid/base liquid-liquid extractions for isolation and purification of all intermediates and final products. The results of their screening for functional activity (L1210 cytotoxic potency) and DNA binding affinity were compared with those derived from libraries containing the same compound members but prepared in a smaller 10-compound mixture format. The positional scanning libraries, which are substantially less demanding to prepare, allowed the accurate detection of the glob;ll observations and the clearly more potent activities, but more subtle discoveries and less distinguishable activities were not detected. This is a natural consequence of testing the larger 100-compound mixtures and the relative insensitivity of the assays to the contribution of any single, uniquely acting compound in the mixture. Thus, the disadvantages associated with the loss of some information contained within the library must be balanced against the advantages of the ease of library synthesis and judged in light of the library screening objectives. (C) 2000 Elsevier Science Ltd. All rights reserved.
Distamycin A 和 2640 类似物的全合成:一种用于发现新的生物活性 DNA 结合剂和开发用于确定相对 DNA 结合亲和力或 DNA 结合序列选择性的快速、高通量筛选的液相组合方法
摘要:
描述了远霉素 A 的液相合成的发展及其对 2640 类似物制备的扩展。因此,采用酸/碱液-液萃取进行反应后处理和纯化的液相合成技术用于多步制备偏霉素 A(8 步,40% 总产率)和 2640 类似物的原型库,提供中间体和最终产品在常规反应规模上纯度≥95%。公开了一种简单、快速和高通量的 DNA 结合亲和力筛选的补充开发,该筛选基于来自预结合溴化乙锭置换的荧光损失,适用于评估对 DNA 均聚物或特定序列的相对或绝对结合亲和力。发夹寡核苷酸)。使用发夹寡核苷酸,