DNA molecular glue is a small synthetic ligand that can adhere two single-stranded DNAs that do not spontaneously hybridize with each other. For reversible control of DNA hybridization by an external light stimulus, we have developed a photoswitchable molecular glue for DNA. The photoswitchable molecular glue, NCDA, consists of two guanine-recognizing naphthyridine moieties connected with a photochromic
DNA分子胶是一种小的合成配体,可以将两条不会自发杂交的单链DNA粘附在一起。为了通过外部光刺激可逆地控制 DNA 杂交,我们开发了一种用于 DNA 的光开关分子胶。光开关分子胶 NCDA 由两个识别鸟嘌呤的萘啶部分与光致变色偶氮苯单元连接而成。偶氮苯通过光照射发生可逆的顺/反异构化,这改变了萘啶部分的相对方向和位置,导致 NCDA 与含有 GG 错配的 DNA 结合的光开关。顺式构型中的 NCDA 与 GG 错配序列结合并诱导 DNA 双链体的形成。利用NCDA的光开关绑定特性,
Tripartate poly(ethylene glycol) prodrugs of the open lactone form of camptothecin
作者:Richard B Greenwald、Hong Zhao、Jing Xia
DOI:10.1016/s0968-0896(03)00152-4
日期:2003.6
Two PEG prodrugs utilizing conjugation of PEG through the C-21 acid functionality as well as the C-17 OH group of CPT hydroxy-amide open forms were synthesized and characterized. Both of these open lactone tripartate prodrugs were shown to be water soluble and highly effective in MX-1 mouse xenograph studies. Indirect evidence implies that the initial ester or carbonate bond breaking is esterase mediated in the first step of the cascade of CPT release. (C) 2003 Elsevier Science Ltd. All rights reserved.
Synthesis and properties of a series of β-cyclodextrin/nitrone spin traps for improved superoxide detection
trap without the CD moiety. The resistance of the spin adducts to a reduction process has been evaluated, and the superoxide spin adducts are sensitive to ascorbate and glutathione (GSH), but not to glutathione peroxidase/GSH, reflecting the exposed nature of the nitroxide moiety to the bulk solvent. To understand these results, 2D-ROESY NMRstudies and molecular dynamics pointed to a shallow or surface