Efficient Preparation of Organic Substrate−RNA Conjugates via in Vitro Transcription
摘要:
A concise synthetic way has been developed for the preparation of guanosine monophosphate derivatives carrying a decaethylene glycol spacer at their 5'-oxygen to which are attached a range of organic substrates. The four different compounds, prepared via a convergent synthetic strategy, carry a tethered benzylallyl ether residue (1a), an anthracene (1b), a benzyl carbamate residue (1c), or a primary amino group (1d), respectively. All four compounds have been successfully incorporated at the T-end of a 25-mer long RNA transcript via T7 RNA polymerase, and no inhibition of chain elongation could be observed. Under proper conditions, 1a and 1b can be incorporated up to 90-95% and 1c up to 68%. The amino-terminated initiator Id is incorporated less efficiently although still up to 49%. These results show that the more hydrophobic the guanosine monophosphate derivative is, the higher is its enzymatic incorporation.
Structural Optimization of Non-Nucleotide Loop Replacements for Duplex and Triplex DNAs
作者:Squire Rumney、Eric T. Kool
DOI:10.1021/ja00126a004
日期:1995.5
greater thermal stability than one with a natural T(4) loop. In the triplex series, the loop replacements were examined in four separate situations, in which the loop lies in the 5' or 3' orientation and the central purine target strand is short or extends beyond the loop. Results show that in all cases the loop derived from octakis(ethylene glycol) (EG(8)) gives the greatest stability. In the cases
描述了系统地探索使用乙二醇 (EG) 寡聚体作为双链体和三链体 DNA 中核苷酸环的非核苷酸替代物的结构效应的研究。与先前描述的基于 EG 的接头相比,新的结构优化的环替换在双链体和三链体中更加稳定。一系列长度从三(乙二醇)到八(乙二醇)的化合物被衍生为一端的单二甲氧基三苯甲基醚和另一端的亚磷酰胺,以便能够通过自动化方法将它们整合到 DNA 链中。这些接头分子在扩展构象中的长度范围为 13 到 31 Å。它们被整合到一系列形成双链体和形成三链体的序列中,并通过热变性来测量相应螺旋的稳定性。在双链体系列中,结果表明最佳接头是源自七(乙二醇)的接头,它比之前研究的大多数环替换更长。这提供了比具有天然 T(4) 环的螺旋具有更高的热稳定性。在三链体系列中,环替换在四种不同的情况下进行了检查,其中环位于 5' 或 3' 方向,中央嘌呤靶链很短或延伸到环之外。结果表明,在所有情况下,源自八基(乙二醇
Stepwise PEG synthesis featuring deprotection and coupling in one pot
作者:Logan Mikesell、Dhananjani N A M Eriyagama、Yipeng Yin、Bao-Yuan Lu、Shiyue Fang
DOI:10.3762/bjoc.17.207
日期:——
more convenientapproach for PEG synthesis featuring the use of a base-labile protecting group such as the phenethyl group. Using this approach, each elongation of PEG can be achieved in two steps – deprotection and coupling – in only one pot. The deprotonation step, and the isolation and purification of the intermediate product after deprotection using existing approaches are no longer needed when the
Solid Phase Stepwise Synthesis of Polyethylene Glycols
作者:Ashok Khanal、Shiyue Fang
DOI:10.1002/chem.201703004
日期:2017.10.26
polystyrene solid support. The monomer contains a tosyl group at one end and a dimethoxytrityl group at the other. The Wang resin, which contains the 4‐benzyloxy benzyl alcohol function, was used as the support. The synthetic cycle consists of deprotonation, Williamson ether formation (coupling), and detritylation. Cleavage of PEGs from solid support was achieved with trifluoroacetic acid. The synthesis including
通过在聚苯乙烯固体载体上逐步添加四乙二醇单体来合成聚乙二醇(PEG)以及具有八个和十二个乙二醇单元的衍生物。该单体一端含有甲苯磺酰基,另一端含有二甲氧基三苯甲基。使用含有 4-苄氧基苯甲醇官能团的 Wang 树脂作为载体。合成循环包括去质子化、威廉姆森醚形成(偶联)和去三苯甲基化。用三氟乙酸实现 PEG 从固体支持物上的裂解。包括单体合成在内的合成完全无需色谱法。以高产率获得了两端具有不同功能的 PEG 产物。使用 ESI 和 MALDI-TOF MS 对产物进行分析,发现产物接近单分散性。
Nucleic acid ligand complexes
申请人:Gold Larry
公开号:US20050164974A1
公开(公告)日:2005-07-28
This invention discloses a method for preparing a therapeutic or diagnostic complex comprised of a nucleic acid ligand and a lipophilic compound or non-immunogenic, high molecular weight compound by identifying a nucleic acid ligand by SELEX methodology and associating the nucleic acid ligand with a lipophilic compound or a non-immunogenic, high molecular weight compound. The invention further discloses complexes comprising one or more nucleic acid ligands in association with a lipophilic compound or non-immunogenic, high molecular weight compound.
This invention discloses a method for preparing a therapeutic or diagnostic complex comprised of a nucleic acid ligand and a lipophilic compound or non-immunogenic, high molecular weight compound by identifying a nucleic acid ligand by SELEX methodology and associating the nucleic acid ligand with a lipophilic compound or a non-immunogenic, high molecular weight compound. The invention further discloses complexes comprising one or more nucleic acid ligands in association with a lipophilic compound or non-immunogenic, high molecular weight compound.