Hexafluoro-2-propanol as a potent cosolvent for chemical ligation of membrane proteins
摘要:
膜蛋白的研究是一项重要挑战,这主要是因为它们在各种溶剂中的溶解性极差。传统的重组表达策略和天然化学连接方法都难以高效地产生足够数量的所需蛋白质。先前的研究表明,多氟化醇具有良好的难溶肽段溶解能力,尤其是六氟-2-丙醇(HFIP)。在本研究中,我们系统地研究了含有不同比例HFIP的溶剂对跨膜肽溶解能力的系统研究。通过HPLC和UV分析,我们得出结论,60% HFIP/8 M urea构成了一种良好的溶剂体系。在此溶剂体系中,我们还优化了进行天然化学连接(NCL)的条件。在优化的条件下,我们成功实现了二肽形成和模型蛋白质(Trifolitoxin)合成的NCL。这些结果表明,HFIP是一种潜在的共溶剂,可用于连接难溶肽段以生成膜蛋白。
HMDO-Promoted Peptide and Protein Synthesis in Ionic Liquids
作者:Jianli Duan、Yao Sun、Hao Chen、Guofu Qiu、Haibing Zhou、Ting Tang、Zixin Deng、Xuechuan Hong
DOI:10.1021/jo400797t
日期:2013.7.19
Hexamethyldisiloxane (HMDO) has been developed to efficiently promote the metal-free direct coupling of an amino function of one cysteine-free peptide or protein and a C-terminal thioester of the second peptide in ionic liquids. The amide-coupling reaction proceeds smoothly under mild conditions to afford the corresponding products in good to excellent yields (63-94%). Peptide couplings were also achieved using in-situ-generated thioesters by the thioesterification of oxo esters.
Peptide ligation assisted by an auxiliary attached to amidyl nitrogen
作者:Juan Li、Hong-Kui Cui、Lei Liu
DOI:10.1016/j.tetlet.2010.01.108
日期:2010.3
New thiol-containing auxiliaries were developed for peptide ligation. They were placed at the amidyl N-atom in the second amino acid residue of a peptide fragment. With the new auxiliaries, peptide ligation could be conducted at non-Cys and non-Gly sites. Compared to other recently developed auxiliaries, an important feature of the present design was that the new auxiliaries were generally applicable and readily removable. (C) 2010 Elsevier Ltd. All rights reserved.