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。
The coupling reactions of 3-phenylpropanoic acid and N-carboxybenzyl α-aminoacids with unprotected α-aminoacids containing hydrophilic side chains such as aliphatic alcohol, aromatic alcohol, thiol, carboxylic acid, and amide afforded the corresponding amides in 66–96% yield without racemization via the corresponding mixed carbonic carboxylic anhydrides under basic conditions through an ecological
Peptide coupling of unprotected amino acids through in situ p-nitrophenyl ester formation
作者:Paul Gagnon、Xicai Huang、Eric Therrien、Jeffrey W. Keillor
DOI:10.1016/s0040-4039(02)01840-3
日期:2002.10
series of dipeptides and tripeptides were prepared via an activation–coupling method involving the in situ formation of a p-nitrophenyl ester of an (N-protected) aminoacid, followed by coupling with an unprotected aminoacid in partially aqueous solutions. The resulting peptide is easily isolated by precipitation. In general, the yields obtained are good to excellent and racemization is minimal. This
Abstract A convenient synthesis of chiral N-, O-, and S-acyl monoiso- and diisopeptides from di- and tripeptides containing tryptophan, tyrosine, and cysteine units using benzotriazole is reported in solution phase. A convenient synthesis of chiral N-, O-, and S-acyl monoiso- and diisopeptides from di- and tripeptides containing tryptophan, tyrosine, and cysteine units using benzotriazole is reported
Convenient Peptide Synthesis Using Unprotected α-Amino Acids Containing Another Hydrophilic Moiety under Basic Conditions
作者:Takuya Noguchi、Seunghee Jung、Nobuyuki Imai
DOI:10.1246/cl.2012.577
日期:2012.6.5
Carboxylic acids 1 and 7 reacted effectively with unprotected α-amino acids 2 containing another hydrophilic moiety under basic conditions via activation by ethyl chloroformate and triethylamine to afford the corresponding amides in 74–99% yields.
Solid-Phase Synthesis of 1,3-Azole-Based Peptides and Peptidomimetics
作者:Eric Biron、Jayanta Chatterjee、Horst Kessler
DOI:10.1021/ol0607645
日期:2006.5.1
[graphics]We report highly efficient two-step procedures for the synthesis of 1,3-oxazole-, thiazole-, and imidazole- containing peptides on solid phase from dipeptides composed of C-terminal threonine, serine, cysteine, or diaminopropionic acid by using different cyclodehydration procedures followed or preceded by oxidation. The methods are compatible with Fmoc solid-phase peptide synthesis conditions and with N-Fmoc, N-Boc, N-Cbz, and N-Alloc protecting groups.