Native chemical ligation using removable Nα-(1-phenyl-2-mercaptoethyl) auxiliaries
作者:Paolo Botti、Michael R Carrasco、Stephen B.H Kent
DOI:10.1016/s0040-4039(01)00036-3
日期:2001.3
methodology to extendnativechemicalligation is presented. This method makes use of a novel 1-phenyl-2-mercaptoethyl auxiliary moiety on the α-amino group of a first peptide segment, the auxiliary acts as a 1-amino-2-thiol-containing functional group to effect thioester-mediated, amide-forming ligation with a second thioester-containing peptide. Subsequent facile removal of the auxiliary from the newly
The invention is directed to methods and compositions for chemical ligation of components comprising a first component having a carboxythioester, and preferable an &agr;-carboxythioester, moiety and a second component having an N-substituted, and preferably an N&agr;-substituted, 2 or 3 carbon chain alkyl or aryl thiol to give a ligation product having an N-substituted amide bond at the ligation site. The reactants of the invention are chemoselective, and the alkyl or aryl thiol moiety is removable from the ligation product. Removal of the alkyl or aryl thiol gives a native amide bond at the ligation site. The methods and compositions of the invention are particularly useful for ligation of peptides and polypeptides. The ligation system of the invention is applicable to a wide variety of molecules, and thus can be exploited to generate peptides, polypeptides and other amino acid containing polymers having a native amide bond at the ligation site.
Synthesis of <i>N</i><sup>α</sup>-(1-Phenyl-2-mercaptoethyl) Amino Acids, New Building Blocks for Ligation and Cyclization at Non-Cysteine Sites: Scope and Limitations in Peptide Synthesis
作者:Sylvie Tchertchian、Oliver Hartley、Paolo Botti
DOI:10.1021/jo049471k
日期:2004.12.1
yielded the desired peptide fragments. However, the coupling of the two alanine derivative diastereomers generated some epimerization. Finally, N-terminal auxiliary glycine and alanine peptides were cyclized, and the corresponding native circular peptides were obtained upon successful removal of the auxiliary.