Water soluble reagents and methods for the formation of an amide bond between a phosphinothioester and an azide in an aqueous medium. The phosphinothioester is generated using a water-soluble phosphinothiol reagent. This reaction allows formation of an amide bond between a wide variety of chemical species including amino acids, peptides or protein fragments in an aqueous solution. Of particular interest, this reaction allows for the formation of an amide bond in a physiological setting. In a specific embodiment, this invention provides reagents and methods for peptide ligation in an aqueous medium. The reaction eliminates the need for a cysteine residue and is traceless leaving no residual atoms in the ligated peptide product.
Coulombic effects on the traceless Staudinger ligation in water
作者:Annie Tam、Ronald T. Raines
DOI:10.1016/j.bmc.2008.02.047
日期:2009.2
The tracelessStaudingerligation can be mediated by phosphinothiols under physiological conditions. Proximal positive charges are necessary to achieve that transformation, presumably because those charges discourage protonation of the key iminophosphorane intermediate. Here, a series of cationic phosphinothiols is used to probe Coulombic effects on the tracelessStaudingerligation in aqueous buffers
Water-Soluble Phosphinothiols for Traceless Staudinger Ligation and Integration with Expressed Protein Ligation
作者:Annie Tam、Matthew B. Soellner、Ronald T. Raines
DOI:10.1021/ja073204p
日期:2007.9.1
The traceless Staudinger ligation is an effective means to synthesize an amide bond between two groups of otherwise orthogonal reactivity: a phosphinothioester and an azide. An important application of the Staudinger ligation is in the ligation of peptides at a variety of residues. Here, we demonstrate that the traceless Staudinger ligation can be achieved in water with a water-soluble reagent. Those