Conjugation of Selenols with Aziridine-2-Carboxylic Acid-Containing Peptides
作者:David Y. Gin、Nathan D. Ide、Danica P. Galonić、Wilfred A. van der Donk
DOI:10.1055/s-2005-871972
日期:——
The addition of PhSeH to aziridine-2-carboxylic acid containing peptides is described, thus expanding the scope of nucleophiles for the opening of this class of electrophilic peptide substrates. The process offers a new strategy for the generation of useful phenylselenocysteine derivatives and α-seleno-β-amino acid-containing peptides.
Aziridine-2-carboxylic Acid-Containing Peptides: Application to Solution- and Solid-Phase Convergent Site-Selective Peptide Modification
作者:Danica P. Galonić、Nathan D. Ide、Wilfred A. van der Donk、David Y. Gin
DOI:10.1021/ja050304r
日期:2005.5.25
The development of a method for site- and stereoselective peptide modification using aziridine2-carboxylic acid-containing peptides is described. A solid-phase peptide synthesis methodology that allows for the rapid generation of peptides incorporating the aziridine residue has been developed. The unique electrophilic nature of this nonproteinogenic amino acid allows for site-selective conjugation with various thiol nucleophiles, such as anomeric carbohydrate thiols, farnesyl thiol, and biochemical tags, both in solution and on solid support. This strategy, combined with native chemical ligation, provides convergent and rapid access to complex thioglycoconjugates.
Ring-Opening of Aziridine-2-Carboxamides with Carbohydrate C1-<i>O</i>-Nucleophiles. Stereoselective Preparation of α- and β-<i>O</i>-Glycosyl Serine Conjugates
作者:Daniel A. Ryan、David Y. Gin
DOI:10.1021/ja804589j
日期:2008.11.19
The stereoselective formation of the alpha-GalNAc-Ser linkage via the ring opening of aziridine-2-carboxamides with pyranose C1-O-nucleophiles is described. The process is tolerant to the native C2-NHAc group, can be modulated to provide either the alpha- or beta-glycoside through judicious choice of solvent and metal counterion, and is amenable to other classes of O-glycosyl-Ser constructs such as the B-GlcNAc-Ser and alpha-Man-Ser linkages. This coupling reaction also led to the development of the o-allylbenzyl (ABn) moiety as a new C-terminus carboxyl protective group, which allows for the use of novel methods for N- and C-terminus extension of amino acids following carbohydrate conjugation.