Conversion of S-phenylsulfonylcysteine residues to mixed disulfides at pH 4.0: utility in protein thiol blocking and in protein-S-nitrosothiol detection
作者:B. D. Reeves、N. Joshi、G. C. Campanello、J. K. Hilmer、L. Chetia、J. A. Vance、J. N. Reinschmidt、C. G. Miller、D. P. Giedroc、E. A. Dratz、D. J. Singel、P. A. Grieco
DOI:10.1039/c4ob00995a
日期:——
A protocol denoted as the thiosulfonate switch featuring sequential protein thiol blocking and conversion of protein-S-nitrosothiols to mixed disulfides bearing a fluorescent probe at pH 4.0 is reported.
Due to its ability to reversibly crosslink proteins, cysteine has a unique role as an amino acid in nature. For controlled, asymmetric formation of disulfides from two thiols, one thiol needs to be activated. While few activating groups for cysteine have been proposed, they are usually not stable against amines making them unsuitable for solid phase peptide synthesis or amine initiated polymerization
Some observations concerning the S-nitroso and S-phenylsulphonyl derivatives of L-cysteine and glutathione
作者:Terance W. Hart
DOI:10.1016/s0040-4039(00)98368-0
日期:1985.1
The preparation of the thiolsulphonate derivatives 3 and 7 of L-cysteine and glutathione, respectively, their corresponding S-nitroso derivatives 2 and 6, is described.
carboxylic acid and ester building blocks by diazotization of S-sulfonyl-cysteines. The thiosulfonate protecting group demonstrated resistance to oxidation and attenuation of sulfur's nucleophilicity by the anomeric effect. The key transformation was optimized by a 22 factorial design of experiment, highlighting the unique reactivity of cysteine derivatives in comparison with aliphatic amino acids.