Solid-phase synthesis of arginine-containing peptides and fluorogenic substrates using a side-chain anchoring approach |
| |
Authors: | Hamzé Abdallah Martinez Jean Hernandez Jean-François |
| |
Institution: | Laboratoire des Aminoacides Peptides et Protéines, CNRS UMR 5810, Universités Montpellier I et II, Faculté de Pharmacie, 15 avenue Charles Flahault, BP 14491, 34093 Montpellier cédex 5, France. |
| |
Abstract: | Attachment of an amino acid to a solid support by its side chain is sometimes necessary to take advantage of an alpha-carboxylic group available for diverse modifications, including the incorporation of a fluorophore for the preparation of fluorogenic substrates. In contrast to most other amino acids, anchoring the guanidinium group of an arginine to a resin requires the use of a supplementary linker. To avoid the usually multistep synthesis of such a linker as well as its difficult attachment to the guanidine group, we developed a simple method where the guanidine group is built on a Rink amide resin. Our strategy followed the steps of guanidine formation: (i) addition of an isothiocyanate derivative of ornithine to the amino group of a solid support, yielding Nomega-linked thiocitrulline; (ii) S-methylation of thiourea; (iii) guanidinylation using ammonium acetate. Cleavage of the resin generated the arginine-containing compound, the amine group of the resin becoming part of the guanidine. We have demonstrated the usefulness of this method by the synthesis of a series of fluorogenic substrates for trypsin-like serine proteases, which were obtained in high yield and purity. Then, our strategy also allowed generation from the same precursor differentially substituted arginine derivatives, including Nomega-methyl- and Nomega-ethylarginines. The ability to prepare such analogues together with the intermediates thiocitrulline and S-methylisothiocitrulline from a unique precursor while the alpha-amine and carboxylic groups remain available for modification also makes this method a powerful tool for combinatorial solid-phase synthesis of NO synthase inhibitors. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|