Effect of a Bromo Substituent on the Glutathione Peroxidase Activity of a Pyridoxine-like Diselenide
作者:Vijay P. Singh、Jia-fei Poon、Ray J. Butcher、Xi Lu、Gemma Mestres、Marjam Karlsson Ott、Lars Engman
DOI:10.1021/acs.joc.5b00797
日期:2015.8.7
In search for better mimics of the glutathione peroxidase enzymes, pyridoxine-like diselenides 6 and 11, carrying a 6-bromo substituent, were prepared. Reaction of 2,6-dibromo-3-pyridinol 5 with sodium diselenide provided 6 via aromatic nucleophilic substitution of the 2-bromo substituent. LiAlH4 caused reduction of all four ester groups and returned 11 after acidic workup. The X-ray structure of 6 showed that the dipyridyl diselenide moiety was kept in an almost planar, transoid conformation. According to NBO-analysis, this was due to weak intramolecular Se center dot center dot center dot O (1.1 kcal/mol) and Se center dot center dot center dot N-interactions (2.5 kcal/mol). That the 6-bromo substituent increased the positive charge on selenium was confirmed by NPA-analysis and seen in calculated and observed Se-77 NMR-shifts. Diselenide 6 showed a more than 3-fold higher reactivity than the corresponding des-bromo compound 3a and ebselen when evaluated in the coupled reductase assay. Experiments followed for longer time (2 h) confirmed that diselenide 6 is a better GPx-catalyst than 11. On the basis of Se-77-NMR experiments, a catalytic mechanism for diselenide 6 was proposed involving selenol, selenosulfide and seleninic acid intermediates. At low concentration (10 mu M) where it showed only minimal toxicity, it could scavenge ROS produced by MNC- and PMNC-cells more efficiently than Trolox.