A Mild, General,
<scp>Metal‐Free</scp>
Method for Desulfurization of Thiols and Disulfides Induced by
<scp>Visible‐Light</scp>
作者:Wenting Qiu、Shuai Shi、Ruining Li、Xianfeng Lin、Liangming Rao、Zhankui Sun
DOI:10.1002/cjoc.202000607
日期:2021.5
A visible‐light‐induced metal‐free desulfurization method for thiols and disulfides has been explored. This radical desulfurization features mild conditions, robustness, and excellent functionality compatibility. It was successfully applied not only to the desulfurization of small molecules, but also to peptides.
β-Amino-thiols Inhibit the Zinc Metallopeptidase Activity of Tetanus Toxin Light Chain
作者:Loïc Martin、Fabrice Cornille、Pascale Coric、Bernard P. Roques、Marie-Claude Fournié-Zaluski
DOI:10.1021/jm981015z
日期:1998.8.1
Tetanus neurotoxin is a 150-kDa protein produced by Clostridium tetani, which causes the lethal spastic paralytic syndromes of tetanus by blocking inhibitory neurotransmitter release at central synapses. The toxin light chain (50 kDa) has a zinc endopeptidase activity specific for synaptobrevin, an essential component of the neuroexocytosis apparatus. Previous unsuccessful attempts to block the proteolytic activity of this neurotoxin with well-known inhibitors of other zinc proteases led us to study the design of specific inhibitors as a possible drug therapy to prevent the progressive evolution of tetanus following infection. Starting from the synaptobrevin sequence at the level of the cleavage site by tetanus neurotoxin (Gln(76)-Phe(77)), a thiol analogue of glutamine demonstrated inhibitory activities in the millimolar range. A structure-activity relationship performed with this compound led us to determine the requirement for the correct positioning of the thiol group, the primary amino group, and a carboxamide or sulfonamide group on the side chain. This resulted in the design of a beta-amino-(4-sulfamoylphenyl)glycine-thiol, the first significantly efficient inhibitor of tetanus neurotoxin with a K-i value of 35 +/- 5 mu M.