Superactivation of the Botulinum Neurotoxin Serotype A Light Chain Metalloprotease: A New Wrinkle in Botulinum Neurotoxin
摘要:
Small molecules based upon a 2-acylguanidine-5-phenyl thiophene scaffold that can activate the light chain metalloprotease of botulinum neurotoxin serotype A (BoNT LC/A) by an apparent reduction in Km are reported. On the basis of structure-activity relationships and the activation profile, one or more molecules of activator specifically bind to a defined site on the toxin, causing the observed rate enhancement. With the ever-growing clinical uses of BoNT, compounds such as those reported here may provide a method for combating the emerging adaptive immune responses to BoNT.
Installation of Minimal Tetrazines through Silver-Mediated Liebeskind–Srogl Coupling with Arylboronic Acids
作者:William D. Lambert、Yinzhi Fang、Subham Mahapatra、Zhen Huang、Christopher W. am Ende、Joseph M. Fox
DOI:10.1021/jacs.9b08677
日期:2019.10.30
typically re-lies on linkers that can negatively impact the physiochemical properties of conjugates. Cross-coupling with arylboronic acids and a new reagent, 3-((p-biphenyl-4-ylmethyl)thio)-6-methyltetrazine (b-Tz), proceeds under mild, PdCl2(dppf)-catalyzed conditions to introduce minimal, linker-free te-trazine functionality. Safety considerations guided our design of b-Tz which can be prepared on decagram
Halogen–lithium exchange versus deprotonation: regioselective mono- and dilithiation of aryl benzyl sulfides. A simple approach to α,2-dilithiotoluene equivalents
reactions between aryl benzyl sulfides and alkyllithiums were investigated. The resultant mono- and dilithiated intermediates were converted into the corresponding aldehydes and boronic, or carboxylic acids in good yields. It was found that diethyl ether stabilizes the ortho-lithiated compounds toward isomerisation to the benzylic derivatives. The process occurs easily in THF at low temperature and is
Superactivation of the Botulinum Neurotoxin Serotype A Light Chain Metalloprotease: A New Wrinkle in Botulinum Neurotoxin
作者:Laura A. McAllister、Mark S. Hixon、Jack P. Kennedy、Tobin J. Dickerson、Kim D. Janda
DOI:10.1021/ja057699z
日期:2006.4.5
Small molecules based upon a 2-acylguanidine-5-phenyl thiophene scaffold that can activate the light chain metalloprotease of botulinum neurotoxin serotype A (BoNT LC/A) by an apparent reduction in Km are reported. On the basis of structure-activity relationships and the activation profile, one or more molecules of activator specifically bind to a defined site on the toxin, causing the observed rate enhancement. With the ever-growing clinical uses of BoNT, compounds such as those reported here may provide a method for combating the emerging adaptive immune responses to BoNT.