The binding constants (K(i) values) of 24 caracurineV and 6 iso-caracurineV analogues for the muscle type of nicotinic ACh receptors (nAChR) from Torpedo californica were determined in a binding assay using (+/-)-[(3)H]epibatidine as a radioligand. The allyl alcohol group present in the iso-caracurineVringsystem was found to be essential for high binding affinity. The most potent compounds are
Probing the Pharmacophore for Allosteric Ligands of Muscarinic M<sub>2</sub> Receptors: SAR and QSAR Studies in a Series of Bisquaternary Salts of Caracurine V and Related Ring Systems
作者:Darius P. Zlotos、Stefan Buller、Nikolaus Stiefl、Knut Baumann、Klaus Mohr
DOI:10.1021/jm0311341
日期:2004.7.1
Allosteric effects on muscarinic acetylcholine M(2) receptors were examined in a series of bisquaternary salts of the Strychnos alkaloid caracurineV (6) and related iso-caracurineV, tetrahydrocaracurineV, and bisnortoxiferineringsystems. The compounds inhibited dissociation of the orthosteric antagonist [(3)H]N-methylscopolamine (NMS) from porcine cardiac M(2) receptors with EC(0.5,diss) values
<i>iso</i>-Caracurine V, a Novel Unexpected Decomposition Product of Caracurine V
作者:Darius Paul Zlotos
DOI:10.1021/np020336h
日期:2003.1.1
The structure of iso-caracurineV (3), an unexpected decomposition product of the Strychnos alkaloid caracurineV (1), was determined by NMR spectroscopy. Compound 3, which was probably previously regarded as bisnortoxiferine I (2), is a one-sided ring closed product of 2.