Design and Synthesis of Photoaffinity-Labeling Ligands of the l-Prolyl-l-leucylglycinamide Binding Site Involved in the Allosteric Modulation of the Dopamine Receptor
摘要:
Pro-Leu-Gly-NH2 (PLG), in addition to its endocrine effects, possesses the ability to modulate dopamine D-2 receptors within the central nervous system. However, the precise binding site of PLG is unknown. Potential photoaffinity-labeling ligands of the PLG binding site were designed as tools to be used in the identification of the macromolecule that possesses this binding site. Six different photoaffinity-labeling ligands were designed and synthesized on the basis of the gamma-lactam PLG peptidomimetic 1. The 4-azidobenzoyl and 4-azido-2-hydroxybenzoyl photoaffinity-labeling moieties were placed at opposite ends of PLG peptidomimetic I to generate a series of ligands that potentially could be used to map the PLG binding site. All of the compounds that were synthesized possessed activity comparable to or better than PLG in enhancing [H-3]-N-propylnorapomorphine agonist binding to dopamine receptors. Photoaffinity ligands that were crosslinked to the receptor preparation produced a modulatory effect that was either comparable to or greater than the increase in agonist binding produced by the respective ligands that were not cross-linked to the dopamine receptor. The results indicate that these photoaffinity-labeling agents are binding at the same allosteric site as PLG and PLG peptidomimetic 1.
Iodination of phenols using chloramine T and sodium iodide
作者:Tadashi Kometani、David S. Watt、Tae Ji
DOI:10.1016/s0040-4039(00)94774-9
日期:——
A convenient procedure for the iodination of many substitutedphenols uses chloramineT and sodium iodide in DMF, DMSO, or acetonitrile.
许多取代的苯酚加碘的简便方法是在DMF,DMSO或乙腈中使用氯胺T和碘化钠。
An improved procedure for the iodination of phenols using sodium iodide and tert-butyl hypochlorite
作者:Tadashi Kometani、David S. Watt、Tae Ji、Tony Fitz
DOI:10.1021/jo00225a079
日期:1985.12
Avermectin chemistry and action: ester- and ether-type candidate photoaffinity probes
作者:Yoshihisa Tsukamoto、Loretta M. Cole、John E. Casida
DOI:10.1016/s0968-0896(99)00259-x
日期:2000.1
Avermectin B-1a (1) is a potent anthelmintic, insecticide, miticide and chloride channel activator on interaction with a specific nerve membrane site analyzed by binding assays with [H-3]1. Candidate photoaffinity probes were prepared replacing the dioleandrosyl substituent with potential isosteric esters and ethers approximating the original overall atom length and terminating in a phenyl moiety substituted with azido, iodo or hydroxy. Several of the candidates met the goal of high potency on mouse, housefly and fruit fly brain chloride channels with IC50 values of 7-57 nM in competing for the [H-3]1 binding site. (C) 2000 Elsevier Science Ltd. All rights reserved.
KOMETANI, TADASHI;WATT, D. S.;JI, TAE, TETRAHEDRON LETT., 1985, 26, N 17, 2043-2046
作者:KOMETANI, TADASHI、WATT, D. S.、JI, TAE
DOI:——
日期:——
Synthesis and biological activity of iodinated and photosensitive derivatives of tetrabenazine
作者:G Aranda、JP Beaucourt、M Ponchant、MF Isambert、JP Henry