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Design and synthesis of labeled analogs of PhTX-56, a potent and selective AMPA receptor antagonist.

Abstract：

:Polyamines and polyamine toxins are biologically important molecules, having modulatory effects on nucleotides and proteins. The wasp toxin, philanthotoxin-433 (PhTX-433), is a non-selective and uncompetitive antagonist of ionotropic receptors, such as ionotropic glutamate receptors and nicotinic acetylcholine receptors. Polyamine toxins are used for the characterization of subtypes of ionotropic glutamate receptors, the Ca2+-permeable AMPA and kainate receptors. A derivative of the native polyamine toxin, philanthotoxin-56 (PhTX-56), has recently been shown to be an exceptionally potent and selective antagonist of Ca2+-permeable AMPA receptors. PhTX-56 and its labeled derivatives are promising tools for structure-function studies of the ion channel of the AMPA receptor. We now describe the design and synthesis of 3H-, 13C-, and 15N-labeled derivatives of PhTX-56 for molecular level studies of AMPA receptors. [3H]PhTX-56 was prepared from a diiodo-precursor with high specific radioactivity, providing the first radiolabeled ligand binding to the pore-forming part of AMPA receptors. For advanced biological NMR studies, 13C and 15N-labeled PhTX-56 were synthesized using solid-phase synthesis. These analogs can provide detailed information on the ligand-receptor interaction. In conclusion, synthesis of labeled derivatives of PhTX-56 provides important tools for future studies of the pore-forming region of AMPA receptors.

journal_name

Bioorg Med Chem

journal_title

Bioorganic & medicinal chemistry

authors

Andersen TF,Vogensen SB,Jensen LS,Knapp KM,Strømgaard K

doi

10.1016/j.bmc.2005.05.023

subject

Has Abstract

pub_date

2005-09-01 00:00:00

pages

5104-12

issue

17

eissn

0968-0896

issn

1464-3391

pii

S0968-0896(05)00458-X

journal_volume

13

pub_type

杂志文章

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