Zinc ion enhances the blocking potency of synthetic analogs of spider toxin (JSTX) on the glutamate receptor.

Abstract:

:The effect of synthetic spider toxin analogs containing aza-crown in combination with zinc and copper was studied on the lobster neuromuscular synapse. The suppressive action of N4-type spider toxin analog (N4) on excitatory postsynaptic potentials (EPSPs) was markedly enhanced in the presence of 10(-5)-10(-4) M Zn2+. Cu2+ (10(-4) M) also had a potentiating effect on the suppression of EPSPs by N4 but to a lesser degree than Zn2+. While N6-type spider toxin analog (N6) suppressed EPSPs more effectively than N4, additional suppression was not pronounced in the presence of Zn2+ or Cu2+. The results suggest that chelatable divalent metal ions play an important role in the blocking mechanism of glutamate receptor by the spider toxin.

journal_name

Neurosci Res

journal_title

Neuroscience research

authors

Kawai N,Miwa A,Hashimoto Y,Shudo K,Asami T,Nakajima T

doi

10.1016/0168-0102(89)90028-x

subject

Has Abstract

pub_date

1989-04-01 00:00:00

pages

358-62

issue

4

eissn

0168-0102

issn

1872-8111

pii

0168-0102(89)90028-X

journal_volume

6

pub_type

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