Analyses of metal ions in spider venoms in relation to insecticidal activity of clavamine.

Abstract:

:To elucidate insecticidal activity of spider toxins, metal ions in venoms and in the bodies were determined by thin layer chromatography, spark source mass spectrometry, ion chromatography, inductively coupled plasma emission spectrometry and atomic absorption spectrometry. Two kinds of spiders were used, Nephila clavata and Nephila maculata. Metals from their venom glands were extracted with hydrochloric acid and the metal concentrations were almost the same in the two species. Many kinds of metals, Fe, Zn, Pb, Cu, Ca, Mg, Na, P and S were found at higher levels in the venoms at concentrations higher than in the bodies. The contents of metal ions were low in the dragonfly and the cicada which are considered to be preys. Clavamine, the main insecticidal component in N. clavata, was effective on larvae of a mosquito with Ca2+, Fe3+ or Pb2+, but ineffective with Mg2+, Zn2+, Fe2+ or Cu2+. It is suggested that the metal chelates play an important role in the intoxication and detoxication of the spider toxins.

journal_name

Biol Pharm Bull

authors

Yoshioka M,Narai N,Shinkai A,Tokuda T,Saito K,Shioya M,Tokoro N,Kono Y

doi

10.1248/bpb.17.472

subject

Has Abstract

pub_date

1994-04-01 00:00:00

pages

472-5

issue

4

eissn

0918-6158

issn

1347-5215

journal_volume

17

pub_type

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