期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 65, 期 -, 页码 115-120出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2014.01.004
关键词
Black widow spider; Egg; Toxin; Protein; Isolation; Characterization
资金
- National Natural Science Foundation of China [31070700, 31271135]
- National Basic Research Program or 973 Program of China [2010CB529800]
- cooperative Innovation Center of Engineering and New Products for Developmental Biology of Hunan Province
The eggs of black widow spider (L. tredecimguttatus) have been demonstrated to be rich in biologically active components that exhibit great research value and application foreground. In the present study, a protein toxin, named Latroeggtoxin-II, was isolated from the eggs using the combination of gel filtration, ion exchange chromatography and reversed-phase high performance liquid chromatography. Electraspray mass spectrometric analysis indicated that the molecular weight of the protein was 28.69 kDa, and Edman degradation revealed that its N-terminal sequence was ESIQT STYVP NTPNQKFDYEVGKDY-. After being abdominally injected into mice and P. americana, the protein could make the animals especially P. americana display a series of poisoning symptoms. Electrophysiological experiments demonstrated that the protein could selectively inhibit tetrodotoxin-resistant Na+ channel currents in rat dorsal root ganglion neurons, without significant effect on the tetrodotoxin-sensitive Na+ channel currents. Using multiple proteomic strategies, the purified protein was shown to have only a few similarities to the existing proteins in the databases, suggesting that it was a novel protein isolated from the eggs of black widow spiders. (C) 2014 Published by Elsevier B.V.
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