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DOI | 10.3390/toxins8030058 |
Isolation and Pharmacological Characterization of alpha-Elapitoxin-Ot1a, a Short-Chain Postsynaptic Neurotoxin from the Venom of the Western Desert Taipan, Oxyuranus temporalis | |
Barber, Carmel M.1; Rusmili, Muhamad Rusdi Ahmad1,2; Hodgson, Wayne C.1 | |
通讯作者 | Hodgson, Wayne C. |
来源期刊 | TOXINS
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ISSN | 2072-6651 |
出版年 | 2016 |
卷号 | 8期号:3 |
英文摘要 | Taipans (Oxyuranus spp.) are elapids with highly potent venoms containing presynaptic (beta) and postsynaptic (alpha) neurotoxins. O. temporalis (Western Desert taipan), a newly discovered member of this genus, has been shown to possess venom which displays marked in vitro neurotoxicity. No components have been isolated from this venom. We describe the characterization of alpha-elapitoxin-Ot1a (alpha-EPTX-Ot1a; 6712 Da), a short-chain postsynaptic neurotoxin, which accounts for approximately 30% of O. temporalis venom. alpha-Elapitoxin-Ot1a (0.1-1 mu M) produced concentration-dependent inhibition of indirect-twitches, and abolished contractile responses to exogenous acetylcholine and carbachol, in the chick biventer cervicis nerve-muscle preparation. The inhibition of indirect twitches by alpha-elapitoxin-Ot1a (1 mu M) was not reversed by washing the tissue. Prior addition of taipan antivenom (10 U/mL) delayed the neurotoxic effects of alpha-elapitoxin-Ot1a (1 mu M) and markedly attenuated the neurotoxic effects of alpha-elapitoxin-Ot1a (0.1 mu M). alpha-Elapitoxin-Ot1a displayed pseudo-irreversible antagonism of concentration-response curves to carbachol with a pA(2) value of 8.02 +/- 0.05. De novo sequencing revealed the main sequence of the short-chain postsynaptic neurotoxin (i.e., alpha-elapitoxin-Ot1a) as well as three other isoforms found in O. temporalis venom. alpha-Elapitoxin-Ot1a shows high sequence similarity (i.e., >87%) with other taipan short-chain postsynaptic neurotoxins. |
英文关键词 | antivenom postsynaptic neurotoxin Oxyuranus temporalis snake alpha-Elapitoxin-Ot1a |
类型 | Article |
语种 | 英语 |
国家 | Australia ; Malaysia |
收录类别 | SCI-E |
WOS记录号 | WOS:000373599800009 |
WOS关键词 | ACETYLCHOLINE-RECEPTORS ; PRESYNAPTIC NEUROTOXIN ; NEUROMUSCULAR ACTIVITY ; ALPHA-BUNGAROTOXIN ; S-SCUTELLATUS ; SNAKE ; ACTIVATOR ; AFFINITY ; SUBUNIT ; BINDING |
WOS类目 | Food Science & Technology ; Toxicology |
WOS研究方向 | Food Science & Technology ; Toxicology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/196685 |
作者单位 | 1.Monash Univ, Dept Pharmacol, Monash Venom Grp, Clayton, Vic 3168, Australia; 2.Int Islamic Univ Malaysia, Dept Basic Med Sci, Kulliyyah Pharm, Bandar Indera Mahkota 23800, Malaysia |
推荐引用方式 GB/T 7714 | Barber, Carmel M.,Rusmili, Muhamad Rusdi Ahmad,Hodgson, Wayne C.. Isolation and Pharmacological Characterization of alpha-Elapitoxin-Ot1a, a Short-Chain Postsynaptic Neurotoxin from the Venom of the Western Desert Taipan, Oxyuranus temporalis[J],2016,8(3). |
APA | Barber, Carmel M.,Rusmili, Muhamad Rusdi Ahmad,&Hodgson, Wayne C..(2016).Isolation and Pharmacological Characterization of alpha-Elapitoxin-Ot1a, a Short-Chain Postsynaptic Neurotoxin from the Venom of the Western Desert Taipan, Oxyuranus temporalis.TOXINS,8(3). |
MLA | Barber, Carmel M.,et al."Isolation and Pharmacological Characterization of alpha-Elapitoxin-Ot1a, a Short-Chain Postsynaptic Neurotoxin from the Venom of the Western Desert Taipan, Oxyuranus temporalis".TOXINS 8.3(2016). |
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