BmBKTx1, a novel Ca2+-activated K+ channel blocker purified from the Asian scorpion Buthus martensi Karsch
文献类型：期刊论文
| 作者 | Xu, CQ; Brone, B; Wicher, D; Bozkurt, O; Lu, WY; Huys, I; Han, YH; Tytgat, J; Van Kerkhove, E; Chi, CW |
| 刊名 | JOURNAL OF BIOLOGICAL CHEMISTRY
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| 出版日期 | 2004 |
| 卷号 | 279期号:33页码:34562-34569 |
| 通讯作者 | Chi, CW (reprint author), Chinese Acad Sci, Grad Sch,Shanghai Inst Biol Sci, Inst Biochem & Cell Biol, Key Lab Proteom, Shanghai 200031, Peoples R China.,chi@sunm.shcnc.ac.cn |
| 英文摘要 | BmBKTx1 is a novel short chain toxin purified from the venom of the Asian scorpion Buthus martensi Karsch. It is composed of 31 residues and is structurally related to SK toxins. However, when tested on the cloned rat SK2 channel, it only partially inhibited rSK2 currents, even at a concentration of 1 muM. To screen for other possible targets, BmBKTx1 was then tested on isolated metathoracic dorsal unpaired median neurons of Locusta migratoria, in which a wide variety of ion channels are expressed. The results suggested that BmBKTx1 could specifically block voltage-gated Ca2+-activated K+ currents (BK-type). This was confirmed by testing the BmBKTx1 effect on the alpha subunits of BK channels of the cockroach (pSlo), fruit fly (dSlo), and human (hSlo), heterologously expressed in HEK293 cells. The IC50 for channel blocking by BmBKTx1 was 82 nM for pSlo and 194 nM for dSlo. Interestingly, BmBKTx1 hardly affected hSlo currents, even at concentrations as high as 10 muM, suggesting that the toxin might be insect specific. In contrast to most other scorpion BK blockers that also act on the Kv1.3 channel, BmBKTx1 did not affect this channel as well as other Kv channels. These results show that BmBKTx1 is a novel kind of blocker of BK-type Ca2+-activated K+ channels. As the first reported toxin active on the Drosophila Slo channel dSlo, it will also greatly facilitate studying the physiological role of BK channels in this model organism. |
| 学科主题 | Biochemistry & Molecular Biology |
| 类目[WOS] | Biochemistry & Molecular Biology |
| 关键词[WOS] | ACTIVATED POTASSIUM CHANNELS ; MAXI-K ; LOCUSTA-MIGRATORIA ; BINDING-SITES ; LEIUROTOXIN-I ; CHARYBDOTOXIN ; TOXINS ; NEURONS ; PURIFICATION ; IBERIOTOXIN |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000223134800060 |
| 版本 | 出版稿 |
| 源URL | [http://202.127.25.143/handle/331003/2185]  |
| 专题 | 上海生化细胞研究所_上海生科院生化细胞研究所 |
| 推荐引用方式 GB/T 7714 | Xu, CQ,Brone, B,Wicher, D,et al. BmBKTx1, a novel Ca2+-activated K+ channel blocker purified from the Asian scorpion Buthus martensi Karsch[J]. JOURNAL OF BIOLOGICAL CHEMISTRY,2004,279(33):34562-34569. |
| APA | Xu, CQ.,Brone, B.,Wicher, D.,Bozkurt, O.,Lu, WY.,...&Chi, CW.(2004).BmBKTx1, a novel Ca2+-activated K+ channel blocker purified from the Asian scorpion Buthus martensi Karsch.JOURNAL OF BIOLOGICAL CHEMISTRY,279(33),34562-34569. |
| MLA | Xu, CQ,et al."BmBKTx1, a novel Ca2+-activated K+ channel blocker purified from the Asian scorpion Buthus martensi Karsch".JOURNAL OF BIOLOGICAL CHEMISTRY 279.33(2004):34562-34569. |
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