Characterization of ether-à-go-go channels present in photoreceptors reveals similarity to IKx, a K+ current in rod inner segments.

Characterization of ether-à-go-go channels present in photoreceptors reveals similarity to IKx, a K+ current in rod inner segments.
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具有光感受器中存在的以太触发通道的表征显示出与杆内段中的K+电流IKX相似性。

DOI:
10.1085/jgp.111.4.583
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发表时间:
1998-04
影响因子:
3.8
通讯作者:
Baumann, A
Baumann, A
中科院分区:
医学2区
文献类型:
--
作者:
Frings, S;Brüll, N;Dzeja, C;Angele, A;Hagen, V;Kaupp, UB;Baumann, A

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在这项研究中,我们描述了从牛视网膜克隆的乙醚-à-go-go(EAG)K+通道的两个剪接变体:bEAG 1和bEAG 2。bEAG 2多肽在跨膜区段S3和S4之间的细胞外接头中含有27个氨基酸的额外插入。异源表达的剪接变体在其活化动力学上不同,并且通过细胞外Mg 2+进行不同的调节。通过Mg 2+的调制的协同性表明,推定的四聚体通道的每个亚基结合Mg 2+离子。该通道既不渗透Ca 2+离子,也不受环核苷酸的调节。原位杂交定位通道转录光感受器和视网膜神经节细胞。比较EAG电流与IKx,非失活K+电流的内部段杆光感受器,揭示了一个有趣的相似性,这表明EAG多肽参与Kx通道的形成。
In this study, we describe two splice variants of an ether-à-go-go (EAG) K+ channel cloned from bovine retina: bEAG1 and bEAG2. The bEAG2 polypeptide contains an additional insertion of 27 amino acids in the extracellular linker between transmembrane segments S3 and S4. The heterologously expressed splice variants differ in their activation kinetics and are differently modulated by extracellular Mg2+. Cooperativity of modulation by Mg2+ suggests that each subunit of the putative tetrameric channel binds a Mg2+ ion. The channels are neither permeable to Ca2+ ions nor modulated by cyclic nucleotides. In situ hybridization localizes channel transcripts to photoreceptors and retinal ganglion cells. Comparison of EAG currents with IKx, a noninactivating K+ current in the inner segment of rod photoreceptors, reveals an intriguing similarity, suggesting that EAG polypeptides are involved in the formation of Kx channels.
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