Expression cloning of KCRF, a potassium channel regulatory factor.

Expression cloning of KCRF, a potassium channel regulatory factor.
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钾通道调节因子 KCRF 的表达克隆。

DOI:
10.1006/bbrc.2000.3240
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发表时间:
2000
期刊:
Biochemical and biophysical research communications.
影响因子:
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通讯作者:
Dascal,N
Dascal,N
中科院分区:
--
文献类型:
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作者:
Keren-Raifman,T;Ivanina,T;Bismuth,Y;Dascal,N

文献摘要

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通过对非洲爪蟾卵母细胞中的大鼠 cDNA 文库进行功能共表达筛选,我们克隆了一种蛋白(KCRF:K 通道调节因子),该蛋白可降低多个 K+ 通道的电流:G 蛋白激活的 GIRK1/4 (Kir3.1/Kir3.4)、内向整流器 IRK1 (Kir2.1) 和电压依赖性 KV1.1/KVβ1.1。 KCRF 不调制另外两个 K+ 通道:ROMK1 (Kir1.1) 和 GIRK1/2 (Kir3.1/Kir3.2) 以及电压依赖性 L 型 Ca2+ 通道。 Western blot分析表明KCRF在大鼠组织中普遍存在。生化和电生理学实验表明,KCRF 的共表达导致卵母细胞中 IRK1 和 KV1.1/KVβ1.1 蛋白表达水平降低。
By functional coexpression screening of a rat cDNA library in Xenopus oocytes, we have cloned a protein (KCRF: K Channel Regulatory Factor) that reduces currents of several K+channels: G protein-activated GIRK1/4 (Kir3.1/Kir3.4), inward rectifier IRK1 (Kir2.1), and voltage-dependent KV1.1/KVβ1.1. KCRF did not modulate two other K+channels: ROMK1 (Kir1.1) and GIRK1/2 (Kir3.1/Kir3.2) and the voltage-dependent L-type Ca2+channels. Western blot analysis showed that KCRF is ubiquitous in rat tissues. Biochemical and electrophysiological experiments revealed that coexpression of KCRF causes a decrease in the level of expression of IRK1 and KV1.1/KVβ1.1 proteins in the oocytes.