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LRRC26 auxiliary protein allows BK channel activation at resting voltage without calcium

机译:LRRC26辅助蛋白可在静止电压下激活BK通道而无钙

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摘要

Large-conductance, voltage- and calcium-activated potassium (BK, or K_(Ca)1.1) channels are ubiquitously expressed in electrically excitable and non-excitable cells, either as α-subunit (BKa) tetramers or together with tissue specific auxiliary β-subunits (β1-β4). Activation of BK channels typically requires coincident membrane depolarization and elevation in free cytosolic Ca~(2+) concentration ([Ca~(2+)]i), which are not physiological conditions for most non-excitable cells. Here we present evidence that in non-excitable LNCaP prostate cancer cells, BK channels can be activated at negative voltages without rises in [Ca~(2+)]i through their complex with an auxiliary protein, leucine-rich repeat (LRR)-containing protein 26 (LRRC26). LRRC26 modulates the gating of a BK channel by enhancing the allosteric coupling between voltage-sensor activation and the channel's closed-open transition. This finding reveals a novel auxiliary protein of a voltage-gated ion channel that gives an unprecedentedly large negative shift (~-140 mV) in voltage dependence and provides a molecular basis for activation of BK channels at physiological voltages and calcium levels in non-excitable cells.
机译:大电导,电压和钙激活的钾(BK或K_(Ca)1.1)通道以α亚基(BKa)四聚体或与组织特异性辅助β一起普遍存在于电可兴奋和不可兴奋的细胞中-亚基(β1-β4)。 BK通道的激活通常需要同时发生膜去极化和游离胞质Ca〜(2+)浓度([Ca〜(2 +)] i)升高,这对于大多数非兴奋性细胞而言并不是生理条件。在这里,我们提供证据表明,在非兴奋性LNCaP前列腺癌细胞中,BK通道可以在负电压下激活,而不会通过[Ca〜(2 +)] i与辅助蛋白,富含亮氨酸的重复序列(LRR)-含有蛋白质26(LRRC26)。 LRRC26通过增强电压传感器激活与通道的开闭过渡之间的变构耦合来调节BK通道的门控。这一发现揭示了一种电压门控离子通道的新型辅助蛋白,该蛋白在电压依赖性方面提供了前所未有的大负移(〜-140 mV),并为生理电压和非兴奋性钙水平下的BK通道活化提供了分子基础。细胞。

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  • 来源
    《Nature》 |2010年第7305期|P.513-516|共4页
  • 作者单位

    Section of Neurobiology, Center for Learning and Memory, University of Texas, Austin, Texas 78712, USA;

    rnSection of Neurobiology, Center for Learning and Memory, University of Texas, Austin, Texas 78712, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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