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Energetic differences between non-domain-swapped and domain-swapped chain connectivities in the K2P potassium channel TRAAK

机译:K2P钾通道Traak中非域交换和域交换链连接性之间的能量差异

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摘要

Two-pore domain (K2P) channels are twofold symmetric K+ channels which control cell excitability by enabling the leak of potassium ions from cells in response to physicochemical stimuli. Crystallization of K2P channels revealed the presence of several structural features, which include an external cap. In the available crystallographic structures, the cap is present as non-domain-swapped (NDS) and domain-swapped (DS) chain conformations, where DS chain conformation exchanges two opposing outer helices 180 degrees around the channel. In this work, energy differences between the residues located at the highest point of the cap in NDS and DS conformations were evaluated for TRAAK, a K2P channel that was crystallized in both conformations. Results indicated a preference for DS conformation, but this result is not extensible to TASK K2P channels.
机译:双孔结构域(K2P)通道是双重的对称k +通道,其通过响应于物理化学刺激而使钾离子泄漏来控制细胞兴奋性。 K2P通道的结晶显示出几种结构特征的存在,包括外盖。 在可用的晶形结构中,帽作为非域交换(NDS)和畴(DS)链构象存在,其中DS链构象在沟道周围交换两个相对的外螺旋180度。 在这项工作中,对位于NDS和DS构象的最高点的残留物之间的能量差异被评估为TRAAK,在两个构象中结晶的K2P通道。 结果表示对DS构象的偏好,但此结果不可于任务K2P通道扩展。

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  • 来源
    《RSC Advances》 |2018年第47期|共9页
  • 作者单位

    Univ Talca Ctr Bioinformat Simulac Mol Fac Ingn 2 Norte 685 Casilla 721 Talca Chile;

    Univ Talca Ctr Bioinformat Simulac Mol Fac Ingn 2 Norte 685 Casilla 721 Talca Chile;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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