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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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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° 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:两孔结构域(K2P)通道是两个对称的K〜(+)通道,通过响应物理化学刺激使钾离子从细胞中泄漏出来,从而控制细胞的兴奋性。 K2P通道的结晶揭示了几种结构特征的存在,其中包括一个外部盖。在可用的晶体学结构中,帽以非结构域交换(NDS)和结构域交换(DS)链构象形式存在,其中DS链构象围绕通道以180°交换两个相对的外部螺旋。在这项工作中,针对TRAAK(在两个构象中均已结晶的K2P通道),评估了NDS和DS构象中位于帽最高点的残基之间的能量差。结果表明偏好DS构象,但该结果不能扩展到TASK K2P通道。

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