Functional Validation of Heteromeric Kainate Receptor Models.
Functional Validation of Heteromeric Kainate Receptor Models.
复制标题
异聚红藻氨酸受体模型的功能验证。
DOI:
10.1016/j.bpj.2017.08.047
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发表时间:
2017
影响因子:
3.4
通讯作者:
Paramo T
中科院分区:
文献类型:
--
作者:
Paramo T
Kainate receptors require the presence of external ions for gating. Most work thus far has been performed on homomeric GluK2 but, in vivo, kainate receptors are likely heterotetramers. Agonists bind to the ligand-binding domain (LBD) which is arranged as a dimer of dimers as exemplified in homomeric structures, but no high-resolution structure currently exists of heteromeric kainate receptors. In a full-length heterotetramer, the LBDs could potentially be arranged either as a GluK2 homomer alongside a GluK5 homomer or as two GluK2/K5 heterodimers. We have constructed models of the LBD dimers based on the GluK2 LBD crystal structures and investigated their stability with molecular dynamics simulations. We have then used the models to make predictions about the functional behavior of the full-length GluK2/K5 receptor, which we confirmed via electrophysiological recordings. A key prediction and observation is that lithium ions bind to the dimer interface of GluK2/K5 heteromers and slow their desensitization.
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