Mutations of tyrosine 467 in the human norepinephrine transporter attenuate HIV-1 Tat-induced inhibition of dopamine transport while retaining physiological function.

Mutations of tyrosine 467 in the human norepinephrine transporter attenuate HIV-1 Tat-induced inhibition of dopamine transport while retaining physiological function.
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DOI:
10.1371/journal.pone.0275182
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发表时间:
2022
期刊:
影响因子:
3.7
通讯作者:
Zhu, Jun
Zhu, Jun
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Strauss, Matthew J.;Porter, Katherine D.;Quizon, Pamela M.;Davis, Sarah E.;Lin, Steven;Yuan, Yaxia;Martinez-Muniz, Gustavo A.;Sun, Wei-Lun;Zhan, Chang-Guo;Zhu, Jun

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HIV-1 转录反式激活因子 (Tat) 引起的多巴胺能传递失调被认为是 HIV-1 相关神经认知障碍 (HAND) 发展的核心因素。我们已经证明,人多巴胺转运蛋白 (hDAT) 的酪氨酸 470 残基在 Tat-hDAT 相互作用中发挥着关键作用。基于计算模型预测,本研究试图检查人去甲肾上腺素转运蛋白 (hNET) 酪氨酸 467 残基(hDAT 酪氨酸 470 的相应残基)的突变效应,对 Tat 诱导的 hNET 重摄取多巴胺抑制的影响。 hNET 酪氨酸 467 突变为组氨酸 (Y467H) 或苯丙氨酸 (Y467F) 在表达野生型 hNET 及其突变体的 PC12 细胞中表现出相似的 [3H] 多巴胺和 [3H] 去甲肾上腺素再摄取动力学特性。与野生型hNET相比,Y467H或Y467F均未改变[3H]WIN35,428结合的Bmax和Kd值,而Y467H但不Y467F降低[3H]尼索西汀结合的Bmax而不改变Kd。相对于野生型 hNET,Y467H 还增加了尼索西汀抑制 [3H] 多巴胺摄取的亲和力。重组 Tat1-86 (140 nM) 诱导野生型 hNET 中 [3H] 多巴胺的摄取显着减少,并且在 Y467H 和 Y467F 中均减弱。与野生型hNET相比,Y467H或Y467F均未改变表达WT hNET和突变体的CHO细胞中的[3H]多巴胺流出量,而Y467F但不Y467H减少[3H]MPP+流出量。这些结果证明酪氨酸467是hNET中的功能识别残基,可抑制Tat诱导的多巴胺转运,并为开发在HAND背景下靶向Tat-NET相互作用的选择性化合物的分子基础提供了新的见解。
Dysregulation of dopaminergic transmission induced by the HIV-1 transactivator of transcription (Tat) has been implicated as a central factor in the development of HIV-1 associated neurocognitive disorders (HAND). We have demonstrated that the tyrosine470 residue of the human dopamine transporter (hDAT) plays a critical role in Tat-hDAT interaction. Based on the computational modeling predictions, the present study sought to examine the mutational effects of the tyrosine467 residue of the human norepinephrine transporter (hNET), a corresponding residue of the hDAT tyrosine470, on Tat-induced inhibition of reuptake of dopamine through the hNET. Mutations of the hNET tyrosine467 to a histidine (Y467H) or a phenylalanine (Y467F) displayed similar kinetic properties of reuptake of [3H]dopamine and [3H]norepinephrine in PC12 cells expressing wild-type hNET and its mutants. Compared to wild-type hNET, neither of Y467H or Y467F altered Bmax and Kd values of [3H]WIN35,428 binding, whereas Y467H but not Y467F decreased the Bmax of [3H]nisoxetine binding without changes in Kd. Y467H also increased the affinity of nisoxetine for inhibiting [3H]dopamine uptake relative to wild-type hNET. Recombinant Tat1-86 (140 nM) induced a significant reduction of [3H]dopamine uptake in wild-type hNET, which was attenuated in both Y467H and Y467F. Compared to wild-type hNET, neither Y467H or Y467F altered [3H]dopamine efflux in CHO cells expressing WT hNET and mutants, whereas Y467F but not Y467H decreased [3H]MPP+ efflux. These results demonstrate tyrosine467 as a functional recognition residue in the hNET for Tat-induced inhibition of dopamine transport and provide a novel insight into the molecular basis for developing selective compounds that target Tat-NET interactions in the context of HAND.
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发表时间: 2019-03-26
影响因子: 3.4
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[‘H] CFT与去甲肾上腺素转运蛋白结合的表征表明,CFT和Nisoxetine的结合不是互斥的。
DOI: 10.1016/j.jneumeth.2011.08.044
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