The linker pivot in Ci-VSP: the key to unlock catalysis.

The linker pivot in Ci-VSP: the key to unlock catalysis.
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DOI:
10.1371/journal.pone.0070272
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Friedrich T
Friedrich T
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Hobiger K;Utesch T;Mroginski MA;Seebohm G;Friedrich T

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在电压敏感性磷酸酶Ci-VSP中,跨膜电压传感器结构域(VSD)中的构象变化被转导至细胞内催化结构域(CD),导致其对膜嵌入的磷酸肌醇的去磷酸化活性。这两个结构域之间的接头被认为是至关重要的VSD-CD耦合。与非洲爪蟾卵母细胞的电生理测量和分子动力学模拟嵌入在脂质双层的Ci-VSP模型的组合方法,我们分析了如何在连接器介导的CD和激活VSD之间的相互作用的构象变化。通过这种方式,我们确定了接头中的特定残基,这些残基与形成蛋白质活性位点的三个环之一(称为TI环)中定义明确的氨基酸相互作用。通过我们的研究结果,我们揭示了VSD和CD之间偶联过程的早期步骤,该过程基于连接体、膜和CD之间的微调静电和疏水相互作用。
In the voltage-sensitive phosphatase Ci-VSP, conformational changes in the transmembrane voltage sensor domain (VSD) are transduced to the intracellular catalytic domain (CD) leading to its dephosphorylation activity against membrane-embedded phosphoinositides. The linker between both domains is proposed to be crucial for the VSD-CD coupling. With a combined approach of electrophysiological measurements on Xenopus oocytes and molecular dynamics simulations of a Ci-VSP model embedded in a lipid bilayer, we analyzed how conformational changes in the linker mediate the interaction between the CD and the activated VSD. In this way, we identified specific residues in the linker that interact with well-defined amino acids in one of the three loops forming the active site of the protein, named TI loop. With our results, we shed light into the early steps of the coupling process between the VSD and the CD, which are based on fine-tuned electrostatic and hydrophobic interactions between the linker, the membrane and the CD.
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