Fyn kinase contributes to tyrosine phosphorylation of the GABA(A) receptor gamma2 subunit.

Fyn kinase contributes to tyrosine phosphorylation of the GABA(A) receptor gamma2 subunit.
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DOI:
10.1016/j.mcn.2010.03.002
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发表时间:
2010-06
影响因子:
3.5
通讯作者:
Moss, Stephen J.
Moss, Stephen J.
中科院分区:
医学3区
文献类型:
--
作者:
Jurd, Rachel;Tretter, Verena;Walker, Joshua;Brandon, Nicholas J.;Moss, Stephen J.

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GABAA受体的磷酸化是哺乳动物脑中动态调节抑制性突触功能的重要机制。特别地,GABAa受体γ2亚基内酪氨酸残基365和367(Y365/7)的磷酸化负调节GABAa受体的内吞作用并增强突触抑制。在这里,我们表明,Fyn,Src家族激酶(SFK),与γ2亚基的磷酸化依赖性的方式相互作用。此外,我们证明Fyn结合在γ2细胞内结构域的区域内,该区域以残基Y365/7为中心,Y367的磷酸化对于介导这种相互作用特别重要。在Fyn基因敲除小鼠的海马中,γ2亚基的酪氨酸磷酸化显著降低,表明Fyn是一种重要的激酶,有助于该亚基在体内的磷酸化。在Fyn激酶小鼠中,γ2亚基的酪氨酸磷酸化没有被完全消除,这表明其他SFK,如Src,也有助于维持和调节含γ2的GABA(A)受体的内源性磷酸化水平。总之,我们证明Fyn是与GABAA受体的γ2亚基结合并磷酸化的SFK之一。这对于通过导致Fyn激酶激活的信号传导通路调节突触GABAA受体具有重要意义。
Phosphorylation of GABAA receptors is an important mechanism for dynamically modulating inhibitory synaptic function in the mammalian brain. In particular, phosphorylation of tyrosine residues 365 and 367 (Y365/7) within the GABAA receptor γ2 subunit negatively regulates the endocytosis of GABAA receptors and enhances synaptic inhibition. Here we show that Fyn, a Src family kinase (SFK), interacts with the γ2 subunit in a phosphorylation-dependent manner. Furthermore, we demonstrate that Fyn binds within a region of the γ2 intracellular domain that is centered on residues Y365/7, with the phosphorylation of Y367 being particularly important for mediating this interaction. Tyrosine phosphorylation of the γ2 subunit is significantly reduced in the hippocampus of Fyn knock-out mice, suggesting that Fyn is an important kinase that contributes to the phosphoryation of this subunit in vivo. Tyrosine phosphorylation of the γ2 subunit is not completely abolished in Fyn kinase mice, suggesting that other SFKs, such as Src, also contribute to maintaining and regulating the endogenous phosphorylation level of γ2-containing GABA(A) receptors. In summary, we demonstrate Fyn as one of the SFKs that binds to and phosphorylates the γ2 subunit of the GABAA receptor. This has important implications for the regulation of synaptic GABAA receptors via signaling pathways that lead to the activation of Fyn kinase.
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