PKA-mediated phosphorylation of Neuroligin-2 regulates its cell surface expression and synaptic stabilisation

PKA-mediated phosphorylation of Neuroligin-2 regulates its cell surface expression and synaptic stabilisation
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PKA 介导的 Neuroligin-2 磷酸化调节其细胞表面表达和突触稳定

DOI:
10.1101/2020.07.23.218008
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发表时间:
2020
期刊:
--
影响因子:
--
通讯作者:
Halff E
Halff E
中科院分区:
--
文献类型:
--
作者:
Halff E

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跨突触粘附分子 Neuroligin-2 (NL2) 对于抑制性突触的发育和功能至关重要。 NL2 招募突触后支架蛋白 gephyrin,从而稳定突触后结构域中的 GABAA 受体 (GABAAR)。突触 GABAAR 浓度的动态调节对于抑制性神经传递功效至关重要。 NL2 突触水平的变化有助于调节 GABAAR 突触浓度,但控制 NL2 突触稳定的机制大多未知。在这里,通过结合生物化学、成像、单粒子追踪和电生理学,我们确定了 cAMP 依赖性蛋白激酶 (PKA) 在 NL2 突触稳定中的关键作用。我们发现 PKA 介导的 NL2 在 S714 处的磷酸化导致其从突触分散并降低 NL2 表面水平,导致突触 GABAAR 的损失。相反,通过消除磷酸化增强 NL2 在突触处的稳定性会导致抑制信号传导增加。因此,PKA 在调节 NL2 功能和突触抑制中起着关键作用。
The trans-synaptic adhesion molecule Neuroligin-2 (NL2) is essential for the development and function of inhibitory synapses. NL2 recruits the postsynaptic scaffold protein gephyrin, which in turn stabilises GABAAreceptors (GABAARs) in the postsynaptic domain. Dynamic regulation of synaptic GABAAR concentration is crucial for inhibitory neurotransmission efficacy. Changes in synaptic levels of NL2 contribute to regulating GABAAR synaptic concentration, however the mechanisms that control NL2 synaptic stabilisation are mostly unknown. Here, by combining biochemistry, imaging, single particle tracking and electrophysiology, we identify a key role for cAMP-dependent protein kinase (PKA) in synaptic stabilisation of NL2. We show that PKA-mediated phosphorylation of NL2 at S714 causes its dispersal from the synapse and reduces NL2 surface levels, leading to a loss of synaptic GABAARs. Conversely, enhanced stability of NL2 at synapses through abolishing phosphorylation leads to increased inhibitory signalling. Thus, PKA plays a key role in regulating NL2 function and synaptic inhibition.
DOI: 10.1042/bst0371355
发表时间: 2009-12
影响因子: 3.9
作者:
Vithlani M;Moss SJ
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DOI: 10.1073/pnas.0506653102
发表时间: 2005-10-11
影响因子: 11.1
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Kittler, JT;Chen, GJ;Moss, SJ
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发表时间: 2006
期刊: --
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DOI: 10.1073/pnas.80.10.2926
发表时间: 1983-01-01
期刊: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA-BIOLOGICAL SCIENCES
影响因子: --
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DAVIS, FM;TSAO, TY;RAO, PN
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