Presynaptic CK2 promotes synapse organization and stability by targeting Ankyrin2.

Presynaptic CK2 promotes synapse organization and stability by targeting Ankyrin2.
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突触前CK2通过靶向Ankyrin2促进突触组织和稳定性。

DOI:
10.1083/jcb.201305134
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发表时间:
2014-01-06
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Pielage J
Pielage J
中科院分区:
其他
文献类型:
--
作者:
Bulat V;Rast M;Pielage J

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酪蛋白激酶2磷酸化突触细胞骨架成分促进突触连接的发展和维持。突触维持的精确调控对神经元回路的发育和功能至关重要。利用针对果蝇kinome和phosphatome的体内RNAi筛选,我们确定了11种通过调节细胞骨架、磷脂或代谢信号来控制突触稳定性的激酶和磷酸酶。我们关注酪蛋白激酶2 (CK2),并证明CK2的调控(β)和催化(α)亚基对突触维持至关重要。CK2α激酶活性是突触前运动神经元必需的,其与CK2β的相互作用是由CK2α的两个n端残基协同介导的,这对于CK2全酶复合物的稳定性和体内功能至关重要。利用遗传和生化方法,我们确定Ankyrin2是CK2维持突触稳定性的关键突触前靶点。此外,CK2活性控制着突触前神经末梢内单个突触释放位点的亚细胞组织。我们的研究发现突触结构成分的磷酸化是一种积极控制突触连接发育和寿命的令人信服的机制。
Phosphorylation of synaptic cytoskeletal components by casein kinase 2 promotes the development and maintenance of synaptic connections. The precise regulation of synapse maintenance is critical to the development and function of neuronal circuits. Using an in vivo RNAi screen targeting the Drosophila kinome and phosphatome, we identify 11 kinases and phosphatases controlling synapse stability by regulating cytoskeletal, phospholipid, or metabolic signaling. We focus on casein kinase 2 (CK2) and demonstrate that the regulatory (β) and catalytic (α) subunits of CK2 are essential for synapse maintenance. CK2α kinase activity is required in the presynaptic motoneuron, and its interaction with CK2β, mediated cooperatively by two N-terminal residues of CK2α, is essential for CK2 holoenzyme complex stability and function in vivo. Using genetic and biochemical approaches we identify Ankyrin2 as a key presynaptic target of CK2 to maintain synapse stability. In addition, CK2 activity controls the subcellular organization of individual synaptic release sites within the presynaptic nerve terminal. Our study identifies phosphorylation of structural synaptic components as a compelling mechanism to actively control the development and longevity of synaptic connections.
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