Structure-function analyses of tyrosine phosphatase PTP69D in giant fiber synapse formation of Drosophila.

Structure-function analyses of tyrosine phosphatase PTP69D in giant fiber synapse formation of Drosophila.
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DOI:
10.1016/j.mcn.2014.11.002
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发表时间:
2015-01
期刊:
Molecular and cellular neurosciences
影响因子:
--
通讯作者:
Godenschwege TA
Godenschwege TA
中科院分区:
其他
文献类型:
--
作者:
Lee LH;Godenschwege TA

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PTP 69 D是一种受体蛋白酪氨酸磷酸酶(RPTP),具有两个细胞内催化结构域(Cat 1和Cat 2),并已被证明在胚胎运动神经元的轴突导向以及果蝇视觉系统中感光神经元的靶向中发挥作用。在这里,我们的特点是在巨大的纤维(GF)神经元,在中枢神经系统(CNS)的两个中间神经元,控制苍蝇的逃避反应的发育作用的PTP 69 D。我们的研究表明,PTP 69 D在中枢神经系统突触终末生长中具有功能。我们发现,错义突变的第一个免疫球蛋白(IG)域和Cat 1域,目前在Ptp 69 D10和Ptp 69 D20突变体,分别不影响轴突的指导或靶向,但导致生长迟缓的终端生长的GF。细胞自主拯救实验证明了Cat 1和PTP 69 D的第一个IG结构域在GFs中的功能,但在其突触后靶神经元中不起作用。此外,互补研究和结构-功能分析表明,对于GF末端生长Cat 1功能的PTP 69 D需要的免疫球蛋白和Cat 2域,但不是纤连蛋白III或膜近端区域域。与此相反,纤连蛋白III,但不是免疫球蛋白结构域先前被证明是必不可少的轴突靶向感光神经元。因此,我们的研究揭示了PTP 69 D在CNS突触末端生长中的新作用,其机制与其在光感受器靶向中的功能不同。
PTP69D is a receptor protein tyrosine phosphatase (RPTP) with two intracellular catalytic domains (Cat1 and Cat2) and has been shown to play a role in axon guidance of embryonic motoneurons as well as targeting of photoreceptor neurons in the visual system of Drosophila melanogaster. Here, we characterized the developmental role of PTP69D in the giant fiber (GF) neurons, two interneurons in the central nervous system (CNS) that control the escape response of the fly. Our studies revealed that PTP69D has a function in synaptic terminal growth in the CNS. We found that missense mutations in the first immunoglobulin (Ig) domain and in the Cat1 domain, present inPtp69D10 and Ptp69D20 mutants, respectively, did not affect axon guidance or targeting but resulted in stunted terminal growth of the GFs. Cell autonomous rescue experiments demonstrated a function for the Cat1 and the first Ig domain of PTP69D in the GFs but not in its postsynaptic target neurons. In addition, complementation studies and structure-function analyses revealed that for GF terminal growth Cat1 function of PTP69D requires the immunoglobulin and the Cat2 domains, but not the fibronectin III or the membrane proximal region domains. In contrast, the fibronectin III but not the immunoglobulin domains were previously shown to be essential for axon targeting of photoreceptor neurons. Thus, our studies uncover a novel role for PTP69D in synaptic terminal growth in the CNS that is mechanistically distinct from its function in photoreceptor targeting.
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