The involvement of oxysterol-binding protein related protein (ORP) 6 in the counter-transport of phosphatidylinositol-4-phosphate (PI4P) and phosphatidylserine (PS) in neurons.

The involvement of oxysterol-binding protein related protein (ORP) 6 in the counter-transport of phosphatidylinositol-4-phosphate (PI4P) and phosphatidylserine (PS) in neurons.
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氧甾醇结合蛋白相关蛋白(ORP) 6参与磷脂酰肌醇-4-磷酸(PI4P)和磷脂酰丝氨酸(PS)在神经元中的反转运。

DOI:
10.1016/j.bbrep.2022.101257
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发表时间:
2022-07
影响因子:
2.7
通讯作者:
Noda, Yasuko
Noda, Yasuko
中科院分区:
其他
文献类型:
--
作者:
Mochizuki, Shinya;Miki, Harukata;Zhou, Ruyun;Noda, Yasuko

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氧甾醇结合蛋白 (OSBP) 相关蛋白 (ORP) 6 是 ORP 家族 III 亚家族的成员,定位于内质网 (ER) 和其他细胞器之间的膜接触位点,并在神经元中的脂质非囊泡交换中发挥作用,包括 4-磷酸磷脂酰肌醇 (PI4P)。在本研究中,我们利用分子细胞生物学技术寻找反转运的脂质以换取 PI4P。反卷积显微镜显示,ORP6 的敲低部分改变了原代培养的小脑神经元中磷脂酰丝氨酸 (PS) 标记的定位,但没有改变菲律宾蛋白的定位。缺乏 OSBP 相关配体结合域 (ORD) 的 ORP6 构建体的过度表达导致 PS 标记的相同变化。 PI4KⅢα抑制剂特异性抑制PI4P的合成和质膜(PM)定位,抑制ORP6和PS标记在PM上的定位。在 Neuro-2A 细胞中,突变型 PS 合酶 1 (PSS1) 的过表达抑制 PS 标记物向 PM 的转运,并将 PI4P 标记物重新定位到 PM。引入 ORP6 但不是显性负 ORP6 构建体,将 PS 的定位转移回 PM。这些数据共同表明 ORP6 参与 PI4P 和 PS 的逆转运。 ORP6 的敲低改变了 PS 标记的定位。 PS 标记和 ORP6 在 PM 的定位被 PI4K 抑制剂抑制。当突变 PSS1 表达时,ORP6 将 PS 从 ER 恢复到 PM。
Oxysterol-binding protein (OSBP)-related protein (ORP) 6, a member of subfamily III in the ORP family, localizes to membrane contact sites between the endoplasmic reticulum (ER) and other organelles and functions in non-vesicular exchange of lipids including phosphatidylinositol-4-phosphate (PI4P) in neurons. In this study, we searched for the lipid counter-transported in exchange for PI4P by using molecular cell biology techniques. Deconvolution microscopy revealed that knockdown of ORP6 partially shifted localization of a phosphatidylserine (PS) marker but not filipin in primary cultured cerebellar neurons. Overexpression of ORP6 constructs lacking the OSBP-related ligand binding domain (ORD) resulted in the same shift of the PS marker. A PI4KⅢα inhibitor specifically inhibiting the synthesis and plasma membrane (PM) localization of PI4P, suppressed the localization of ORP6 and the PS marker at the PM. Overexpression of mutant PS synthase 1 (PSS1) inhibited transport of the PS marker to the PM and relocated the PI4P marker to the PM in Neuro-2A cells. Introduction of ORP6 but not the dominant negative ORP6 constructs, shifted the localization of PS back to the PM. These data collectively suggest the involvement of ORP6 in the counter-transport of PI4P and PS. Knockdown of ORP6 changed localization of PS marker. Localization of PS marker and ORP6 at the PM was suppressed by PI4K inhibitor. ORP6 restored PS from the ER to PM when mutant PSS1 is expressed.
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