Selective export of autotaxin from the endoplasmic reticulum

Selective export of autotaxin from the endoplasmic reticulum
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自内质网选择性输出自分泌运动因子

DOI:
10.1074/jbc.m116.774356
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发表时间:
2017-03
影响因子:
4.8
通讯作者:
Junjie Zhang
Junjie Zhang
中科院分区:
生物学2区
文献类型:
--
作者:
Lin Lyu;Baolu Wang;Chaoyang Xiong;Xiaotian Zhang;Xiaoyan Zhang;Junjie Zhang

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自分泌运动因子 (ATX) 或外核苷酸焦磷酸酶/磷酸二酯酶 2 (ENPP2) 是一种分泌性糖蛋白,是溶血磷脂酸生成的关键酶。 ATX 蛋白运输的机制很大程度上未知。在这里,我们证明p23(p24蛋白家族的成员)是ATX内质网(ER)输出所需的蛋白质分选受体。人 ATX C 末端区域的二苯丙氨酸 (Phe-838/Phe-839) 基序被确定为 ATX-p23 相互作用所必需的转运信号。通过 siRNA 敲除单个 Sec24 同工型表明,仅当 Sec24C 下调时,ATX 的 ER 输出才会受损。这些结果表明 ATX 通过 p23、Sec24C 依赖性途径选择性地从 ER 输出。此外,还发现AKT信号传导在ATX分泌调节中发挥作用,通过增强活化T细胞介导的p23表达的核因子来促进ATX ER输出。此外,二疏水氨基酸基序(FY)也存在于人ENPP1和ENPP3的C端区域。这种依赖于 p23、Sec24C 的选择性 ER 输出机制在这些 ENPP 家族成员中是保守的。
Autotaxin (ATX) or ectonucleotide pyrophosphatase/phosphodiesterase 2 (ENPP2) is a secretory glycoprotein and functions as the key enzyme for lysophosphatidic acid generation. The mechanism of ATX protein trafficking is largely unknown. Here, we demonstrated that p23, a member of the p24 protein family, was the protein-sorting receptor required for endoplasmic reticulum (ER) export of ATX. A di-phenylalanine (Phe-838/Phe-839) motif in the human ATX C-terminal region was identified as a transport signal essential for the ATX-p23 interaction. Knockdown of individual Sec24 isoforms by siRNA revealed that ER export of ATX was impaired only if Sec24C was down-regulated. These results suggest that ATX is selectively exported from the ER through a p23, Sec24C-dependent pathway. In addition, it was found that AKT signaling played a role in ATX secretion regulation to facilitate ATX ER export by enhancing the nuclear factor of activated T cell-mediated p23 expression. Furthermore, the di-hydrophobic amino acid motifs (FY) also existed in the C-terminal regions of human ENPP1 and ENPP3. Such a p23, Sec24C-dependent selective ER export mechanism is conserved among these ENPP family members.
自分泌运动因子-溶血磷脂酸轴在癌症对化疗和放疗的抵抗中的作用。
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