Sec16 alternative splicing dynamically controls COPII transport efficiency

Sec16 alternative splicing dynamically controls COPII transport efficiency
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Sec16选择性拼接动态控制COPII传输效率

DOI:
10.1038/ncomms12347
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发表时间:
2016
影响因子:
16.6
通讯作者:
Heyd F
Heyd F
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wilhelmi I;Kanski R;Neumann A;Herdt O;Hoff F;Jacob R;Preussner M;Heyd F

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分泌蛋白从内质网(ER)到高尔基体的运输依赖于copii包被的囊泡。虽然已经确定了COPII机制的基本原理,但COPII运输如何调节以适应组织或激活特异性的货物负载和身份差异仍然是未知的。本研究表明,激活诱导的sec16选择性剪接控制了COPII转运对t细胞激活时分泌货物增加的适应性。利用剪接位点阻断morpholinos和CRISPR/ cas9介导的基因组工程,我们发现ER退出位点的数量、COPII动力学和运输效率取决于sec16选择性剪接。作为机制基础,我们认为c端Sec16结构域是剪接控制的蛋白质相互作用平台,个体同工异构体表现出招募COPII组分的不同能力。我们的工作将COPII途径与选择性剪接联系起来,为蛋白质分泌及其对不断变化的细胞环境的适应增加了一个新的调控层。
The transport of secretory proteins from the endoplasmic reticulum (ER) to the Golgi depends on COPII-coated vesicles. While the basic principles of the COPII machinery have been identified, it remains largely unknown how COPII transport is regulated to accommodate tissue- or activation-specific differences in cargo load and identity. Here we show that activation-induced alternative splicing ofSec16controls adaptation of COPII transport to increased secretory cargo upon T-cell activation. Using splice-site blocking morpholinos and CRISPR/Cas9-mediated genome engineering, we show that the number of ER exit sites, COPII dynamics and transport efficiency depend onSec16alternative splicing. As the mechanistic basis, we suggest the C-terminal Sec16 domain to be a splicing-controlled protein interaction platform, with individual isoforms showing differential abilities to recruit COPII components. Our work connects the COPII pathway with alternative splicing, adding a new regulatory layer to protein secretion and its adaptation to changing cellular environments.
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