Phosphorylation of Ykt6 SNARE Domain Regulates Its Membrane Recruitment and Activity.

Phosphorylation of Ykt6 SNARE Domain Regulates Its Membrane Recruitment and Activity.
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Ykt6SNARE结构域的磷酸化调节其膜的募集和活性。

DOI:
10.3390/biom10111560
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发表时间:
2020-11-16
期刊:
影响因子:
5.5
通讯作者:
Gross JC
Gross JC
中科院分区:
生物学2区
文献类型:
--
作者:
Karuna M P;Witte L;Linnemannstoens K;Choezom D;Danieli-Mackay A;Honemann-Capito M;Gross JC

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敏感因子附着蛋白受体(SNARE)蛋白是调节特定囊泡群及其靶细胞器的膜融合的重要蛋白质转运介质。SNARE蛋白Ykt6缺乏跨膜结构域并附着在不同的细胞器膜上。从机制上讲,Ykt6活性被认为是通过从封闭的细胞质形式到开放的膜结合形式的构象变化来调节的,但调节这种转变的机制尚不清楚。我们在Ykt6的SNARE域中发现了磷酸化位点,介导Ykt6膜募集,对细胞生长至关重要。利用邻近依赖标记和膜分离,我们发现磷酸化调节Ykt6从封闭构象到开放构象的转化。这种构象开关将Ykt6招募到几个细胞器膜上,在那里它以浓度依赖的方式调节Wnt蛋白的运输和细胞外囊泡的分泌。我们提出,其SNARE结构域的磷酸化导致细胞质内自抑制的Ykt6构象转换为不同膜上的活性SNARE。
Sensitive factor attachment protein receptors (SNARE) proteins are important mediators of protein trafficking that regulate the membrane fusion of specific vesicle populations and their target organelles. The SNARE protein Ykt6 lacks a transmembrane domain and attaches to different organelle membranes. Mechanistically, Ykt6 activity is thought to be regulated by a conformational change from a closed cytosolic form to an open membrane-bound form, yet the mechanism that regulates this transition is unknown. We identified phosphorylation sites in the SNARE domain of Ykt6 that mediate Ykt6 membrane recruitment and are essential for cellular growth. Using proximity-dependent labeling and membrane fractionation, we found that phosphorylation regulates Ykt6 conversion from a closed to an open conformation. This conformational switch recruits Ykt6 to several organelle membranes, where it functionally regulates the trafficking of Wnt proteins and extracellular vesicle secretion in a concentration-dependent manner. We propose that phosphorylation of its SNARE domain leads to a conformational switch from a cytosolic, auto-inhibited Ykt6 to an active SNARE at different membranes.
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