Phosphatidylinositol (4, 5)-bisphosphate targets double C2 domain protein B to the plasma membrane.

Phosphatidylinositol (4, 5)-bisphosphate targets double C2 domain protein B to the plasma membrane.
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DOI:
10.1111/tra.12528
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发表时间:
2017-12
期刊:
Traffic (Copenhagen, Denmark)
影响因子:
--
通讯作者:
Ashery U
Ashery U
中科院分区:
其他
文献类型:
--
作者:
Michaeli L;Gottfried I;Bykhovskaia M;Ashery U

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DOC 2B是一种高亲和力的Ca 2+传感器,其从胞质溶胶易位到质膜(PM)并促进囊泡引发和融合。然而,其在活细胞中移位和靶向PM的分子机制尚未完全了解。DOC 2B在体外与PM组分磷脂酰丝氨酸、磷脂酰肌醇(4,5)-二磷酸[PI(4,5)P2]和靶向SNARE(t-SNARE)相互作用。在这里,我们表明,PI(4,5)P2水解在PM的活细胞废除DOC 2B易位,而操纵的t-SNARE和其他磷酸肌醇没有影响。此外,我们能够通过在那些膜中合成PI(4,5)P2将DOC 2B重定向到细胞内膜。钙和PI(4,5)P2结合位点的分子动力学模拟和诱变加强了我们的发现,表明钙和PI(4,5)P2都是DOC 2B-PM缔合所需的,并揭示了多种PI(4,5)P2-C2B相互作用。此外,我们表明,DOC 2B易位到PM是ATP-独立的,并发生在扩散样的方式。我们的数据表明,Ca 2+触发的DOC 2B易位是扩散驱动的,并针对PI(4,5)P2-含有膜。
DOC2B is a high-affinity Ca2+ sensor that translocates from the cytosol to the plasma membrane (PM) and promotes vesicle priming and fusion. However, the molecular mechanism underlying its translocation and targeting to the PM in living cells is not completely understood. DOC2B interacts in vitro with the PM components phosphatidylserine, phosphatidylinositol (4,5)-bisphosphate [PI(4,5)P2] and target SNAREs (t-SNAREs). Here we show that PI(4,5)P2 hydrolysis at the PM of living cells abolishes DOC2B translocation, whereas manipulations of t-SNAREs and other phosphoinositides have no effect. Moreover, we were able to redirect DOC2B to intracellular membranes by synthesizing PI(4,5)P2 in those membranes. Molecular dynamics simulations and mutagenesis in the calcium and PI(4,5)P2-binding sites strengthened our findings, demonstrating that both calcium and PI(4,5)P2 are required for the DOC2B–PM association and revealing multiple PI(4,5)P2–C2B interactions. In addition, we show that DOC2B translocation to the PM is ATP-independent, and occurs in a diffusion-like manner. Our data suggest that the Ca2+-triggered translocation of DOC2B is diffusion-driven and aimed at PI(4,5)P2-containing membranes.
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