Fusion pores with low conductance are cation selective.

Fusion pores with low conductance are cation selective.
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电导率低的融合孔是阳离子的选择性。

DOI:
10.1016/j.celrep.2021.109580
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发表时间:
2021-08-24
期刊:
影响因子:
8.8
通讯作者:
Lindau M
Lindau M
中科院分区:
生物学1区
文献类型:
--
作者:
Delacruz JB;Sharma S;Rathore SS;Huang M;Lenz JS;Lindau M

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许多神经递质是带净电荷的有机离子,因此它们从分泌囊泡中释放是一个电扩散过程。结合电扩散理论、用阴离子取代法测量嗜铬细胞的安培足信号和分子动力学模拟,研究了嗜铬细胞早期胞外融合孔的选择性。结果表明,极窄的融合孔具有阳离子选择性,而更大的融合孔具有阴离子渗透性。这种转变发生在约300ps的融合孔附近。窄融合孔的阳离子选择性加速了多巴胺、去甲肾上腺素、肾上腺素、血清素和乙酰胆碱等带正电的递质的释放,而谷氨酸的释放可能需要更大的融合孔。为了传输,当SNARE蛋白将囊泡和靶膜结合在一起时形成融合孔。Delacruz等人证明,孔的选择性加速了带正电荷的递质的释放,如多巴胺、去甲肾上腺素、肾上腺素、血清素和乙酰胆碱,而谷氨酸的释放可能需要更大的融合孔。
Many neurotransmitters are organic ions that carry a net charge, and their release from secretory vesicles is therefore an electrodiffusion process. The selectivity of early exocytotic fusion pores is investigated by combining electrodiffusion theory, measurements of amperometric foot signals from chromaffin cells with anion substitution, and molecular dynamics simulation. The results reveal that very narrow fusion pores are cation selective, but more dilated fusion pores become anion permeable. The transition occurs around a fusion pore conductance of ~300 pS. The cation selectivity of a narrow fusion pore accelerates the release of positively charged transmitters such as dopamine, noradrenaline, adrenaline, serotonin, and acetylcholine, while glutamate release may require a more dilated fusion pore. For transmission, a fusion pore forms when vesicle and target membranes are brought together by SNARE proteins. Delacruz et al. demonstrate that selectivity of the pore accelerates release of positively charged transmitters such as dopamine, noradrenaline, adrenaline, serotonin, and acetylcholine, while glutamate release may require a more dilated fusion pore.
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