Studying protein-reconstituted proteoliposome fusion with content indicators in vitro.

Studying protein-reconstituted proteoliposome fusion with content indicators in vitro.
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DOI:
10.1002/bies.201300010
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发表时间:
2013-07
期刊:
影响因子:
4
通讯作者:
Brunger, Axel T.
Brunger, Axel T.
中科院分区:
生物学3区
文献类型:
--
作者:
Diao, Jiajie;Zhao, Minglei;Zhang, Yunxiang;Kyoung, Minjoung;Brunger, Axel T.

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体外重构法是研究生物膜融合的常用方法。然而,迄今为止,大多数涉及SNARE蛋白的集合和单囊泡实验仅使用脂质混合而不是含量混合指标进行。通过同时检测脂质和小含量混合指标,我们发现在50秒的观察期内,对于Ca2+触发的与SNAREs、全长synaptotagmin-1和complexin的融合,脂质混合通常发生在含量混合前几秒,或者根本没有任何含量混合。我们的结果说明了通常使用的散装脂质混合聚变实验的注意事项。我们建议在蛋白脂质体融合实验中,除了脂质混合指标外,应始终使用含量混合指标或代替含量混合指标。
In vitro reconstitution assays are commonly used to study biological membrane fusion. However, to date, most ensemble and single-vesicle experiments involving SNARE proteins have been performed only with lipid-mixing, but not content-mixing indicators. Through simultaneous detection of lipid and small content-mixing indicators, we found that lipid mixing often occurs seconds prior to content mixing, or without any content mixing at all, during a 50-sec observation period, for Ca2+-triggered fusion with SNAREs, full-length synaptotagmin-1, and complexin. Our results illustrate the caveats of commonly used bulk lipid-mixing fusion experiments. We recommend that proteoliposome fusion experiments should always employ content-mixing indicators in addition to, or in place of, lipid-mixing indicators.
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