Direct comparison of a genetically encoded sensor and small molecule indicator: implications for quantification of cytosolic Zn(2+).

Direct comparison of a genetically encoded sensor and small molecule indicator: implications for quantification of cytosolic Zn(2+).
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DOI:
10.1021/cb4003859
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发表时间:
2013-11-15
影响因子:
4
通讯作者:
Palmer AE
Palmer AE
中科院分区:
生物学2区
文献类型:
--
作者:
Qin Y;Miranda JG;Stoddard CI;Dean KM;Galati DF;Palmer AE

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荧光传感器是可视化和定量活细胞中分子和离子的强大工具。已经开发了各种小分子和遗传编码的传感器用于研究细胞内Zn 2+稳态和信号传导,但是没有直接的比较存在,使得研究人员难以确定用于给定应用的适当传感器。在这里,我们直接比较了广泛使用的小分子探针FluoZin-3和遗传编码的传感器ZapCY 2。我们证明,与FluoZin-3相比,ZapCY 2表现出明确的胞质定位,提供了Zn 2+浓度的估计,几乎没有变化,不干扰胞质Zn 2+水平,并表现出快速的Zn 2+响应动力学。ZapCY 2用于测量5种不同细胞类型中的Zn 2+浓度,揭示了与正常前列腺细胞相比,前列腺癌细胞中更高的胞质Zn 2+水平(尽管前列腺癌细胞中的总锌减少),表明了不同的调节机制。
Fluorescent sensors are powerful tools for visualizing and quantifying molecules and ions in living cells. A variety of small molecule and genetically encoded sensors have been developed for studying intracellular Zn2+ homeostasis and signaling, but no direct comparisons exist making it challenging for researchers to identify the appropriate sensor for a given application. Here we directly compare the widely used small molecule probe FluoZin-3 and a genetically encoded sensor, ZapCY2. We demonstrate that, in contrast to FluoZin-3, ZapCY2 exhibits a well defined cytosolic localization, provides estimates of Zn2+ concentration with little variability, does not perturb cytosolic Zn2+ levels, and exhibits rapid Zn2+ response dynamics. ZapCY2 was used to measure Zn2+ concentrations in 5 different cell types, revealing higher cytosolic Zn2+ levels in prostate cancer cells compared to normal prostate cells (although the total zinc is reduced in prostate cancer cells) , suggesting distinct regulatory mechanisms.
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