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
中科院分区:
文献类型:
--
作者:
Qin Y;Miranda JG;Stoddard CI;Dean KM;Galati DF;Palmer AE
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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