Minimally invasive determination of mRNA concentration in single living bacteria.

Minimally invasive determination of mRNA concentration in single living bacteria.
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DOI:
10.1093/nar/gkn329
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发表时间:
2008-07
影响因子:
14.9
通讯作者:
Cluzel, Philippe
Cluzel, Philippe
中科院分区:
生物学2区
文献类型:
--
作者:
Guet, Calin C.;Bruneaux, Luke;Min, Taejin L.;Siegal-Gaskins, Dan;Figueroa, Israel;Emonet, Thierry;Cluzel, Philippe

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荧光相关光谱(FCS)允许表征高浓度的非编码RNA在一个单一的活细菌。在这里,我们将FCS的使用扩展到单个活细胞中低浓度的编码RNA。我们将红色荧光蛋白(RFP)基因和RNA结合蛋白的两个结合位点进行基因融合,其翻译产物仅为RFP蛋白。使用这种结构,我们确定在单细胞中的绝对[mRNA]浓度和相关的[RFP]从诱导型质粒表达。我们发现,FCS方法使我们能够可靠地实时监测[mRNA]低至1040 nM(即每体积检测约两个转录本)。为了验证这些测量结果,我们发现[mRNA]与RFP蛋白的相关表达成正比。这种基于FCS的技术建立了一个框架,用于微创测量单个活细菌中的mRNA浓度。
Fluorescence correlation spectroscopy (FCS) has permitted the characterization of high concentrations of noncoding RNAs in a single living bacterium. Here, we extend the use of FCS to low concentrations of coding RNAs in single living cells. We genetically fuse a red fluorescent protein (RFP) gene and two binding sites for an RNA-binding protein, whose translated product is the RFP protein alone. Using this construct, we determine in single cells both the absolute [mRNA] concentration and the associated [RFP] expressed from an inducible plasmid. We find that the FCS method allows us to reliably monitor in real-time [mRNA] down to ∼40 nM (i.e. approximately two transcripts per volume of detection). To validate these measurements, we show that [mRNA] is proportional to the associated expression of the RFP protein. This FCS-based technique establishes a framework for minimally invasive measurements of mRNA concentration in individual living bacteria.
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