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LS-50B Luminescence Spectrometer

Company: Perkin Elmer
Catalog#: 17931
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A Spectrofluorophotometrical Method Based on Fura-2-AM Probe to Determine Cytosolic Ca2+ Level in Pseudomonas syringae Complex Bacterial Cells
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2021-03-20
[Abstract]  

Calcium signaling is an emerging mechanism by which bacteria respond to environmental cues. To measure the intracellular free-calcium concentration in bacterial cells, [Ca2+]i, a simple spectrofluorometric method based on the chemical probe Fura 2-acetoxy methyl ester (Fura 2-AM) is here presented using Pseudomonad bacterial cells. This is an alternative and quantitative method that can be completed in a short period of time with low costs, and it does not require the induction of heterologously expressed protein-based probes like Aequorin. Furthermore, it is possible to verify the properties of membrane channels involved in Ca2+ entry from the extracellular matrix. This method is in particular valuable for measuring [Ca2+]i in the range of 0.1-39.8 µM in small cells like those of

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[摘要]  [摘要]钙信号传导是细菌对环境线索作出反应的一种新兴机制。为了测量细菌细胞中细胞内游离钙的浓度,在此使用假单胞菌细菌细胞,提出一种基于化学探针Fura 2-乙酰氧基甲基酯(Fura 2-AM)的简单分光荧光法[Ca 2+ ] i 。这是一种可替代的定量方法,可在短时间内以低成本完成,并且不需要诱导异源表达的基于蛋白质的探针(如水母发光蛋白)。此外,有可能验证参与Ca 2+从细胞外基质进入的膜通道的特性。该方法对于在像原核生物一样的小细胞中测量[Ca 2+ ] i在0.1-39.8 µM范围内特别有价值。

[背景] Ca 2+是一种新兴的细菌细胞内信使,会影响多种细胞过程,例如维持细胞完整性,细胞分裂(Dominguez等人,2015),运动性(Tisa和Alder,1995;Gode-Potratz等人,2010;Cruz等人,2012;Guragain等人,2013; Parker等人,2015;Fishman等人,2018 ),III型分泌物(DeBord等人,2003;Dasgupta等人,2003)。 ,2006; Gode-Potratz等,2010; Fi shman等,2018),基因表达(Dominguez等,2015),群体感应(Werthén和Lundgren,2001),生物膜形成(Patrauchan等,, 2001)。 2005年; ...

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