A genetically encoded probe for monitoring and detection of iron in real-time†

IF 3.5 Q2 CHEMISTRY, ANALYTICAL
Neha Soleja and Mohd. Mohsin
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Abstract

Iron, the most abundant transition metal in the body, regulates cellular function but can be harmful in excess, leading to reactive oxygen species production and cellular damage. Intracellular Fe2+ exerts a significant impact on cellular function, potentially contributing to various critical diseases. To address this, detection methods need high selectivity, sensitivity, and real-time monitoring capabilities, essential for comprehending disease progression. This necessitates advancements beyond conventional detection approaches. Frataxin, a crucial mitochondrial protein, is indispensable for sustaining life, contributing not only to iron metabolism but also to the formation of iron–sulfur clusters critical for cellular function. Its deficiency is implicated in neurodegenerative diseases. We have developed a nanosensor, based on fluorescence resonance energy transfer (FRET), designed to probe iron efflux mechanisms and facilitate dynamic monitoring of iron concentration and its spatial distribution within living cells. To construct this nanosensor, we strategically positioned CyaY, a bacterial frataxin ortholog, between ECFP and Venus, forming a FRET pair. This innovative nanosensor, designated as FeOS (iron optical sensor), demonstrates exceptional selectivity for iron and maintains stability under physiological pH conditions. Additionally, we engineered three mutant variants: I17C, AD10-I17C, and D76H, with A10D-I17C displaying the highest affinity for iron and a broad detection range. The distinguishing feature of this sensor is that it is genetically encoded, facilitating real-time detection of iron levels within living cells.

Abstract Image

Abstract Image

用于实时监测和检测铁的基因编码探针
铁是人体内含量最丰富的过渡金属,它能调节细胞功能,但过量也会对人体有害,导致活性氧生成和细胞损伤。细胞内的 Fe2+ 对细胞功能有重大影响,可能导致各种严重疾病。为此,检测方法需要具有高选择性、高灵敏度和实时监测能力,这对了解疾病的进展情况至关重要。这就需要超越传统的检测方法。Frataxin是一种重要的线粒体蛋白,是维持生命不可或缺的物质,它不仅有助于铁代谢,还有助于形成对细胞功能至关重要的铁硫簇。它的缺乏与神经退行性疾病有关。我们开发了一种基于荧光共振能量转移(FRET)的纳米传感器,旨在探测铁外流机制,并促进对铁浓度及其在活细胞内空间分布的动态监测。为了构建这种纳米传感器,我们战略性地将细菌 frataxin 同源物 CyaY 放在 ECFP 和 Venus 之间,形成一对 FRET。这种创新型纳米传感器被命名为 FeOS(铁光学传感器),它对铁具有卓越的选择性,并能在生理 pH 条件下保持稳定。此外,我们还设计了三种突变变体:其中 A10D-I17C 对铁的亲和力最高,检测范围也最广。这种传感器的显著特点是它是基因编码的,便于实时检测活细胞内的铁含量。
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CiteScore
2.30
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0.00%
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