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• W2007705491 abstract "Free heme, the protein-unbound form of heme, has both toxic and regulatory effects on cells. To detect free heme at low concentrations, we developed a heme sensor using fluorescently labeled heme oxygenase-1 (HO-1), an enzyme that catalyzes oxidative heme degradation and has a high affinity for heme. The response of the heme sensor is based on the fluorescence quenching that occurs when heme binds to the enzyme. Each of the three fluorescently labeled HO-1s exhibits a 1:1 binding stoichiometry and an absorption spectrum similar to that of the heme complex of the wild-type HO-1. Titration of the labeled proteins with hemin resulted in fluorescence quenching in a hemin concentration-dependent manner, presumably due to an energy transfer from the fluorophore to the heme bound to HO-1. The sensor showed a potent affinity for heme with a dissociation constant in the low nanomolar range and a high selectivity for heme. Based on the linear response of the sensor to heme, we performed a fluorometric microplate assay. The sensor was able to selectively detect free heme but did not respond to heme bound to native hemoglobin. This assay will be a useful tool for determination of free heme in biological samples containing protein-bound heme." @default.
• W2007705491 created "2016-06-24" @default.
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• W2007705491 date "2013-02-01" @default.
• W2007705491 modified "2023-10-17" @default.
• W2007705491 title "Development of a heme sensor using fluorescently labeled heme oxygenase-1" @default.
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• W2007705491 doi "https://doi.org/10.1016/j.ab.2012.10.002" @default.
• W2007705491 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23068042" @default.
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