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• W2019433479 abstract "Aequorin is a calcium-dependent bioluminescent protein isolated from the hydromedusan Aequorea victoria. The gene for aequorin has been cloned and overexpressed in Escherichia coli [Prasher et al. (1985) Biochem. Biophys. Res. Commun. 126, 1259; Prasher et al. (1987) Biochemistry 26, 1326]. Higher levels of expression have recently been obtained by subcloning aequorin cDNA into the pRC23 plasmid vector such that its expression is under control of the lambda PL promoter [Cormier et al. (1989) Photochem. Photobiol. 49, 509]. Purification of recombinant apoaequorin from E. coli containing this new recombinant plasmid (pAEQ1.3) was accomplished by a two-step procedure involving gel filtration and anion-exchange chromatography on Sephadex G-100 and DEAE-Sepharose, respectively. Typically, 400-500 mg of recombinant protein was obtained from 100 L of fermentation culture. The purified recombinant apoaequorin could be converted to aequorin in high yield upon incubation with synthetic coelenterate luciferin, dissolved oxygen, and a thiol reagent with a photon yield similar to the native photoprotein. Detection of recombinant aequorin in the Dynatech ML1000 Microplate luminometer was linear between 10(-18) and 10(-12) mol, and little loss of specific activity was observed when the protein was derivatized with biotin. The biotinylated derivative was stable when frozen, lyophilized, or stored at 4 degrees C. The feasibility of using biotinylated aequorin as a nonradioactive tag was established by its application in a variety of solid-phase assay formats using the high-affinity streptavidin/biotin interaction. A microtiter-based bioluminescent immunoassay (BLIA) using biotinylated aequorin and the ML1000 luminometer was developed for the detection of subnanogram amounts of a glycosphingolipid (Forsmann antigen). In addition, nanogram to subnanogram quantities of protein antigens and DNA, immobilized on Western and Southern blots, respectively, were detected on instant and X-ray films using biotinylated aequorin." @default.
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• W2019433479 date "1992-02-11" @default.
• W2019433479 modified "2023-09-23" @default.
• W2019433479 title "Use of recombinant biotinylated aequorin in microtiter and membrane-based assays: Purification of recombinant apoaequorin from Escherichia coli" @default.
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• W2019433479 doi "https://doi.org/10.1021/bi00120a021" @default.
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