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- W4308027082 abstract "This paper presents a generalisable method for the calibration of fluorescence readings on microplate readers, in order to convert arbitrary fluorescence units into absolute units. FPCountR relies on the generation of bespoke fluorescent protein (FP) calibrants, assays to determine protein concentration and activity, and a corresponding analytical workflow. We systematically characterise the assay protocols for accuracy, sensitivity and simplicity, and describe an 'ECmax' assay that outperforms the others and even enables accurate calibration without requiring the purification of FPs. To obtain cellular protein concentrations, we consider methods for the conversion of optical density to either cell counts or alternatively to cell volumes, as well as examining how cells can interfere with protein counting via fluorescence quenching, which we quantify and correct for the first time. Calibration across different instruments, disparate filter sets and mismatched gains is demonstrated to yield equivalent results. It also reveals that mCherry absorption at 600 nm does not confound cell density measurements unless expressed to over 100,000 proteins per cell. FPCountR is presented as pair of open access tools (protocol and R package) to enable the community to use this method, and ultimately to facilitate the quantitative characterisation of synthetic microbial circuits." @default.
- W4308027082 created "2022-11-07" @default.
- W4308027082 creator A5035957501 @default.
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- W4308027082 date "2022-11-03" @default.
- W4308027082 modified "2023-09-30" @default.
- W4308027082 title "Absolute protein quantification using fluorescence measurements with FPCountR" @default.
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- W4308027082 doi "https://doi.org/10.1038/s41467-022-34232-6" @default.
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- W4308027082 hasPublicationYear "2022" @default.
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