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Semisynthetic biosensors for mapping cellular concentrations of nicotinamide adenine dinucleotides.


ABSTRACT: We introduce a new class of semisynthetic fluorescent biosensors for the quantification of free nicotinamide adenine dinucleotide (NAD+) and ratios of reduced to oxidized nicotinamide adenine dinucleotide phosphate (NADPH/NADP+) in live cells. Sensing is based on controlling the spatial proximity of two synthetic fluorophores by binding of NAD(P) to the protein component of the sensor. The sensors possess a large dynamic range, can be excited at long wavelengths, are pH-insensitive, have tunable response range and can be localized in different organelles. Ratios of free NADPH/NADP+ are found to be higher in mitochondria compared to those found in the nucleus and the cytosol. By recording free NADPH/NADP+ ratios in response to changes in environmental conditions, we observe how cells can react to such changes by adapting metabolic fluxes. Finally, we demonstrate how a comparison of the effect of drugs on cellular NAD(P) levels can be used to probe mechanisms of action.

SUBMITTER: Sallin O 

PROVIDER: S-EPMC5990361 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature

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Semisynthetic biosensors for mapping cellular concentrations of nicotinamide adenine dinucleotides.

Sallin Olivier O   Reymond Luc L   Gondrand Corentin C   Raith Fabio F   Koch Birgit B   Johnsson Kai K  

eLife 20180529


We introduce a new class of semisynthetic fluorescent biosensors for the quantification of free nicotinamide adenine dinucleotide (NAD<sup>+</sup>) and ratios of reduced to oxidized nicotinamide adenine dinucleotide phosphate (NADPH/NADP<sup>+</sup>) in live cells. Sensing is based on controlling the spatial proximity of two synthetic fluorophores by binding of NAD(P) to the protein component of the sensor. The sensors possess a large dynamic range, can be excited at long wavelengths, are pH-ins  ...[more]

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