Abstract
NanoLuc luciferase (Nluc) is an engineered enzyme that catalyses the substrate, furimazine, to produce light. Nluc has higher sensitivity than the commonly used bioluminescent reporter, firefly luciferase (FFluc). We have introduced Nluc into a toxin–antitoxin stabilised plasmid for the efficient labeling of group A Streptococcus. Comparison of signal strength and kinetic properties between Nluc-labeled bacteria and similarly previously-labeled FFluc bacteria, showed that the bioluminescent signal produced by Nluc-labeled bacteria is up to 15-times higher than FFluc-labeled bacteria during the logarithmic phase. However, with Nluc we were unable to differentiate between bacteria that are metabolically active and inactive because of its ATP-independence. Nluc therefore offers a more sensitive reporter but, perhaps, one more restricted for downstream applications.
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Acknowledgments
We would like to thank Fiona Clow for proof-reading the manuscript. This project was supported by a research grant from the Health Research Council (HRC) New Zealand.
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Loh, J.M.S., Proft, T. Comparison of firefly luciferase and NanoLuc luciferase for biophotonic labeling of group A Streptococcus . Biotechnol Lett 36, 829–834 (2014). https://doi.org/10.1007/s10529-013-1423-z
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DOI: https://doi.org/10.1007/s10529-013-1423-z