Development of a Bacterial Biosensor for Rapid Screening of Yeast p-Coumaric Acid Production

Solvej Siedler, Narendar K. Khatri, Andrea Zsohar, Inge Kjærbølling, Michael Vogt, Petter Hammar, Christian Førgaard Nielsen, Jan Marienhagen, Morten Otto Alexander Sommer, Haakan N. Joensson

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Abstract

Transcription factor-based biosensors are used to identify producer strains, a critical bottleneck in cell factory engineering. Here, we address two challenges with this methodology: transplantation of heterologous transcriptional regulators into new hosts to generate functional biosensors and biosensing of the extracellular product concentration that accurately reflects the effective cell factory production capacity. We describe the effects of different translation initiation rates on the dynamic range of a p-coumaric acid biosensor based on the Bacillus subtilis transcriptional repressor PadR by varying its ribosomal binding site. Furthermore, we demonstrate the functionality of this p-coumaric acid biosensor in Escherichia coli and Corynebacterium glutamicum. Finally, we encapsulate yeast p-coumaric acid-producing cells with E. coli-biosensing cells in picoliter droplets and, in a microfluidic device, rapidly sort droplets containing yeast cells producing high amounts of extracellular p-coumaric acid using the fluorescent E. coli biosensor signal. As additional biosensors become available, such approaches will find broad applications for screening of an extracellular product.
Original languageEnglish
JournalA C S Synthetic Biology
Volume6
Issue number10
Pages (from-to)1860-1869
ISSN2161-5063
DOIs
Publication statusPublished - 2017

Cite this

Siedler, S., Khatri, N. K., Zsohar, A., Kjærbølling, I., Vogt, M., Hammar, P., Nielsen, C. F., Marienhagen, J., Sommer, M. O. A., & Joensson, H. N. (2017). Development of a Bacterial Biosensor for Rapid Screening of Yeast p-Coumaric Acid Production. A C S Synthetic Biology, 6(10), 1860-1869. https://doi.org/10.1021/acssynbio.7b00009