Characterization and Diversification of AraC/XylS Family Regulators Guided by Transposon Sequencing

Allison N Pearson, Matthew R Incha, Cindy N Ho, Matthias Schmidt, Jacob B Roberts, Alberto A Nava, Jay D Keasling*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In this study, we explored the development of engineered inducible systems. Publicly available data from previous transposon sequencing assays were used to identify regulators of metabolism in Pseudomonas putida KT2440. For AraC family regulators (AFRs) represented in these data, we posited AFR/promoter/inducer groupings. Twelve promoters were characterized for a response to their proposed inducers in P. putida, and the resultant data were used to create and test nine two-plasmid sensor systems in Escherichia coli. Several of these were further developed into a palette of single-plasmid inducible systems. From these experiments, we observed an unreported inducer response from a previously characterized AFR, demonstrated that the addition of a P. putida transporter improved the sensor dynamics of an AFR in E. coli, and identified an uncharacterized AFR with a novel potential inducer specificity. Finally, targeted mutations in an AFR, informed by structural predictions, enabled the further diversification of these inducible plasmids.
Original languageEnglish
JournalACS Synthetic Biology
ISSN2161-5063
DOIs
Publication statusAccepted/In press - 2024

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