Proteomics

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FRET monitoring of transcription factor activities in living bacteria


ABSTRACT: Abstract: Bacteria adapt to the constantly changing environments largely by transcriptional regulation through the activities of various transcription factors (TFs). However, techniques that monitor the in situ TF-promoter interactions in living bacteria are lacking. Herein, we developed a whole-cell TF-promoter binding assay based on the intermolecular Förster resonance energy transfer (FRET) between a fluorescent unnatural amino acid CouA which is genetically encoded into defined sites in TFs and the live cell fluorescent nucleic acid stain SYTO 9. We show that this new FRET pair monitors the intricate TF-promoter interactions elicited by various types of signal transduction systems with specificity and sensitivity. Furthermore, the assay is applicable to identify novel modulators of the regulatory systems of interest and monitor TF activities in bacteria colonized in C. elegans. In conclusion, we established a tractable and sensitive TF-promoter binding assay in living bacteria which not only complements currently available approaches for DNA-protein interactions but also provides novel opportunities for functional annotation of bacterial signal transduction systems and studies of the bacteria-host interface

INSTRUMENT(S): Orbitrap Fusion Lumos

ORGANISM(S): Escherichia Coli Bacteria

SUBMITTER: Pengchao Wang  

LAB HEAD: Dr. Aixin Yan

PROVIDER: PXD030973 | Pride | 2022-10-13

REPOSITORIES: Pride

Dataset's files

Source:
Action DRS
01_CueR-F58CouA.raw Raw
02_PhoP-A182CouA_R.raw Raw
BasR.raw Raw
checksum.txt Txt
proteinGroups.txt Txt
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Publications

Whole-cell FRET monitoring of transcription factor activities enables functional annotation of signal transduction systems in living bacteria.

Wang Pengchao P   Zhang Guangming G   Xu Zeling Z   Chen Zhe Z   Liu Xiaohong X   Wang Chenyin C   Zheng Chaogu C   Wang Jiangyun J   Zhang Hongmin H   Yan Aixin A  

The Journal of biological chemistry 20220714 8


Bacteria adapt to their constantly changing environments largely by transcriptional regulation through the activities of various transcription factors (TFs). However, techniques that monitor TF-promoter interactions in situ in living bacteria are lacking. Herein, we developed a whole-cell TF-promoter binding assay based on the intermolecular FRET between an unnatural amino acid, l-(7-hydroxycoumarin-4-yl) ethylglycine, which labels TFs with bright fluorescence through genetic encoding (donor flu  ...[more]

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