Part:BBa_J15101:Experience

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Applications of BBa_J15101

A relatively well-studied arsenic resistance operon is the one found in Escherichia coli, which contains arsR (transcriptional regulator), arsB (arsenite permease), and arsC (arsenate reductase). When arsenic is absent, the transcription regulator ArsR binds to the ArsR-binding site (ABS) within the ars promoter and blocks transcription. Once arsenic is present, it binds to ArsR and activate the transcription of the ars genes and clear arsenic in the cell. The arsR regulator and the promoter of this operon have been used to construct arsenic whole cell biosensors (WCB) in various microorganism hosts.

When arsenic is absent, the transcription regulator ArsR binds to the ArsR-binding site (ABS) within the ars promoter and blocks transcription. Once arsenic is present, it binds to ArsR and activate the transcription of the downstream genes. We used gfp as a reporter to test its function of arsenic detection. Since this ars system comes from E. coli genome, to eliminate this impact, we used another model bacteria Shewanella oneidensis as the chassis cells to verify the function of this part. As the result shows below, with the arsenic concentration rises, the strain with the reporter produced higher fluorescence intensity. Fig. Fluorescence curve of the reporter strain with different arsenic concentrations

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