The Chromobacterium violaceum ArsR Arsenite Repressor Exerts Tighter Control on Its Cognate Promoter Than the Escherichia coli System
| Autor: | Lummy Maria Oliveira Monteiro, Letícia Magalhães Arruda, Rafael Silva-Rocha |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Microbiology (medical) Response element lcsh:QR1-502 Repressor arsenic response system 010501 environmental sciences medicine.disease_cause 01 natural sciences Microbiology lcsh:Microbiology regulatory network ars operon 03 medical and health sciences chemistry.chemical_compound BACTÉRIAS GRAM-NEGATIVAS medicine Inducer Escherichia coli 0105 earth and related environmental sciences Arsenite ArsR/SmtB family biology biology.organism_classification 030104 developmental biology chemistry Biochemistry cis-regulatory elements Chromobacterium violaceum Ars operon Bacteria |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP Frontiers in Microbiology, Vol 7 (2016) |
| ISSN: | 1664-302X |
| DOI: | 10.3389/fmicb.2016.01851 |
| Popis: | Environmental bacteria are endowed with several regulatory systems that have potential applications in biotechnology. In this report, we characterize the arsenic biosensing features of the ars response system from Chromobacterium violaceum in the heterologous host Escherichia coli. We show that the native Pars/arsR system of C. violaceum outperforms the chromosomal ars copy of E. coli when exposed to micromolar concentrations of arsenite. To understand the molecular basis of this phenomenon, we analyzed the interaction between ArsR regulators and their promoter target sites as well as induction of the system at saturating concentrations of the regulators. In vivo titration experiments indicate that ArsR from C. violaceum has stronger binding affinity for its target promoter than the regulator from E. coli does. Additionally, arsenite induction experiments at saturating regulator concentration demonstrates that although the Pars/arsR system from E. coli displays a gradual response to increasing concentration of the inducer, the system from C. violaceum has a steeper response with a stronger promoter induction after a given arsenite threshold. Taken together, these data demonstrate the characterization of a novel arsenic response element from an environmental bacterium with potentially enhanced performance that could be further explored for the construction of an arsenic biosensor. |
| Databáze: | OpenAIRE |
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