Development of a 2-Nitrobenzoate-Sensing Bioreporter Based on an Inducible Gene Cluster

Frontiers in Microbiology
Satamita DebTapan K Dutta

Abstract

Based on the sole information of structural genes of the 2-nitrobenzoate (2NBA) utilizing catabolic gene cluster (onbX1X2FCAR1EHJIGDBX3), 2NBA-sensing bioreporters were constructed by incorporatingegfpinto theonbgene cluster ofCupriavidussp. strain ST-14. Incorporation of reporter gene in proximal to the hypothesized promoter region in conjunction with the disruption of the gene encoding inducer-metabolizing enzyme was turned out to be advantageous in reporter gene expression at low inducer concentration. The bioreporter strain was capable of expressing EGFP from the very 1st hour of induction and could detect 2NBA at (sub) nanomolar level exhibiting a strict specificity toward 2NBA, displaying no response to EGFP expression from itsmeta- andpara-isomers as well as from a number of structurally related compounds. The present study is a successful demonstration of the development of a 2NBA-sensing bioreporter with respect to ease of construction, inducer specificity, and sensitivity, without prior knowledge of the associated inducer-responsive promoter-regulator elements. The present approach can be used as a model for the development of bioreporters for other environmental pollutants.

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Methods Mentioned

BETA
biosensor
PCR
confocal microscopy
FACS
PCA
enzymatic assay
Flow Cytometric

Software Mentioned

FACSUIT

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