Construction of a bacterial biosensor for styrene.

Area of Science:

• Microbiology
• Environmental Biotechnology
• Genetic Engineering

Background:

• Styrene is a significant industrial chemical with environmental implications.
• Development of sensitive and specific biosensors is crucial for monitoring styrene pollution.
• Whole-cell bacterial biosensors offer a promising approach for detecting environmental contaminants.

Purpose of the Study:

• To develop and characterize a novel bacterial whole-cell biosensor for styrene.
• To engineer a Pseudomonas sp. strain capable of detecting and degrading styrene.
• To investigate the specificity and response of the biosensor to various related compounds.

Main Methods:

• Construction of a translational fusion of the lacZ gene to the sty promoter of Pseudomonas sp. strain Y2.
• Insertion of the fusion into the miniTn5 transposon system.
• Transposition of the recombinant transposon to the chromosome of Pseudomonas sp. strain Y2.
• Characterization of beta-galactosidase activity in response to styrene and other aromatic compounds.

Main Results:

• A functional whole-cell biosensor for styrene was successfully constructed and characterized.
• The biosensor demonstrated the ability to detect and degrade styrene.
• Expression of beta-galactosidase was induced by styrene, toluene, epoxystyrene, phenylacetaldehyde, and 2-phenylethanol.
• Quantitative differences in induction were observed for various compounds, indicating some specificity.
• Non-inducing compounds influenced the sensitivity of the biosensor to styrene in mixtures.

Conclusions:

• The developed Pseudomonas sp. strain serves as an effective whole-cell biosensor for styrene detection.
• The biosensor exhibits a response to styrene and related compounds, with quantitative variations.
• The system holds potential for environmental monitoring applications, with further characterization of mixture effects needed.