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Recent Patents on Biotechnology


ISSN (Print): 1872-2083
ISSN (Online): 2212-4012

Research Article

Biodecomposition of Phenanthrene and Pyrene by a Genetically Engineered Escherichia coli

Author(s): Maryam Ahankoub , Gashtasb Mardani, Payam Ghasemi-Dehkordi*, Ameneh Mehri-Ghahfarrokhi, Abbas Doosti, Mohammad-Saeid Jami, Mehdi Allahbakhshian-Farsani, Javad Saffari-Chaleshtori and Mohammad Rahimi-Madiseh

Volume 14 , Issue 2 , 2020

Page: [121 - 133] Pages: 13

DOI: 10.2174/1872208314666200128103513

Price: $65


Background: Genetically engineered microorganisms (GEMs) can be used for bioremediation of the biological pollutants into nonhazardous or less-hazardous substances, at lower cost. Polycyclic aromatic hydrocarbons (PAHs) are one of these contaminants that associated with a risk of human cancer development. Genetically engineered E. coli that encoded catechol 2,3- dioxygenase (C230) was created and investigated its ability to biodecomposition of phenanthrene and pyrene in spiked soil using high-performance liquid chromatography (HPLC) measurement. We revised patents documents relating to the use of GEMs for bioremediation. This approach have already been done in others studies although using other genes codifying for same catechol degradation approach.

Objective: In this study, we investigated biodecomposition of phenanthrene and pyrene by a genetically engineered Escherichia coli.

Methods: Briefly, following the cloning of C230 gene (nahH) into pUC18 vector and transformation into E. coli Top10F, the complementary tests, including catalase, oxidase and PCR were used as on isolated bacteria from spiked soil.

Results: The results of HPLC measurement showed that in spiked soil containing engineered E. coli, biodegradation of phenanthrene and pyrene comparing to autoclaved soil that inoculated by wild type of E. coli and normal soil group with natural microbial flora, were statistically significant (p<0.05). Moreover, catalase test was positive while the oxidase tests were negative.

Conclusion: These findings indicated that genetically manipulated E. coli can provide an effective clean-up process on PAH compounds and it is useful for bioremediation of environmental pollution with petrochemical products.

Keywords: Bioremediation, genetically engineered microorganisms, PAH, catechol 2, 3-dioxygenase, nahH gene, HPLC.

Graphical Abstract
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