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Construction of Pseudomonas aeruginosa SDK-6 with synthetic lipase gene cassette and optimization of different parameters using response surface methodology for over-expression of recombinant lipase

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Abstract

Lipases are industrially important enzymes having vast applications in various fields. Cloning and expression of lipase enzyme-encoding genes in suitable host lead to their widespread use in different fields. The present study represents the first attempt towards the expression of the synthetic lipase gene in Pseudomonas aeruginosa. An alkalophilic lipase gene (GenBank accession number: NP_388152) from Bacillus subtilis was synthetically designed and introduced in the pJN105 vector and subsequently cloned in Pseudomonas aeruginosa SDK-6. Agarose gel electrophoresis confirmed the transformation of SDK-6, exhibiting a band difference of ~ 700 bp between native and recombinant pJN105. Further amplification of cloned lipase gene was confirmed using PCR amplification with Lip 1 and Lip 2 primers respectively, followed by restriction analysis. Approximately 15-fold increase in lipase production was observed in recombinant Pseudomonas as compared to the native strain. One factor at a time (OFAT) analysis revealed L-arabinose, inoculum size (0.5%; v/v), and agitation (120 rpm) as significant factors affecting the over-expression of lipase enzyme. Optimization of enzyme induction conditions by central composite design (CCD) led to 1.60-fold increase in the production of lipase at 0.65% (w/v) inducer concentration, OD600—1.075 before induction and 35 °C post induction temperature with overall lipase production of 50.50 IU/mL. Statistical validation of observed value via ANOVA showed an F-value of 138.70 at p < 0.01 with R2 of 0.9921.

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Acknowledgements

The authors are highly obliged to Prof. Caroline S. Harwood (Department of Microbiology, University of Washington, Seattle, USA) for providing the plasmid pJN105 to accomplish this research. The authors would also like to acknowledge the Faculty and Head, Department of Biotechnology and Food Technology, Punjabi University, Patiala, India, for their help and suggestions during this work.

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Dr. Saurabh Gupta designed the study. Ms. Damanjeet Kaur performed the experiments. Dr. Saurabh Gupta analyzed the data. Dr. Rupinder Pal Singh designed the CCD model. Ms. Damanjeet Kaur prepared the first draft of the manuscript. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Saurabh Gupta.

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Kaur, D., Singh, R.P. & Gupta, S. Construction of Pseudomonas aeruginosa SDK-6 with synthetic lipase gene cassette and optimization of different parameters using response surface methodology for over-expression of recombinant lipase. Folia Microbiol (2024). https://doi.org/10.1007/s12223-024-01167-y

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  • DOI: https://doi.org/10.1007/s12223-024-01167-y

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