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Exo-polygalacturonase production enhancement by Piriformospora indica from sugar beet pulp under submerged fermentation using the response surface methodology

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Abstract

This study proposed a novel and cost-effective approach to enhance and optimize the exo-polygalacturonase from P. indica, a root endophytic fungus. In the current investigation, the impact of ammonium sulfate, sugar beet pulp (SBP), and glucose as variables on induction of exo-polygalacturonase from P. indica was optimized using the central composite design (CCD) of response surface methodology (RSM) under submerged fermentation (SmF). Additionally, determination of the exo-polygalacturonase molecular weight and in situ analysis was performed. The optimal reaction conditions, which resulted in the highest enzyme activity, were observed in the following conditions: ammonium sulfate (4 g/L), SBP (20 g/L), and glucose (60 g/L). Under the optimized condition, the maximum enzyme activity reached 19.4 U/ml (127 U/mg), which increased by 5.84 times compared to non-optimized conditions. The exo-polygalacturonase molecular weight was estimated at 60 KDa. In line with the bioinformatic analysis, the exo-polygalacturonase sequence of P. indica showed similarity with Rhizoctonia solani’s and Thanateporus cucumeris. These results indicated that SBP acts as a cheap and suitable inducer of exo-polygalacturonase production by P. indica in submerged cultivation. The outcome of this study will be useful for industries to decrease environmental pollution with cost-effective approaches.

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Acknowledgements

We wish to acknowledge the Management of Research and Technology and the Central laboratory of University of Maragheh for their help in running the experiments.

Funding

Partial financial support was received from University of Maragheh. The funding code is 3567.

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Conceptualization, formal analysis, writing—review and editing, project administration, and supervision were carried out by Parisa Fathi Rezaei. Material preparation, data collection and analysis, and writing original draft preparation were performed by Somayyeh Kiani. Bioinformatic analysis was done by Sina Jamalzadegan. All authors read and approved the final manuscript.

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Correspondence to Parisa Fathi Rezaei.

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Kiani, S., Fathi Rezaei, P. & Jamalzadegan, S. Exo-polygalacturonase production enhancement by Piriformospora indica from sugar beet pulp under submerged fermentation using the response surface methodology. Environ Sci Pollut Res 30, 45815–45826 (2023). https://doi.org/10.1007/s11356-023-25488-6

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