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Production of Bioactive Human PAX4 Protein from E. coli

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Abstract

Paired box 4 (PAX4) is a pivotal transcription factor involved in pancreatogenesis during embryogenesis, and in adults, it is key for β-cell proliferation and survival. Additionally, PAX4 also functions as a tumor suppressor protein in human melanomas. The present study demonstrates the production of bioactive recombinant human PAX4 transcription factor. At first, the inserts (PAX4 protein-coding sequence having tags at either ends) were cloned in an expression vector to give rise to pET28a(+)-HTN-PAX4 and pET28a(+)-PAX4-NTH genetic constructs, and these were then transformed into Escherichia coli (E. coli) for their expression. The HTN-PAX4 and PAX4-NTH fusion proteins produced were purified with a yield of ~ 3.15 mg and ~ 0.83 mg, respectively, from 1.2 L E. coli culture. Further, the secondary structure retention of the PAX4 fusion proteins and their potential to internalize the mammalian cell and its nucleus was demonstrated. The bioactivity of these fusion proteins was investigated using various assays (cell migration, cell proliferation and cell cycle assays), demonstrating it to function as a tumor suppressor protein. Thus, this macromolecule can prospectively help understand the function of human PAX4 in cellular processes, disease-specific investigations and direct cellular reprogramming.

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Acknowledgements

The work was funded by the Ministry of Science and Technology, Government of India (Ref. No.: BT/COE/34/SP28408/2018) under NECBH outreach program hosted by IIT Guwahati sponsored by DBT. We also thank Prof. Siddhartha Sankar Ghosh, Department of Biosciences and Bioengineering and Centre for Nanotechnology, IIT Guwahati, for their assistance in flow cytometry.

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GN conceptualized and designed the study, performed the experiments, collected, assembled and analyzed the data, wrote the manuscript and approved the final draft of the manuscript; AA and PS performed the experiments, analyzed the data and approved the final draft of the manuscript; SN analyzed and interpreted the data and approved the final draft of the manuscript; and RPT conceptualized and designed the study, analyzed the data, supervised the experiments, wrote the manuscript, approved the final draft of the manuscript and financial support.

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Correspondence to Rajkumar P Thummer.

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Figure S1 Clonal selection to achieve maximal soluble expression.

Multiple transformed colonies harboring either HTN-PAX4 or PAX4-NTH constructs were screened to obtain maximal expression of full length PAX4 protein. (A) 12% SDS-PAGE analysis for multiple HTN-PAX4 and PAX-NTH clones (B) Representative western blots for data of (A). C (1–4), Clone (1–4); NT, HTN-PAX4; CT, PAX4-NTH; L, Lysate; S, Supernatant; kDa, kilodalton; α-His Ab, anti-Histidine antibody

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Narayan, G., Agrawal, A., Sen, P. et al. Production of Bioactive Human PAX4 Protein from E. coli. Protein J 42, 766–777 (2023). https://doi.org/10.1007/s10930-023-10143-3

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