Cover image of the article: Engineering the pPICZαA Vector for Optimized Recombinant Protein Expression in Pichia pastoris: Substitution of Antibiotic Resistance and Auxotrophic Selection Markers

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Engineering the pPICZαA Vector for Optimized Recombinant Protein Expression in Pichia pastoris: Substitution of Antibiotic Resistance and Auxotrophic Selection Markers

Authors

Salimeh Hassani1, Elham Behvandi1, Ghasem Bagherpour2,*
1Student Research Committee, Zanjan University of Medical Sciences, Zanjan, Iran
2Zanjan Pharmaceutical Biotechnology Research Center, Zanjan University of Medical Sciences, Zanjan, Iran
*Corresponding Author: Department of Medical Biotechnology, Zanjan University of Medical Sciences, Zanjan, Iran. Email: [email protected]

Koomesh:Vol. 28, issue 1; e165404
Published online:Jan 31, 2026
Article type:Research Article
How to Cite:Hassani S, Behvandi E, Bagherpour G. Engineering the pPICZαA Vector for Optimized Recombinant Protein Expression in Pichia pastoris: Substitution of Antibiotic Resistance and Auxotrophic Selection Markers. koomesh. 2026;28(1):e165404. doi: https://doi.org/10.69107/koomesh-165404

Abstract

Background: Plasmids play a crucial role in biotechnology by facilitating the transfer and manipulation of heterologous DNA in host cells for the production of recombinant proteins. The pPICZαA plasmid, featuring the AOX1 promoter, is regarded as one of the best expression vectors in Pichia pastoris strains. However, the product of the zeocin antibiotic resistance gene (BleR) can be toxic to the host during stable growth, and the high cost of this antibiotic presents a significant barrier to the use of this plasmid.

 

 

Objectives: This study aims to clone the kanamycin resistance gene (KanR) and the histidinol dehydrogenase gene (HIS4) to facilitate the selection of clones in transformed bacteria using the KanR gene and in histidine auxotrophic yeasts, while also reducing costs by eliminating the need for zeocin.

 

 

Methods: PCR and cloning steps were performed for each of the target genes in the pPICZαA plasmid. Subsequently, the GFP gene was cloned as a control to test the functionality of the KanR resistance gene in bacteria within the pPICZαA plasmid. Functional testing of the his4 gene in the histidine auxotrophic Pichia pastoris GS115 was conducted after cloning the target gene in YNB medium, both with and without histidine amino acid.

 

 

Results: The PCR and cloning steps for both target genes in the pPICZαA plasmid were successfully completed, demonstrating positive antibiotic resistance to KanR and growth in a medium lacking histidine amino acids. The expression of the GFP gene was confirmed through Western blotting.

 

 

Conclusion: The modified pPICZαA plasmid enabled selection in bacteria using the kanamycin resistance gene and in histidine auxotrophic yeast Pichia pastoris using the histidinol dehydrogenase gene (HIS4). This approach can significantly reduce cloning and expression costs in yeast.

 

 

Highlights

References

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Copyright

© 2026, Author(s). This open-access article is available under the Creative Commons Attribution 4.0 (CC BY 4.0) International License (https://creativecommons.org/licenses/by/4.0/), which allows for unrestricted use, distribution, and reproduction in any medium, provided that the original work is properly cited.

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