Original Article

Comparing the Yield of Recombinant Human Factor VII Protein Expressed by the rDNA-Promoter with the CMV-Promoter in Iranian Lizard Leishmania

Abstract

Background: Iranian Lizard Leishmania (I.L.L) is a nonpathogenic Leishmania strain. Due to its advantages, several recombinant proteins have been produced in this host. However, I.L.L shows a lower yield of recombinant protein expression compared to other commercial hosts. Considering the role of protease enzymes in protein digestion, we selected cysteine protease B (CPB) to investigate its impact on recombinant protein yield in I.L.L.

Methods: we generated gene knockouts by utilizing homologous recombination (HR) and CRISPR methods. To assess the efficacy of the designed construct, we compared the yield of recombinant human factor VII (rhFVII) production between cells transfected with the pLEXSY-hyg2-FVII vector and the CMV-promoter-based construct (pF7cmvneo).

Results: The knockout of a single CPB gene allele through the HR method or the complete knockout of all alleles through the CRISPR method led to cell death. This outcome suggests that even the deletion of a single CPB gene allele diminishes the protein to a level insufficient for the survival of I.L.L, indicating a critical dependency on the presence of this protein for the organism's viability. rhFVII exhibited a greater expression yield with the pLEXSY construct compared to the pF7cmvneo construct in I.L.L. The lower expression rate of pF7cmvneo may be influenced by epigenetic factors related to the CPC gene or the RNA polymerase used for the expression of that promoter.

Conclusion: Therefore, considering alternative integration targets for CMV-promoter-based constructs and incorporating UTR sequences of I.L.L high-expression proteins in the vector may enhance recombinant protein expression rates.

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IssueVol 19 No 2 (2024) QRcode
SectionOriginal Article(s)
DOI https://doi.org/10.18502/ijpa.v19i2.15855
Keywords
Iranian lizard leishmania Cysteine protease B Recombinant human factor VII

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1.
Abdi Ghavidel A, Bandehpour M, Noori E, Jajarmi V, Kazemi B. Comparing the Yield of Recombinant Human Factor VII Protein Expressed by the rDNA-Promoter with the CMV-Promoter in Iranian Lizard Leishmania. Iran J Parasitol. 2024;19(2):192-202.