Molecular Biotechnology

, Volume 61, Issue 1, pp 12–19 | Cite as

Effect of C-Terminus Modification in Salmonella typhimurium FliC on Protein Purification Efficacy and Bioactivity

  • Mohammad-hosein Khani
  • Masoumeh BagheriEmail author
  • Ali Dehghanian
  • Azadeh Zahmatkesh
  • Soheila Moradi Bidhendi
  • Zahra Salehi Najafabadi
  • Reza Banihashemi
Original Paper


Recombinant flagellin (FliC) has shown low efficacy in purification because of inclusion bodies formation and aggregation. We hypothesized preserving TLR5 binding site of FliC and removing some amino acids could be responsible for aggregation and solubility improvement. Hence, a bioinformatics study was performed to find hotspots in aggregate formation. Protein modeling was carried out by SWISS-MODEL and I-TASSER servers and models were compared by MATRAS server and Chimera 1.11.2. Gene modification was carried out based on bioinformatics studies. Genes, (truncated modified fliC (tmFliC) and full-length fliC (flFliC)), were cloned and expressed in pET-21a vector. Protein purification was carried out using HIS-Tag method. Proliferation assay and also induction of IL-8 in HEK293 cells were performed to confirm bioactivity function of tmFliC. Bioinformatics results showed that partial deletion of C-terminus may increase solubility without unfavorable effect on TLR5 recognition. Also, model comparison showed that this protein may preserve 3D structure. In addition, GlobPlot server demonstrated that tmFliC formed its globular domains which were important in TLR5 recognition. As we expected, high purification efficacy for tmFliC compared with flFliC was also obtained in experimental studies and a proper function for tmFliC was observed. The tmFliC enhanced cell proliferation in HEK293 cells compare with control after 24 h. Also, IL-8 level was increased with stimulation by tmFliC after 24 h. In conclusion, reducing hydrophobicity in C-terminus and deleting necessary amino acids for filament formation may increase protein solubility.


Flagellin Protein modeling Purification efficacy Proliferation Bioinformatics 



The authors would like to show their gratitude to Dr. Majid Esmaelizad from Razi Vaccine and Serum Research Institute.

Compliance with Ethical Standards

Conflict of interest

The authors confirm that they have no conflicts of interest.


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Mohammad-hosein Khani
    • 1
  • Masoumeh Bagheri
    • 1
    Email author
  • Ali Dehghanian
    • 2
  • Azadeh Zahmatkesh
    • 1
  • Soheila Moradi Bidhendi
    • 3
  • Zahra Salehi Najafabadi
    • 4
  • Reza Banihashemi
    • 5
  1. 1.Department of Genomics and Genetic EngineeringRazi Vaccine and Serum Research Institute (RVSRI), Agricultural Research, Education and Extension Organization (AREEO)KarajIran
  2. 2.Department of BiologyNourdanesh Institute of Higher EducationMeymehIran
  3. 3.Department of MicrobiologyRazi Vaccine and Serum Research Institute (RVSRI), Agricultural Research, Education and Extension Organization (AREEO)KarajIran
  4. 4.Department of Central LaboratoryRazi Vaccine and Serum Research Institute (RVSRI), Agricultural Research, Education and Extension Organization (AREEO)KarajIran
  5. 5.Department of ImmunologyRazi Vaccine and Serum Research Institute (RVSRI), Agricultural Research, Education and Extension Organization (AREEO)KarajIran

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