Design of peptides interfering with iron-dependent regulator (IdeR) and evaluation of Mycobacterium tuberculosis growth inhibition

Document Type : Original Article

Authors

1 Department of Microbiology and Virology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran

2 Antimicrobial Resistance Research Center, Avicenna Research Institute, Mashhad University of Medical Sciences, Mashhad, Iran

3 Tuberculosis Reference Center, Dr Shariati Hospital, Mashhad University of Medical Sciences, Mashhad, Iran

4 Department of Laboratory Sciences, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad

Abstract

Objective(s): Tuberculosis (TB), a disease caused by Mycobacterium tuberculosis (Mtb), stayed a global health thread with high mortality rate. Since TB has a long-term treatment, it leads high risk of drug resistant development, and there is an urgent to find new drugs. The aim of this study was designing new inhibitors for a new drug target, iron dependent regulator, IdeR.
Materials and Methods: Based on the interaction most populated amino acids of IdeR to the related gene operators, 50 short peptides were modeled. Bonding affinity of short peptides toward DNA were studied by docking. Top 10 best predicted bonding affinity were selected. DNA binding assay, microplate alamar blue assay, colony counting, quantitative real time- PCR (qRT-PCR) of IdeR corresponding genes, cell wall-associated mycobactin and whole-cell iron estimation were done to prove the predicted mechanism of in silico potent constructs.
Results: Amongst the 10 synthesized short peptide candidates, glycine-valine-proline-glycine (GVPG) and arginine-proline-arginine (RPR) inhibited Mtb in vitro at 200 µM concentration. qRT-PCR showed mbtB 58-fold over expression that resulted in Mtb growth inhibition. Cell wall-associated mycobactin and whole-cell iron estimation confirmed the results of qRT-PCR.
Conclusion: We introduced two new lead compounds to inhibit Mtb that are promising for the development of more potent anti-tubercular therapies.

Keywords

References

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Iranian Journal of Basic Medical Sciences
Volume 20, Issue 6
June 2017
Pages 722-728

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