M. tuberculosis ferritin (Rv3841): Potential involvement in Amikacin (AK) & Kanamycin (KM) resistance

Area of Science:

• Microbiology
• Molecular Biology
• Drug Resistance

Background:

• Tuberculosis (TB) is an infectious disease caused by Mycobacterium tuberculosis.
• Aminoglycosides like Amikacin (AK) and Kanamycin (KM) are used for drug-resistant TB, targeting protein synthesis.
• Mechanisms of aminoglycoside resistance are not fully understood, but iron-interacting proteins are overexpressed in resistant strains.

Purpose of the Study:

• To investigate the relationship between ferritin (Rv3841/bfrB) and resistance to Amikacin (AK) and Kanamycin (KM) in Mycobacterium tuberculosis.
• To determine if ferritin overexpression influences the efficacy of these aminoglycoside antibiotics.

Main Methods:

• The Rv3841/bfrB gene was cloned and expressed in E. coli BL21 using the pQE2 expression vector.
• Antimicrobial drug susceptibility testing (DST) was performed using Etest to determine minimum inhibitory concentrations (MICs).
• STRING analysis was used to predict protein-protein interactions involving ferritin.

Main Results:

• Overexpression of ferritin in recombinant E. coli cells resulted in a two-fold increase in MIC for Amikacin and a three-fold increase for Kanamycin.
• These changes in MIC suggest that ferritin influences bacterial susceptibility to AK and KM.
• STRING analysis indicated potential interactions between ferritin and proteins involved in iron assimilation, virulence, and stress response in M. tuberculosis.

Conclusions:

• Ferritin overexpression is associated with increased resistance to Amikacin and Kanamycin in Mycobacterium tuberculosis.
• Ferritin may play a critical role in mycobacterial survival by modulating the effects of these aminoglycoside antibiotics.
• Further research into ferritin's interactions could reveal new targets for combating drug-resistant tuberculosis.