The cfr and cfr-like multiple resistance genes

Area of Science:

• Microbiology
• Molecular Biology
• Antimicrobial Resistance

Background:

• The Cfr methyltransferase enzyme modifies bacterial ribosomes.
• This modification impedes the binding of numerous antibiotics that target the peptidyl transferase center.
• This confers multi-drug resistance to eight classes of clinically and veterinarily important antibiotics.

Purpose of the Study:

• To investigate the mechanism of antibiotic resistance conferred by the Cfr methyltransferase.
• To understand the prevalence and distribution of the cfr gene in various bacterial species and environments.

Main Methods:

• Analysis of RNA methylation in bacterial ribosomes.
• Investigation of antibiotic binding assays.
• Molecular detection and characterization of the cfr gene in bacterial isolates from diverse geographical locations, including clinical, veterinary, and environmental samples (harbors, food markets).

Main Results:

• The Cfr enzyme's RNA methylation activity was confirmed to inhibit antibiotic binding.
• The cfr gene confers resistance to eight classes of antibiotics, including those in clinical use.
• The cfr gene is widespread across various bacterial species and geographical locations, found on plasmids and transposons.
• Cfr-related resistance genes have been identified in pathogens like Clostridium difficile and Enterococcus faecium.
• The cfr gene has been detected in environmental samples such as harbors and food markets.

Conclusions:

• The Cfr methyltransferase is a significant mechanism for bacterial multi-drug resistance.
• The widespread presence of the cfr gene in clinical, veterinary, and environmental settings highlights a substantial public health concern.
• The identification of cfr genes in pathogens and environmental niches necessitates ongoing surveillance and the development of novel therapeutic strategies.