Researchers report a synthetic antimicrobial peptide named RK-14 that killed methicillin-resistant Staphylococcus aureus (MRSA) and multidrug-resistant Escherichia coli strains isolated from poultry in laboratory tests. It also cleared mature biofilms from pieces of medical-grade silicone catheter, according to Indian news coverage on 31 October.
The peptide was designed with artificial intelligence and machine learning. All the results so far come from laboratory experiments.
How it was designed
The team generated and screened thousands of virtual peptide candidates, tuning properties such as electrical charge, hydrophobicity and structural stability, then picked RK-14 as the lead and made it in the laboratory.
Natural antimicrobial peptides often struggle with stability, production cost, toxicity and breakdown in blood serum. The researchers designed RK-14 to avoid some of those problems.
What the tests showed
RK-14 killed MRSA and the multidrug-resistant poultry E. coli. On silicone catheter segments carrying biofilms grown for five days, it cleared the biofilm better than the conventional antibiotics it was compared with. Biofilms are protective layers of bacteria that make infections on medical devices hard to treat. The study also found that RK-14 suppressed genes linked to quorum sensing, virulence and biofilm formation.
Toxicity to mammalian cells was low at effective doses, but red blood cell damage, called hemolysis, rose at higher doses. The peptide was stable to heat and salt under several tested conditions, though heating to 100 degrees Celsius and prolonged exposure to high serum levels reduced its activity.
What is still unknown
The coverage describes no animal or human testing. Whether RK-14 would work and remain safe inside the body, and how bacteria might adapt to it, is not known.
OrientSciences worked from news coverage of the paper, titled RK-14: A Novel Antimicrobial Peptide Targeting Multidrug-Resistant Bacteria and Catheter-Associated Biofilms, and did not read it. The journal and publication date are not confirmed here.