Abstract:
:Increased usage of daptomycin to treat infections caused by Gram-positive bacterial pathogens has resulted in emergence of resistant mutants. In a search for more effective daptomycin analogues through medicinal chemistry studies, we found that methylation at the nonproteinogenic amino acid kynurenine in daptomycin could result in significant enhancement of antibacterial activity. Termed "kynomycin," this new antibiotic exhibits higher antibacterial activity than daptomycin and is able to eradicate methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant Enterococcus (VRE) strains, including daptomycin-resistant strains. The improved antimicrobial activity of kynomycin was demonstrated in in vitro time-killing assay, in vivo wax worm model, and different mouse infection models. The increased antibacterial activity, improved pharmacokinetics, and lower cytotoxicity of kynomycin, compared to daptomycin, showed the promise of the future design and development of next-generation daptomycin-based antibiotics.
journal_name
J Med Chemjournal_title
Journal of medicinal chemistryauthors
Chow HY,Po KHL,Gao P,Blasco P,Wang X,Li C,Ye L,Jin K,Chen K,Chan EWC,You X,Yi Tsun Kao R,Chen S,Li Xdoi
10.1021/acs.jmedchem.9b01957subject
Has Abstractpub_date
2020-03-26 00:00:00pages
3161-3171issue
6eissn
0022-2623issn
1520-4804journal_volume
63pub_type
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