Design of a PEGylated Antimicrobial Prodrug with Species-Specific Activation.
Biomacromolecules
; 22(2): 984-992, 2021 02 08.
Article
in En
| MEDLINE
| ID: mdl-33428376
ABSTRACT
The rise of multidrug-resistant (MDR) "superbugs" has created an urgent need to develop new classes of antimicrobial agents to target these organisms. Oligothioetheramides (oligoTEAs) are a unique class of antimicrobial peptide (AMP) mimetics with one promising compound, BDT-4G, displaying potent activity against MDR Pseudomonas aeruginosa clinical isolates. Despite widely demonstrated potency, BDT-4G and other AMP mimetics have yet to enjoy broad preclinical success against systemic infections, primarily due to their cytotoxicity. In this work, we explore a prodrug strategy to render BDT-4G inactive until it is exposed to an enzyme secreted by the targeted bacteria. The prodrug consists of polyethylene glycol (PEG) conjugated to BDT-4G by a peptide substrate. PEG serves to inactivate and reduce the toxicity of BDT-4G by masking its cationic charge and antimicrobial activity is recovered following site-specific cleavage of the short peptide linker by LasA, a virulence factor secreted by P. aeruginosa. This approach concurrently reduces cytotoxicity by greater than 1 order of magnitude in vitro and provides species specificity through the identity of the cleavable linker.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Prodrugs
/
Anti-Infective Agents
Language:
En
Journal:
Biomacromolecules
Journal subject:
BIOLOGIA MOLECULAR
Year:
2021
Document type:
Article
Affiliation country:
United States