Insight into antistaphylococcal effect of chlorinated 1-hydroxynaphthalene-2-carboxanilides
Lucia Vrablova1, Tomas Gonec2, Petra Majerova3
1Department of Analytical Chemistry, Faculty of Natural Sciences, Comenius University, Ilkovicova 6, 842 15 Bratislava, Slovakia.
ADMET & DMPK
|May 2, 2025
Summary
A novel dichlorinated hydroxynaphthalene carboxanilide compound (10) shows potent antistaphylococcal activity, including against methicillin-resistant strains. Its antibacterial effect stems from protein downregulation, not energy metabolism inhibition, with no observed cytotoxicity.
Area of Science:
- Medicinal Chemistry
- Antimicrobial Resistance
- Drug Discovery
Background:
- Antimicrobial resistance (AMR) is a critical global health challenge requiring novel therapeutic strategies.
- Developing new compounds and innovative treatments is essential to combat resistant bacterial infections.
Purpose of the Study:
- To design and synthesize novel chlorinated 1-hydroxynaphthalene-2-carboxanilides as potential multitarget antimicrobial agents.
- To evaluate the antistaphylococcal activity and cytotoxicity of these newly synthesized compounds.
Main Methods:
- Synthesis of twelve mono-, di-, and trichlorinated 1-hydroxynaphthalene-2-carboxanilides.
- Antistaphylococcal activity testing using minimum inhibitory concentration (MIC) assays.
- Cytotoxicity assessment via MTT assay and chemoproteomic analysis.
Main Results:
- Compound 10, N-(3,5-Dichlorophenyl)-1-hydroxynaphthalene-2-carboxamide, exhibited potent antistaphylococcal activity (MIC = 0.37 μM), effective against methicillin-resistant Staphylococcus aureus (MRSA).
- Compound 10 demonstrated no significant inhibition of bacterial respiration at 16x MIC and showed no in vitro cytotoxicity up to 30 μM.
- Chemoproteomic analysis indicated that compound 10 downregulates essential bacterial proteins, including the ATP-dependent protease ATPase subunit HslU.
Conclusions:
- The position of chlorine substituents is crucial for antistaphylococcal efficacy.
- Compound 10's antibacterial mechanism involves the downregulation of key bacterial proteins essential for survival and growth, rather than direct inhibition of energy metabolism.
- The promising efficacy and safety profile of compound 10 warrant further investigation as a potential therapeutic agent against Staphylococcus aureus infections.
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