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Unveiling the mechanism of action of 7α-acetoxy-6β-hydroxyroyleanone on an mrsa/visa strain: Membrane and cell wall interactions
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Orientador(es)
Resumo(s)
The number of cases of failure in the treatment of infections associated with resistant bacteria is on the rise, due to the decreasing efficacy of current antibiotics. Notably, 7α-Acetoxy-6β-hydroxyroyleanone (AHR), a diterpene isolated from different Plectranthus species, showed antibacterial activity, namely against Methicillin-resistant Staphylococcus aureus (MRSA) strains. The high antibacterial activity and low cytotoxicity render this natural compound an interesting alternative against resistant bacteria. The aim of this study is to understand the mechanism of action of AHR on MRSA, using the MRSA/Vancomycin-intermediate S. aureus (VISA) strain CIP 106760, and to study the AHR effect on lipid bilayers and on the cell wall. Although AHR interacted with lipid bilayers, it did not have a significant effect on membrane passive permeability. Alternatively, bacteria treated with this royleanone displayed cell wall disruption, without revealing cell lysis. In conclusion, the results gathered so far point to a yet undescribed mode of action that needs further investigation.
Descrição
UIDB/00100/2020
PTDC/MED-QUI/29036/2017
CEECIND/03414/2018
UIDB/04378/2020
PTDC/BIA-MIC/31645/2017
UID/DTP/04138/2019
UID/DTP/04567/2019
CBIOS/PRUID/BI1/2017
UIDB/04567/2020
UID/AMB/50017
UIDP/50017/2020
UIDB/50017/2020
Palavras-chave
7α-Acetoxy-6β-hydroxyroyleanone Antibacterial activity Cell wall MRSA Membrane interaction Biochemistry Molecular Biology