Osman, Khadijo and Evangelopoulos, Dimitrios and Basavannacharya, Chandrakala and Gupta, Antima and McHugh, T.D. and Bhakta, Sanjib and Gibbons, S. (2011) An antibacterial from Hypericum acmosepalum inhibits ATP-dependent MurE ligase from Mycobacterium tuberculosis. International Journal of Antimicrobial Agents 39 (2), pp. 124-129. ISSN 0924-8579.Full text not available from this repository.
In a project to characterise new antibacterial chemotypes from plants, hyperenone A and hypercalin B were isolated from the hexane and chloroform extracts of the aerial parts of Hypericum acmosepalum. The structures of both compounds were characterised by extensive one- and two-dimensional nuclear magnetic resonance (NMR) spectroscopy and were confirmed by mass spectrometry. Hyperenone A and hypercalin B exhibited antibacterial activity against multidrug-resistant strains of Staphylococcus aureus, with minimum inhibition concentration ranges of 2–128 mg/L and 0.5–128 mg/L, respectively. Hyperenone A also showed growth-inhibitory activity against Mycobacterium tuberculosis H37Rv and Mycobacterium bovis BCG at 75 mg/L and 100 mg/L. Neither hyperenone A nor hypercalin B inhibited the growth of Escherichia coli and both were non-toxic to cultured mammalian macrophage cells. Both compounds were tested for their ability to inhibit the ATP-dependent MurE ligase of M. tuberculosis, a crucial enzyme in the cytoplasmic steps of peptidoglycan biosynthesis. Hyperenone A inhibited MurE selectively, whereas hypercalin B did not have any effect on enzyme activity.
|Additional Information:||*Undergrad, left Bbk in 2008|
|Keyword(s) / Subject(s):||Hypericum acmosepalum, Hyperenone A, Hypercalin B, Staphylococcus aureus, Tuberculosis, Peptidoglycan, MurE ligase|
|School or Research Centre:||Birkbeck Schools and Research Centres > School of Science > Biological Sciences|
|Date Deposited:||14 Nov 2011 08:27|
|Last Modified:||17 Apr 2013 12:21|
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