Abstract
The crude dichloromethane bark extract of Pilidiostigma tropicum (Myrtaceae) from north Queensland, Australia, shows antibacterial and cytotoxic activity. Bioactivity-directed separation led to the isolation of rhodomyrtoxin B and ursolic acid-3-p-coumarate as the biologically active materials. The structures of these compounds were elucidated on the basis of spectral analysis. The intercalation interaction of rhodomyrtoxin B with DNA was investigated using molecular mechanics and ab initio molecular-orbital techniques. A favorable π−π interaction between rhodomyrtoxin B and the cytosine–guanine base pair is predicted, but the orientation of the interaction cannot be predicted based on frontier molecular orbitals.
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Acknowledgements
Support for this research was provided in part by a grant from the National Institutes of Health (Grant No. 1 R15 AIOD39740-01). We are grateful to the Queensland Forest Service for allowing us access to the Curtain Fig State Forest. We thank Ms. Susan M. Fields for assistance with the cytotoxicity screening.
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Dedicated to Professor Dr. Paul von Ragué Schleyer on the occasion of his 75th birthday
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Setzer, W.N., Rozmus, G.F., Setzer, M.C. et al. Bioactive principles in the bark of Pilidiostigma tropicum . J Mol Model 12, 703–711 (2006). https://doi.org/10.1007/s00894-005-0047-1
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DOI: https://doi.org/10.1007/s00894-005-0047-1