Bioactive principles in the bark of Pilidiostigma tropicum

Journal Publication ResearchOnline@JCU
Setzer, William N.;Rozmus, Glenn F.;Setzer, Mary C.;Schmidt, Jennifer M.;Vogler, Bernhard;Reeb, Sabine;Jackes, Betsy R.;Irvine, Anthony K.
Betsy Jackes
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.

Journal

Journal of Molecular Modeling

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N/A

Volume

12

ISBN/ISSN

0948-5023

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Issue

5

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Publisher

Springer

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Publisher Location

New York, USA -NY

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N/A

DOI

10.1007/s00894-005-0047-1