Abstract: Eight naturally occurring marine-sponge derived sesquiterpenoid quinones wereevaluated as potential inhibitors of pyruvate phosphate dikinase (PPDK), a C4 plantregulatory enzyme. Of these, the hydroxyquinones ilimaquinone, ethylsmenoquinone andsmenoquinone inhibited PPDK activity with IC50’s (reported with 95% confidenceintervals) of 285.4 (256.4 – 317.7), 316.2 (279.2 – 358.1) and 556.0 (505.9 – 611.0) μM,respectively, as well as being phytotoxic to the C4 plant Digitaria ciliaris. The potentialanti-inflammatory activity of these compounds, using bee venom phospholipase A2(PLA2), was also evaluated. Ethylsmenoquinone, smenospongiarine, smenospongidine andilimaquinone inhibited PLA2 activity (% inhibition of 73.2 + 4.8 at 269 μM, 61.5 + 6.1 at242 μM, 41.0 + 0.6 at 224 μM and 36.4 + 8.2 at 279 μM, respectively). SAR analysesindicate that a hydroxyquinone functionality and a short, hydroxide/alkoxide side-chain atC-20 is preferred for inhibition of PPDK activity, and that a larger amine side-chain at C-20 is tolerated for PLA2 inhibitory activity.
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Motti, C.A.; Bourguet-Kondracki, M.-L.; Longeon, A.; Doyle, J.R.; Llewellyn, L.E.; Tapiolas, D.M.; Yin, P. Comparison of the Biological Properties of Several Marine Sponge-Derived Sesquiterpenoid Quinones. Molecules 2007, 12, 1376-1388.
Motti CA, Bourguet-Kondracki M-L, Longeon A, Doyle JR, Llewellyn LE, Tapiolas DM, Yin P. Comparison of the Biological Properties of Several Marine Sponge-Derived Sesquiterpenoid Quinones. Molecules. 2007; 12(7):1376-1388.
Motti, Cherie A.; Bourguet-Kondracki, Marie-Lise; Longeon, Arlette; Doyle, Jason R.; Llewellyn, Lyndon E.; Tapiolas, Dianne M.; Yin, Ping. 2007. "Comparison of the Biological Properties of Several Marine Sponge-Derived Sesquiterpenoid Quinones." Molecules 12, no. 7: 1376-1388.