LAT Transport Inhibitors from Pittosporum venulosum Identified by NMR Fingerprint Analysis

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Abstract

1 H NMR fingerprints were used as the guiding principle for the isolation of minor compounds related to the l-type amino acid transporter inhibitors venulosides A (1) and B (2). Two new monoterpene glycosides, namely, venulosides C (3) and D (4), were isolated from a Queensland collection of the plant Pittosporum venulosum. Compounds 3 and 4 were found to inhibit l-leucine transport in LNCaP cells with IC 50 values of 11.47 and 39.73 μM, respectively. The venulosides are the first reported natural product inhibitors of leucine transport in prostate cancer cells, and the isolation of the minor compounds provides some early SAR information.

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Grkovic, T., Pouwer, R. H., Wang, Q., Guymer, G. P., Holst, J., & Quinn, R. J. (2015). LAT Transport Inhibitors from Pittosporum venulosum Identified by NMR Fingerprint Analysis. Journal of Natural Products, 78(6), 1215–1220. https://doi.org/10.1021/np500968t

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