Synthesis, biological activity and tubulin binding poses of 1-deoxy-9-(R)-dihydrotaxane analogs

1-Deoxy-9α-dihydrotaxane analogs 9 and 10 were semi-synthesized from 1-deoxybaccatin VI, isolated from Taxus mairei, and tested for cytotoxic activity. Taxane 9 is 10-fold less cytotoxic than paclitaxel, while 10 is equally active. In the tubulin polymerization assay (ED50 values), 10 is 4-fold less effective than paclitaxel, but 3-fold superior to 9. These observations can be explained by analysis of the corresponding taxane/β-tubulin complexes.

Graphical abstract1-Deoxy-9α-dihydrotaxane analogs 9 and 10 were semi-synthesized from 1-deoxybaccatin VI, isolated from Taxus mairei, and tested for cytotoxic activity. Taxane 9 is 10-fold less cytotoxic than paclitaxel, while 10 is equally active. In the tubulin polymerization assay (ED50 values), 10 is 4-fold less effective than paclitaxel, but 3-fold superior to 9. These observations can be explained by analysis of the corresponding taxane/β-tubulin complexes.Figure optionsDownload full-size imageDownload as PowerPoint slide