期刊
ACS CHEMICAL BIOLOGY
卷 11, 期 8, 页码 2328-2336出版社
AMER CHEMICAL SOC
DOI: 10.1021/acschembio.5b00924
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资金
- Scripps Institution of Oceanography
- UCSD Academic Senate [RN143S-HUGHES]
- Hellman Foundation
- SIO as part of The Training Program in Marine Biotechnology [2T32GM067550-10, NIH GM067550]
- Deutsche Forschungsgemeinschaft [RE 3704/1-1]
- Office of Science of the U.S. Department of Energy [DE-AC02-05H11231]
New methods are urgently needed to find novel natural products as structural leads for the development of new drugs against emerging diseases such as cancer and multiresistant bacterial infections. Here we introduce a reactivity-guided drug discovery approach for electrophilic natural products, a therapeutically relevant class of natural products that covalently modify their cellular targets, in crude extracts. Using carefully designed halogenated aromatic reagents, the process furnishes derivatives that are UV-active and highly conspicuous via mass spectrometry by virtue of an isotopically unique bromine or chlorine tag. In addition to the identification of high-value metabolites, the process facilitates the difficult task of structure elucidation by providing derivatives that are primed for X-ray crystallographic analysis. We show that a cysteine probe efficiently and chemoselectively labels enone-, beta-lactam-, and beta-lactone-based electrophilic natural products (parthenolide, andrographolide, wortmannin, penicillin G, salinosporamide), while a thiophenol probe preferentially labels epoxide-based electrophilic natural products (triptolide, epoxomicin, eponemycin, cyclomarin, salinamide). Using the optimized method, we were able to detect and isolate the epoxide-bearing natural product tirandalydigin from Salinispora and thereby link an orphan gene cluster to its gene product.
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