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Updated: Apr 18, 2026

A Semi-Quantitative Drug Affinity Responsive Target Stability DARTS assay for studying Rapamycin/mTOR interaction
Published on: August 27, 2019
Drug affinity responsive target stability (DARTS) for small-molecule target identification
Melody Y Pai1, Brett Lomenick, Heejun Hwang
1Molecular Biology Institute, University of California Los Angeles, Los Angeles, CA, USA.
Abstract:
Drug affinity responsive target stability (DARTS) is a relatively quick and straightforward approach to identify potential protein targets for small molecules. It relies on the protection against proteolysis conferred on the target protein by interaction with a small molecule. The greatest advantage of this method is being able to use the native small molecule without having to immobilize or modify it (e.g., by incorporation of biotin, fluorescent, radioisotope, or photoaffinity labels). Here we describe in detail the protocol for performing unbiased DARTS with complex protein lysates to identify binding targets of small molecules and for using DARTS-Western blotting to test, screen, or validate potential small-molecule targets. Although the ideas have mainly been developed from studying molecules in areas of biology that are currently of interest to us and our collaborators, the general principles should be applicable to the analysis of all molecules in nature.
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