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PAINS: Relevance to Tool Compound Discovery and Fragment-Based Screening

Jonathan B. Baell A E , Lori Ferrins A , Hendrik Falk B C D and George Nikolakopoulos B C D
+ Author Affiliations
- Author Affiliations

A Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus), 381 Royal Parade, Parkville, Vic. 3052, Australia.

B The Walter and Eliza Hall Institute of Medical Research, Parkville, Vic. 3052, Australia.

C Department of Medical Biology, University of Melbourne, Parkville, Vic. 3052, Australia.

D Cancer Therapeutics CRC, Bundoora, Vic. 3083, Australia.

E Corresponding author. Email: Jonathan.Baell@monash.edu

Australian Journal of Chemistry 66(12) 1483-1494 https://doi.org/10.1071/CH13551
Submitted: 14 October 2013  Accepted: 11 November 2013   Published: 2 December 2013

Abstract

Pan assay interference compounds (PAINS) are readily discovered in any bioassay and can appear to give selective and optimisable hits. The most common PAINS can be readily recognised by their structure. However, there are compounds that closely resemble PAINS that are not specifically recognised by the PAINS filters. In addition, highly reactive compounds are not encoded for in the PAINS filters because they were excluded from the high-throughput screening (HTS) library used to develop the filters and so were never present to provide indicting data. A compounding complication in the area is that very occasionally a PAINS compound may serve as a viable starting point for progression. Despite such an occasional example, the literature is littered with an overwhelming number of examples of compounds that fail to progress and were probably not optimisable in the first place, nor useful tool compounds. Thus it is with great caution and diligence that compounds possessing a known PAINS core should be progressed through to medicinal chemistry optimisation, if at all, as the chances are very high that the hits will be found to be non-progressable, often after a significant waste of resources.


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