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Deciphering the Cellular Targets of Bioactive Compounds Using a Chloroalkane Capture Tag.

Abstract：

:Phenotypic screening of compound libraries is a significant trend in drug discovery, yet success can be hindered by difficulties in identifying the underlying cellular targets. Current approaches rely on tethering bioactive compounds to a capture tag or surface to allow selective enrichment of interacting proteins for subsequent identification by mass spectrometry. Such methods are often constrained by ineffective capture of low affinity and low abundance targets. In addition, these methods are often not compatible with living cells and therefore cannot be used to verify the pharmacological activity of the tethered compounds. We have developed a novel chloroalkane capture tag that minimally affects compound potency in cultured cells, allowing binding interactions with the targets to occur under conditions relevant to the desired cellular phenotype. Subsequent isolation of the interacting targets is achieved through rapid lysis and capture onto immobilized HaloTag protein. Exchanging the chloroalkane tag for a fluorophore, the putative targets identified by mass spectrometry can be verified for direct binding to the compound through resonance energy transfer. Using the interaction between histone deacetylases (HDACs) and the inhibitor, Vorinostat (SAHA), as a model system, we were able to identify and verify all the known HDAC targets of SAHA as well as two previously undescribed targets, ADO and CPPED1. The discovery of ADO as a target may provide mechanistic insight into a reported connection between SAHA and Huntington's disease.

journal_name

ACS Chem Biol

journal_title

ACS chemical biology

authors

Ohana RF,Kirkland TA,Woodroofe CC,Levin S,Uyeda HT,Otto P,Hurst R,Robers MB,Zimmerman K,Encell LP,Wood KV

doi

10.1021/acschembio.5b00351

subject

Has Abstract

pub_date

2015-10-16 00:00:00

pages

2316-24

issue

10

eissn

1554-8929

issn

1554-8937

journal_volume

10

pub_type

杂志文章

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