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Structure-Based Engineering of Irreversible Inhibitors against Histone Lysine Demethylase KDM5A

Journal Article · · Journal of Medicinal Chemistry
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  1. The Univ. of Texas MD Anderson Cancer Center, Houston, TX (United States); Emory Univ. School of Medicine, Atlanta, GA (United States)
  2. The Univ. of Texas MD Anderson Cancer Center, Houston, TX (United States)
  3. Emory Univ. School of Medicine, Atlanta, GA (United States)
  4. National Inst. of Health, Rockville, MD (United States). National Center for Advancing Translational Sciences
  5. Emory Univ., Atlanta, GA (United States)
The active sites of hundreds of human α-ketoglutarate (αKG) and Fe(II)-dependent dioxygenases are exceedingly well preserved, which challenges the design of selective inhibitors. In this work we identified a noncatalytic cysteine (Cys481 in KDM5A) near the active sites of KDM5 histone H3 lysine 4 demethylases, which is absent in other histone demethylase families, that could be explored for interaction with the cysteine-reactive electrophile acrylamide. We synthesized analogs of a thienopyridine-based inhibitor chemotype, namely, 2-((3-aminophenyl)(2-(piperidin-1-yl)ethoxy)methyl)thieno[3,2-b]- pyridine-7-carboxylic acid (N70) and a derivative containing a (dimethylamino)but-2-enamido)phenyl moiety (N71) designed to form a covalent interaction with Cys481. We characterized the inhibitory and binding activities against KDM5A and determined the cocrystal structures of the catalytic domain of KDM5A in complex with N70 and N71. Whereas the noncovalent inhibitor N70 displayed αKG-competitive inhibition that could be reversed after dialysis, inhibition by N71 was dependent on enzyme concentration and persisted even after dialysis, consistent with covalent modification.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
Cancer Prevention Research Institute of Texas (CPRIT); National Cancer Institute (NCI); National Institutes of Health (NIH)
OSTI ID:
1506493
Journal Information:
Journal of Medicinal Chemistry, Journal Name: Journal of Medicinal Chemistry Journal Issue: 23 Vol. 61; ISSN 0022-2623
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH

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