A structure-based virtual screening approach toward the discovery of histone deacetylase inhibitors: identification of promising zinc-chelating groups.
The inhibitors of histone deacetylases (HDACs) have drawn a great deal of attention due to their promising potential as small-molecule therapeutics for the treatment of cancer. By means of virtual screening with docking simulations under consideration of the effects of ligand solvation, we were able to identify six novel HDAC inhibitors with IC(50) values ranging from 1 to 100 muM. These newly identified inhibitors are structurally diverse and have various chelating groups for the active site zinc ion, including N-[1,3,4]thiadiazol-2-yl sulfonamide, N-thiazol-2-yl sulfonamide, and hydroxamic acid moieties. The former two groups are included in many drugs in current clinical use and have not yet been reported as HDAC inhibitors. Therefore, they can be considered as new inhibitor scaffolds for the development of anticancer drugs by structure-activity relationship studies to improve the inhibitory activities against HDACs. Interactions with the HDAC1 active site residues responsible for stabilizing these new inhibitors are addressed in detail.
Department of Bioscience and Biotechnology, Sejong University, 98 Kunja-dong, Kwangjin-ku, Seoul 143-747, Korea. hspark@sejong.ac.kr
Hwangseo
H
Park
Sukyoung
S
Kim
Yong Eun
YE
Kim
Soo-Jeong
SJ
Lim
D000970:Antineoplastic Agents / Q000737:chemistry* / Q000494:pharmacology; D001665:Binding Sites; D020134:Catalytic Domain; D002614:Chelating Agents / Q000737:chemistry*; D003198:Computer Simulation; D055808:Drug Discovery; D056572:Histone Deacetylase Inhibitors / Q000737:chemistry* / Q000494:pharmacology; D006655:Histone Deacetylases / Q000737:chemistry* / Q000378:metabolism; D006877:Hydroxamic Acids / Q000737:chemistry / Q000494:pharmacology; D013329:Structure-Activity Relationship; D013449:Sulfonamides / Q000737:chemistry / Q000494:pharmacology; D015032:Zinc / Q000737:chemistry*
D000970:Antineoplastic Agents; D002614:Chelating Agents; D056572:Histone Deacetylase Inhibitors; D006877:Hydroxamic Acids; D013449:Sulfonamides; D006655:Histone Deacetylases; D015032:Zinc