Li Youxuan, Woster Patrick M
Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, Medical University of South Carolina, 70 President St., Charleston, SC 29425.
Medchemcomm. 2015 Apr 1;6(4):613-618. doi: 10.1039/C4MD00401A.
Small molecules featuring a hydroxamic acid or a benzamide zinc binding group (ZBG) are the most thoroughly studied histone deacetylase (HDAC) inhibitors. However, concerns about the pharmacokinetic liabilities of the hydroxamic acid moiety and potential metabolic toxicity of the aniline portion of benzamide HDAC inhibitors have stimulated research efforts aimed at discovering alternative ZBGs. Here we report the 2-(oxazol-2-yl)phenol moiety as a novel ZBG that can be used to produce compounds that are potent HDAC inhibitors. A series of analogues with this novel ZBG have been synthesized, and these analogues exhibit selective inhibition against HDAC1 as well as the class IIb HDACs (HDAC6 and HDAC10). Compound possesses an IC value of 7.5 μM in the MV-4-11 leukemia cell line, and induces a comparable amount of acetylated histone 3 lysine 9 (H3K9) and p21Waf1/CIP1 as 0.5 μM of SAHA. Modeling of compound in the active site of HDAC2 demonstrates that the 2-(oxazol-2-yl)phenol moiety has a zinc-binding pattern similar to benzamide HDAC inhibitors.
具有异羟肟酸或苯甲酰胺锌结合基团(ZBG)的小分子是研究最为深入的组蛋白去乙酰化酶(HDAC)抑制剂。然而,对异羟肟酸部分的药代动力学缺陷以及苯甲酰胺HDAC抑制剂苯胺部分潜在代谢毒性的担忧促使人们开展研究以寻找替代的ZBG。在此,我们报道2-(恶唑-2-基)苯酚部分作为一种新型ZBG,可用于制备强效HDAC抑制剂化合物。已合成了一系列具有这种新型ZBG的类似物,这些类似物对HDAC1以及IIb类HDAC(HDAC6和HDAC10)表现出选择性抑制作用。化合物在MV-4-11白血病细胞系中的IC值为7.5 μM,诱导的乙酰化组蛋白3赖氨酸9(H3K9)和p21Waf1/CIP1量与0.5 μM的SAHA相当。化合物在HDAC2活性位点的建模表明,2-(恶唑-2-基)苯酚部分具有与苯甲酰胺HDAC抑制剂相似的锌结合模式。