New fluorescent benzamide derivatives were developed by using four different aromatic groups with expanding sizes from thiophene to naphthalene, anthracene, and pyrene in an attempt to identify a novel histone deacetylase (HDAC) inhibitor. The compounds exhibited red shift absorption and emission dependent on the size of the aromatic group as well as a high fluorescence efficiency with high quantum yields. However, the HDAC binding affinity of the compounds with polyaromatic modification of the substituent was very low (IC50
ranging from 46 to 101 μM) in contrast to that of the monoaromatic substituted compound (<0.12 μM). Likely, the modification of the aromatic substituent results in the enzyme's inability to bind the inhibitors due to space limitation at the binding site. Nevertheless, we believe that these results will be useful in the design of new fluorescent HDAC inhibitors based on the benzamide scaffold with diverse applications as diagnostic tools targeting the HDAC enzyme, which has an important role in the prevention of a number of diseases.
为了鉴定新型组蛋白去乙酰化酶(HDAC)抑制剂,我们使用了从噻吩到萘、蒽和芘的四种不同大小的芳香基团,开发了新型荧光苯甲酰胺衍生物。这些化合物表现出与芳香基团大小相关的红移吸收和发射,以及高量子产率的高荧光效率。然而,取代基经过多芳香族修饰的化合物的 HDAC 结合亲和力非常低(IC50
为 46 至 101 μM),与单芳香族取代基化合物的结合亲和力(0.12 μM)形成鲜明对比。芳香取代基的修饰可能导致酶因结合位点的空间限制而无法与抑制剂结合。尽管如此,我们相信这些结果将有助于设计基于苯甲酰胺支架的新型荧光 HDAC 抑制剂,这些抑制剂可作为针对 HDAC 酶的诊断工具,在多种疾病的预防中发挥重要作用。