PRMT3 catalyzes the asymmetric dimethylation of arginine residues of various proteins. It is crucial for maturation of ribosomes and has been implicated in several diseases. We recently disclosed a highly potent, selective, and cell-active allosteric inhibitor of PRMT3, compound 4. Here, we report comprehensive structure-activity relationship studies that target the allosteric binding site of PRMT3. We conducted design, synthesis, and evaluation of novel compounds in biochemical, selectivity, and cellular assays that culminated in the discovery of 4 and other highly potent (IC50 values: ∼10-36 nM), selective, and cell-active allosteric inhibitors of PRMT3 (compounds 29, 30, 36, and 37). In addition, we generated compounds that are very close analogs of these potent inhibitors but displayed drastically reduced potency as negative controls (compounds 49-51). These inhibitors and negative controls are valuable chemical tools for the biomedical community to further investigate biological functions and disease associations of PRMT3.

中文翻译：

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发现精氨酸甲基转移酶3（PRMT3）的有效和选择性变构抑制剂。

PRMT3催化各种蛋白质精氨酸残基的不对称二甲基化。它对于核糖体的成熟至关重要，并且与多种疾病有关。我们最近公开了PRMT3化合物4的高效，选择性和细胞活性变构抑制剂。在这里，我们报道了针对PRMT3变构结合位点的全面的构效关系研究。我们在生化，选择性和细胞分析中进行了新化合物的设计，合成和评估，最终发现了4种和其他高效（IC50值：〜10-36 nM），选择性和细胞活性的变构抑制剂。 PRMT3（化合物29、30、36和37）。此外，我们生成了与这些有效抑制剂非常相似的化合物，但它们作为阴性对照的效力却大大降低了（化合物49-51）。这些抑制剂和阴性对照是生物医学界进一步研究PRMT​​3的生物学功能和疾病关联的有价值的化学工具。