Sulfonyl fluoride EM12-SF was developed previously to covalently engage a histidine residue in the sensor loop of cereblon (CRBN) in the E3 ubiquitin ligase complex CRL4^CRBN. Here, we further develop the structure–activity relationships of additional sulfonyl fluoride containing ligands that possess a range of cereblon binding potencies in cells. Isoindoline EM364-SF, which lacks a key hydrogen bond acceptor present in CRBN molecular glues, was identified as a potent binder of CRBN. This led to the development of the reversible molecular glue CPD-2743, that retained cell-based binding affinity for CRBN and degraded the neosubstrate IKZF1 to the same extent as EM12, but unlike isoindolinones, lacked SALL4 degradation activity (a target linked to teratogenicity). CPD-2743 had high permeability and lacked efflux in Caco-2 cells, in contrast to the isoindolinone iberdomide. Our methodology expands the repertoire of sulfonyl exchange chemical biology via the advancement of medicinal chemistry design strategies.

中文翻译：

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开发磺酰氟化学探针以推进 cereblon 调节剂的发现

磺酰氟 EM12-SF 之前开发用于与 E3 泛素连接酶复合物 CRL4 ^CRBN中的 cereblon 传感器环 (CRBN) 中的组氨酸残基共价结合。在这里，我们进一步开发了额外的含有磺酰氟的配体的结构-活性关系，这些配体在细胞中具有一系列的 cereblon 结合能力。异吲哚啉 EM364-SF 缺乏 CRBN 分子胶中存在的关键氢键受体，被认为是 CRBN 的有效粘合剂。这导致了可逆分子胶 CPD-2743 的开发，它保留了对 CRBN 的细胞结合亲和力，并将新底物 IKZF1 降解到与 EM12 相同的程度，但与异吲哚啉酮不同，它缺乏 SALL4 降解活性（与致畸性相关的目标） 。与异吲哚酮伊贝多胺相比，CPD-2743 在 Caco-2 细胞中具有高渗透性且缺乏外排。我们的方法通过药物化学设计策略的进步扩展了磺酰交换化学生物学的库。