通过KLHDC2 E3 Ubiquitin Ligase进行选择性CDK6降解
Eunhye Jeon1,2, Younghoon Kim1, Hyunwoo Ahn3
1Department of Biomedical Sciences, Graduate School of Medical Science, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
Journal of medicinal chemistry
|December 2, 2025
概括
研究人员开发了针对KLHDC2的新型小分子配体,以创建有选择性的CDK6降解剂. 降解剂48a有效地降低了白血病细胞和瘤中的CDK6,显示了针对向蛋白质降解的治疗潜力.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 药理学 药理学是指药理学的学科.
背景情况:
- 循环素依赖性激酶6 (CDK6) 是细胞循环进展的关键调节剂.
- CDK6的失调与各种癌症有关,包括白血病.
- 有针对性的蛋白质降解为抑制蛋白质功能提供了一个新的治疗策略.
研究的目的:
- 为 KLHDC2.2 发现新的小分子配体.
- 开发对CDK6.6具有选择性的KLHDC2-介导降解剂.
- 在临床前模型中评估这些降解剂的疗效和选择性.
主要方法:
- 对KLHDC2连接体进行高通量选.
- 合成和优化KLHDC2介导的降解剂.
- 在体外以细胞为基础的对CDK6降解,细胞循环停止和细胞亡的测试.
- 蛋白质基因分析,以评估选择性.
- 使用异种移植模型进行体内研究.
主要成果:
- 确定了新的KLHDC2连接体.
- 降解剂48a在MOLM-14细胞中显示出强大而选择性的CDK6降解 (DC50=0.037μM) 超过CDK4 (DC50>10μM).
- 48a诱导G0/G1细胞周期停止和细胞亡,抑制下游信号传递.
- 与palbociclib相比,48a在白血病细胞中表现出优异的生长抑制和有利的微体稳定性.
- 蛋白质组分析证实了选择性的CDK6降解,对其他CDK的影响最小.
- 在体内减少瘤负担和CDK6水平.
结论:
- 通过KLHDC2介导的降解剂是选择性CDK6降解的有希望的策略.
- 降解剂48a具有强大的抗白血病活性和有利的药理动力学特性.
- KLHDC2 作为一个可行的替代E3酶平台,用于向蛋白质降解.
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