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化学蛋白组学识别了依赖状态和蛋白形选择性酶-2 抑制剂

José O Castellón¹, Samuel Ofori¹, Nikolas R Burton^1,2

¹Biological Chemistry Department, David Geffen School of Medicine, UCLA, Los Angeles, California 90095, United States.

Journal of the American Chemical Society

|May 24, 2024

概括

研究人员开发了一种选择性小分子抑制剂,其向caspase-2,这是一个关键的蛋白酶. 这些抑制剂特别向一种独特的囊残留物,使其能够精确调节酶-2活性,并揭示其在DNA损伤反应中的作用.

科学领域:

生物化学和分子生物学
化学生物学
蛋白酶抑制剂的开发

背景情况:

卡斯帕酶是关键蛋白酶,参与细胞亡,炎症和细胞增殖.
开发选择性酶抑制剂是具有挑战性的,因为在12种人类酶中具有很高的同质性.
小分子为调节酶活性提供了基因方法的替代方案.

研究的目的:

为选择性caspase-2抑制确定一个独特的目标.
开发小分子抑制剂,主要针对caspase-2.
研究不同类型的酶在细胞反应中的作用.

主要方法:

基于质谱的化学蛋白质学来识别独特的反应性囊蛋白.
基于凝的基于活性的蛋白质分析 (ABPP) 和TEV蛋白酶测定用于化合物选.
在细胞溶解物和完整细胞中进行聚焦模拟合成和化学蛋白质分析.

主要成果:

在Caspase-2中确定了一个独特的非催化性半氨酸作为目标.
开发了可选择性抑制酶-2 的共价化合物.
证明部分加工的p32形式的caspase-2驱动DNA损伤反应.

结论:

向未保存的非催化氨酸残留物可实现蛋白质形式选择性酶抑制.
开发了用于分层卡斯帕斯-2细胞原体和加工形式的工具化合物.
提供了p32形式的caspase-2调解DNA损伤反应的证据.

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