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BRD4 调节了 Aurora B 激酶活性

Ballachanda N Devaiah¹, Dan Cheng¹, Amit K Singh¹

¹Experimental Immunology Branch, NCI, NIH, Bethesda, MD 20892, USA.

bioRxiv : the preprint server for biology

|September 19, 2025

概括

odomain 4 (BRD4) 通过抑制 Aurora B 激酶活性来控制线粒分裂. 基激活酸化BRD4,使其从染色质中释放出来,使Aurora B在转化阶段发挥作用.

科学领域:

分子生物学分子生物学
细胞生物学细胞生物学
表观遗传学在表观遗传学中,表观遗传学是指表观遗传学.

背景情况:

odomain 4 (BRD4) 是染色质结构和转录的关键调节者.
BRD4在癌症和免疫反应中起着重要作用.
与其他转录调节剂不同的是,BRD4在早期线粒分裂期间仍然与染色质结合.

研究的目的:

为了研究BRD4在调节线粒分裂中的作用.
为了阐明BRD4和Aurora B激酶之间的相互作用.
了解BRD4的线粒功能是如何调节的.

主要方法:

研究了BRD4和Aurora B激酶之间的直接相互作用.
评估了BRD4结合对奥罗拉B激酶活性的影响.
检查了基因素H3和MCAK的酸化.
分析了JNK激活在BRD4从染色质释放中的作用.

主要成果:

BRD4 直接与 Aurora B 激酶活性结合并抑制它.
结合BRD4可以防止Aurora B的自酸化,以及组织蛋白H3和MCAK的酸化.
转基因激活酸化BRD4,导致其在转基因阶段从染色质中暂时释放.
极光B活性与BRD4结合相反相关,与JNK激活直接相关.

结论:

BRD4在线粒分裂过程中直接控制Aurora B激酶活性.
通过JNK介导的BRD4酸化是将其从染色质释放的关键步骤,允许Aurora B激活.
这揭示了涉及BRD4,Aurora B和JNK的线粒分裂的新型调节机制.

关键词:

极光 B 极光 B 极光这是一种BRD4激酶.在JNK中,JNK就是JNK.线粒分裂 (mitosis) 是一种发生在细胞的过程.甲基基因素的基因素是甲基基因素的基因.

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