ArticlebioRxiv : the preprint server for biology2025
BRD4 regulates Aurora B kinase activity.
Article in bioRxiv : the preprint server for biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
BRD4, a pleiotropic regulator of chromatin structure and transcription, plays critical roles in cancer and immune responses. Unlike other transcriptional regulators, BRD4 largely remains bound to chromosomes during early mitosis. Here we report that BRD4 also regulates mitosis through its direct interaction with and phosphorylation of Aurora B kinase, an essential regulator of mitosis. BRD4 binding to Aurora B inhibits its kinase activity, preventing autophosphorylation and phosphorylation of the key mitotic targets histone H3 and MCAK, the mitotic centromere associated kinesin. This inhibition is relieved during metaphase when JNK is activated and phosphorylates BRD4, triggering its transient release from chromatin. Importantly, Aurora B activity during mitosis inversely correlates with BRD4 binding and directly correlates with JNK activation and BRD4 release. Our findings thus reveal a regulatory mechanism whereby Aurora B activity is directly controlled by BRD4, which in turn is regulated by JNK.
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