PBRM1 bromodomains associate with RNA to facilitate chromatin association.

PBRM1 bromodomains associate with RNA to facilitate chromatin association.
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DOI:
10.1093/nar/gkad072
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发表时间:
2023-05-08
影响因子:
14.9
通讯作者:
--
中科院分区:
生物学2区
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PBRM 1是PBAF染色质重塑复合物的亚基,其在40-50%的透明细胞肾细胞癌患者中突变。它被认为主要作为PBAF复合物的染色质结合亚基发挥作用,但这种活性的分子机制尚不完全清楚。PBRM 1含有六个串联的溴结构域,已知它们在组蛋白H3赖氨酸14(H3 K14 ac)处乙酰化的核小体结合中协作。在这里,我们证明了来自PBRM 1的第二和第四溴结构域也结合核酸,选择性地与双链RNA元件结合。发现RNA结合口袋的破坏损害PBRM 1染色质结合并抑制PBRM 1介导的细胞生长效应。
PBRM1 is a subunit of the PBAF chromatin remodeling complex, which is mutated in 40–50% of clear cell renal cell carcinoma patients. It is thought to largely function as a chromatin binding subunit of the PBAF complex, but the molecular mechanism underlying this activity is not fully known. PBRM1 contains six tandem bromodomains which are known to cooperate in binding of nucleosomes acetylated at histone H3 lysine 14 (H3K14ac). Here, we demonstrate that the second and fourth bromodomains from PBRM1 also bind nucleic acids, selectively associating with double stranded RNA elements. Disruption of the RNA binding pocket is found to compromise PBRM1 chromatin binding and inhibit PBRM1-mediated cellular growth effects.
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