Unannotated microprotein EMBOW regulates the interactome and chromatin and mitotic functions of WDR5.

Unannotated microprotein EMBOW regulates the interactome and chromatin and mitotic functions of WDR5.
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DOI:
10.1016/j.celrep.2023.113145
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发表时间:
2023-09-26
期刊:
影响因子:
8.8
通讯作者:
--
中科院分区:
生物学1区
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--
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保守的 WD40 重复蛋白 WDR5 与细胞核内外的多种蛋白质相互作用。然而,目前尚不清楚 WDR5 在复合物之间的分布是否以及如何受到调节。在这里,我们展示了人类 SCRIB 基因中双重编码的未注释的微生物蛋白 EMBOW(WDR5 的内源性微生物蛋白结合剂)与 WDR5 相互作用,并调节其与多个相互作用伙伴的结合,包括 KMT2A 和 KIF2A。 EMBOW 受细胞周期调节,在 G1 期晚期和 G2/M 期有两个表达最大值。 EMBOW 的缺失会减少 WDR5 与 KIF2A 的相互作用,异常缩短有丝分裂纺锤体长度,延长 G2/M 期,并延迟细胞增殖。相反,EMBOW 的缺失会增加 WDR5 与 KMT2A 的相互作用,导致 WDR5 与脱靶基因结合,错误地增加 H3K4me3 水平,并激活这些基因的转录。总之,这些结果表明 EMBOW 作为 WDR5 的调节剂,可调节其相互作用并防止其在多种情况下脱靶结合。陈等人。表明人类 SCRIB 双重编码一种未注释的细胞周期调节微生物蛋白 EMBOW。 EMBOW 与 WDR5 相互作用,并调节其与多个相互作用伙伴(包括 KMT2A 和 KIF2A)的结合,从而在细胞周期中保护 WDR5 在染色质和有丝分裂纺锤体上的靶向结合。
The conserved WD40-repeat protein WDR5 interacts with multiple proteins both inside and outside the nucleus. However, it is currently unclear whether and how the distribution of WDR5 between complexes is regulated. Here, we show that an unannotated microprotein EMBOW (endogenous microprotein binder of WDR5) dually encoded in the human SCRIB gene interacts with WDR5 and regulates its binding to multiple interaction partners, including KMT2A and KIF2A. EMBOW is cell cycle regulated, with two expression maxima at late G1 phase and G2/M phase. Loss of EMBOW decreases WDR5 interaction with KIF2A, aberrantly shortens mitotic spindle length, prolongs G2/M phase, and delays cell proliferation. In contrast, loss of EMBOW increases WDR5 interaction with KMT2A, leading to WDR5 binding to off-target genes, erroneously increasing H3K4me3 levels, and activating transcription of these genes. Together, these results implicate EMBOW as a regulator of WDR5 that regulates its interactions and prevents its off-target binding in multiple contexts. Chen et al. show that human SCRIB dually encodes an unannotated, cell-cycle-regulated microprotein, EMBOW. EMBOW interacts with WDR5 and regulates its binding to multiple interaction partners, including KMT2A and KIF2A, safeguarding WDR5 on-target binding on chromatin and the mitotic spindle during the cell cycle.
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