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A Molecular Prospective for HIRA Complex Assembly and H3.3-Specific Histone Chaperone Function

机译:HIRA复合组装和H3.3特异性组蛋白伴伴功能的分子前瞻性

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Incorporation of variant histone sequences, in addition to post-translational modification of histones, serves to modulate the chromatin environment. Different histone chaperone proteins mediate the storage and chromatin deposition of variant histones. Although the two non-centromeric histone H3 variants, H3.1 and H3.3, differ by only 5 aa, replacement of histone H3.1 with H3.3 can modulate the transcription for highly expressed and developmentally required genes, lead to the formation of repressive heterochromatin, or aid in DNA and chromatin repair. The human histone cell cycle regulator (HIRA) complex composed of HIRA, ubinuclein-1, CABIN1, and transiently anti-silencing function 1, forms one of the two complexes that bind and deposit H3.3/H4 into chromatin. A number of recent biochemical and structural studies have revealed important details underlying how these proteins assemble and function together as a multiprotein H3.3-specific histone chaperone complex. Here, we present a review of existing data and present a new model for the assembly of the HIRA complex and for the HIRA-mediated incorporation of H3.3/H4 into chromatin. (C) 2016 Elsevier Ltd. All rights reserved.
机译:除了组织蛋白的翻译后修饰之外,还掺入变体组蛋白序列是用于调节染色质环境。不同的组蛋白伴侣蛋白介导变体组蛋白的储存和染色质沉积。虽然两个非浓缩组蛋白H3变体H3.1和H3.3仅不同5A,但用H3.3替换组蛋白H3.1可以调节高表达和发育所需基因的转录,导致形成抑制杂化素,或帮助DNA和染色质修复。由Hira,UbinIn蛋白-1,机舱1和瞬时抗沉默功能1组成的人组蛋白细胞周期调节剂(Hira)复合物形成将其与H3.3 / H4结合到染色质中的两种复合物中的一种。最近的一些生化和结构研究揭示了这些蛋白质如何将这些蛋白质组装和起作用作为多蛋白H3.3特异性组蛋白伴侣复合物的重要细节。在这里,我们介绍了现有数据的审查,并为Hira综合体组装和Hira介导的H3.3 / H4掺入染色质的新模型。 (c)2016 Elsevier有限公司保留所有权利。

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