Molecular insights into Spindlin1-HBx interplay and its impact on HBV transcription from cccDNA minichromosome.

Molecular insights into Spindlin1-HBx interplay and its impact on HBV transcription from cccDNA minichromosome.
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Spindlin1-HBx 相互作用的分子洞察及其对 cccDNA 微型染色体 HBV 转录的影响

DOI:
10.1038/s41467-023-40225-w
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发表时间:
2023-08-03
影响因子:
16.6
通讯作者:
Li, Haitao
Li, Haitao
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Liu, Wei;Yao, Qiyan;Su, Xiaonan;Deng, Yafang;Yang, Mo;Peng, Bo;Zhao, Fan;Du, Chao;Zhang, Xiulan;Zhu, Jinsong;Wang, Daliang;Li, Wenhui;Li, Haitao

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宿主表观遗传因子和病毒蛋白之间的分子相互作用构成了维持乙型肝炎病毒(HBV)生命周期及其慢性感染的有趣机制。 HBV 编码一种调节蛋白 HBx,它可激活 HBV 基因组的转录和复制,该基因组组织为共价闭合环状 (ccc) DNA 微型染色体。在这里,我们说明 HBx 如何通过劫持 Spindlin1(包含三个连续 Tudor 域的表观遗传读取器)来完成其任务。我们的生化和结构研究表明,高度保守的 HBx N 端 2-21 片段 (HBx2-21) 与 Spindlin1 的 Tudor 3 密切相关,增强了 Tudors 2 和 1 的组蛋白 H3“K4me3-K9me3”读出。功能上,Spindlin1-HBx 接合促进染色质 cccDNA 的基因表达,并伴随着来自染色质 cccDNA 的表观遗传开关。富含 H3K9me3 的抑制状态到 H3K4me3 标记的活性状态,以及可能与其他 HBx 结合因子(例如 DDB1)协同发生的 HBx 构象转换。尽管提出了 HBx2-21 的反式抑制活性,但我们的研究揭示了 Spindlin1 在去抑制这一保守基序中的关键作用,从而促进 HBV 从其染色质化基因组转录。
Molecular interplay between host epigenetic factors and viral proteins constitutes an intriguing mechanism for sustaining hepatitis B virus (HBV) life cycle and its chronic infection. HBV encodes a regulatory protein, HBx, which activates transcription and replication of HBV genome organized as covalently closed circular (ccc) DNA minichromosome. Here we illustrate how HBx accomplishes its task by hijacking Spindlin1, an epigenetic reader comprising three consecutive Tudor domains. Our biochemical and structural studies have revealed that the highly conserved N-terminal 2–21 segment of HBx (HBx2–21) associates intimately with Tudor 3 of Spindlin1, enhancing histone H3 “K4me3-K9me3” readout by Tudors 2 and 1. Functionally, Spindlin1-HBx engagement promotes gene expression from the chromatinized cccDNA, accompanied by an epigenetic switch from an H3K9me3-enriched repressive state to an H3K4me3-marked active state, as well as a conformational switch of HBx that may occur in coordination with other HBx-binding factors, such as DDB1. Despite a proposed transrepression activity of HBx2-21, our study reveals a key role of Spindlin1 in derepressing this conserved motif, thereby promoting HBV transcription from its chromatinized genome.
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期刊: Nature
影响因子: 64.8
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影响因子: 2.2
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