H2A deubiquitinases UBP12/13 are part of the Arabidopsis polycomb group protein system

H2A deubiquitinases UBP12/13 are part of the Arabidopsis polycomb group protein system
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H2A 去泛素酶 UBP12/13 是拟南芥多梳蛋白系统的一部分

DOI:
10.1038/nplants.2016.126
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发表时间:
2016-09-01
期刊:
影响因子:
18
通讯作者:
Hennig, Lars
Hennig, Lars
中科院分区:
生物学1区
文献类型:
--
作者:
Derkacheva, Maria;Liu, Shujing;Hennig, Lars

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多梳族(PcG)蛋白在植物和动物中形成表观遗传记忆系统,但植物中的相互作用蛋白却鲜为人知。在这里,我们鉴定出拟南芥泛素特异性蛋白酶(USP;植物和酵母中的 UBP)12 和 13 作为植物特异性 PcG 蛋白如异染色质蛋白 1 (LHP1) 的伴侣。 UBP12 与 PcG 靶基因的染色质结合,是组蛋白 H3 赖氨酸 27 三甲基化和抑制 PcG 靶基因子集所必需的。缺乏UBP12和UBP13的植物在没有受精的情况下发育出自主胚乳。我们已将 UBP12 和 UBP13 鉴定为植物 PcG 调控网络中的新蛋白质。 UBP12 和 UBP13 属于一个古老的基因家族,代表后生动物 USP7 的植物同源物。我们发现果蝇 USP7 与 UBP12/13 及其同源物 UBP26 具有异染色质基因抑制功能。总之,我们证明 USP7 样蛋白对于不同基因组环境中的基因沉默至关重要。
Polycomb group (PcG) proteins form an epigenetic memory system in plants and animals, but interacting proteins are poorly known in plants. Here, we have identified Arabidopsis UBIQUITIN SPECIFIC PROTEASES (USP; UBP in plant and yeasts) 12 and 13 as partners of the plant-specific PcG protein LIKE HETEROCHROMATIN PROTEIN 1 (LHP1). UBP12 binds to chromatin of PcG target genes and is required for histone H3 lysine 27 trimethylation and repression of a subset of PcG target genes. Plants lacking UBP12 and UBP13 developed autonomous endosperm in the absence of fertilization. We have identified UBP12 and UBP13 as new proteins in the plant PcG regulatory network. UBP12 and UBP13 belong to an ancient gene family and represent plant homologues of metazoan USP7. We have found that Drosophila USP7 shares a function in heterochromatic gene repression with UBP12/13 and their homologue UBP26. In summary, we demonstrate that USP7-like proteins are essential for gene silencing in diverse genomic contexts.