Histone deacetylase HDA6 is functionally associated with AS1 in repression of KNOX genes in arabidopsis.

Histone deacetylase HDA6 is functionally associated with AS1 in repression of KNOX genes in arabidopsis.
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拟南芥中组蛋白脱乙酰酶 HDA6 与 AS1 抑制 KNOX 基因功能相关

DOI:
10.1371/journal.pgen.1003114
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发表时间:
2012
期刊:
影响因子:
4.5
通讯作者:
Wu K
Wu K
中科院分区:
生物学2区
文献类型:
--
作者:
Luo M;Yu CW;Chen FF;Zhao L;Tian G;Liu X;Cui Y;Yang JY;Wu K

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不对称叶1(AS 1)是一种MYB型转录抑制因子,通过调控KNOX基因的表达来控制叶片发育,但其分子机制尚不清楚。在这项研究中,我们证明了AS 1可以在体外和体内与组蛋白去乙酰化酶HDA 6相互作用。在HDA 6突变体axe 1 -5中,KNOX基因被上调和过度乙酰化,表明HDA 6可能通过组蛋白去乙酰化来调节KNOX的表达。与单突变体相比,as 1 -1/axe 1 -5和as 2 -1/axe 1 -5双突变体表现出更严重的锯齿叶和短叶柄表型。此外,在as 1 -1/axe 1 -5和as 2 -1/axe 1 -5双突变体中,叶片和小叶状结构的出现频率也增加,表明HDA 6与AS 1和AS 2共同调控叶片发育。染色质免疫沉淀分析显示HDA 6和AS 1直接结合KNAT 1、KNAT 2和KNATM染色质。总之,这些数据表明HDA 6是AS 1阻遏物复合物的一部分,以调节叶片发育中的KNOX表达。
ASYMMETRIC LEAVES 1 (AS1) is a MYB-type transcription repressor that controls leaf development by regulating KNOX gene expression, but the underlying molecular mechanism is still unclear. In this study, we demonstrated that AS1 can interact with the histone deacetylase HDA6 in vitro and in vivo. The KNOX genes were up-regulated and hyperacetylated in the hda6 mutant, axe1-5, indicating that HDA6 may regulate KNOX expression through histone deacetylation. Compared with the single mutants, the as1-1/axe1-5 and as2-1/axe1-5 double mutants displayed more severe serrated leaf and short petiole phenotypes. In addition, the frequencies of leaf lobes and leaflet-like structures were also increased in as1-1/axe1-5 and as2-1/axe1-5 double mutants, suggesting that HDA6 acts together with AS1 and AS2 in regulating leaf development. Chromatin immunoprecipitation assays revealed that HDA6 and AS1 bound directly to KNAT1, KNAT2, and KNATM chromatin. Taken together, these data indicate that HDA6 is a part of the AS1 repressor complex to regulate the KNOX expression in leaf development.
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