Structural and functional profiling of the human histone methyltransferase SMYD3.

Structural and functional profiling of the human histone methyltransferase SMYD3.
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DOI:
10.1371/journal.pone.0022290
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发表时间:
2011
期刊:
影响因子:
3.7
通讯作者:
Tucker P
Tucker P
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Foreman KW;Brown M;Park F;Emtage S;Harriss J;Das C;Zhu L;Crew A;Arnold L;Shaaban S;Tucker P

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SET 和 MYND 结构域 (SMYD) 蛋白包含一个独特的多结构域 SET 组蛋白甲基转移酶家族,与人类癌症进展有关。在此,我们报告了对全长人 SMYD3 与 S-腺苷甲硫氨酸 (SAM) 甲基供体辅因子类似物复合物中晶体结构的分析。该结构揭示了一种整体紧凑的结构,其中“split-SET”结构域采用规范的SET结构域折叠,并与Zn结合MYND结构域和C端超螺旋9 α-螺旋束紧密组装,类似于在小鼠SMYD1结构中观察到的结构。总之,这些结构上互锁的结构域为组蛋白底物施加了高度限制的结合袋,表明其酶活性的调节机制。我们的突变和生化分析证实了核心 SET 结构域内部和外部的独特结构元件的调节作用,并建立了以前未检测到的 H4K20 三甲基化偏好。
The SET and MYND Domain (SMYD) proteins comprise a unique family of multi-domain SET histone methyltransferases that are implicated in human cancer progression. Here we report an analysis of the crystal structure of the full length human SMYD3 in a complex with an analog of the S-adenosyl methionine (SAM) methyl donor cofactor. The structure revealed an overall compact architecture in which the “split-SET” domain adopts a canonical SET domain fold and closely assembles with a Zn-binding MYND domain and a C-terminal superhelical 9 α-helical bundle similar to that observed for the mouse SMYD1 structure. Together, these structurally interlocked domains impose a highly confined binding pocket for histone substrates, suggesting a regulated mechanism for its enzymatic activity. Our mutational and biochemical analyses confirm regulatory roles of the unique structural elements both inside and outside the core SET domain and establish a previously undetected preference for trimethylation of H4K20.
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