Formation of nucleoprotein filaments by mammalian DNA methyltransferase Dnmt3a in complex with regulator Dnmt3L.

Formation of nucleoprotein filaments by mammalian DNA methyltransferase Dnmt3a in complex with regulator Dnmt3L.
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DOI:
10.1093/nar/gkn747
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发表时间:
2008-12
影响因子:
14.9
通讯作者:
Jeltsch A
Jeltsch A
中科院分区:
生物学2区
文献类型:
--
作者:
Jurkowska RZ;Anspach N;Urbanke C;Jia D;Reinhardt R;Nellen W;Cheng X;Jeltsch A

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Dnmt 3a和Dnmt 3L的C-末端结构域形成延长的异源四聚体(3L-3a-3a-3L)。分析超离心证实Dnmt 3a-C/3L-C复合物在溶液中以2:2的异四聚体存在。3a-3a界面是DNA结合位点,而这两个界面对于CD 3 Met结合和催化活性都是必需的。发夹亚硫酸氢盐分析显示相对DNA链中距离为108 -10 bp的两个CG位点的相关甲基化,这对应于一个Dnmt 3a-C/3L-C四聚体中两个活性位点的几何形状。在相同DNA链中相似距离的两个CG位点也观察到相关的甲基化,这可以归因于两个四聚体彼此相邻的结合。DNA结合实验表明,Dnmt 3a-C/3L-C复合物在DNA上多聚化。扫描力显微镜显示细丝的形成,而不是单一的四聚体的结合,并显示蛋白质-DNA细丝的形成导致DNA长度缩短1.5倍。
The C-terminal domains of Dnmt3a and Dnmt3L form elongated heterotetramers (3L-3a-3a-3L). Analytical ultracentrifugation confirmed the Dnmt3a-C/3L-C complex exists as a 2:2 heterotetramer in solution. The 3a–3a interface is the DNA-binding site, while both interfaces are essential for AdoMet binding and catalytic activity. Hairpin bisulfite analysis shows correlated methylation of two CG sites in a distance of ∼8-10 bp in the opposite DNA strands, which corresponds to the geometry of the two active sites in one Dnmt3a-C/3L-C tetramer. Correlated methylation was also observed for two CG sites at similar distances in the same DNA strand, which can be attributed to the binding of two tetramers next to each other. DNA-binding experiments show that Dnmt3a-C/3L-C complexes multimerize on the DNA. Scanning force microscopy demonstrates filament formation rather than binding of single tetramers and shows that protein–DNA filament formation leads to a 1.5-fold shortening of the DNA length.
哺乳动物DNA甲基转移酶家族中的相互作用。
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