Structural insights into molecular mechanism for N(6)-adenosine methylation by MT-A70 family methyltransferase METTL4.
Structural insights into molecular mechanism for N(6)-adenosine methylation by MT-A70 family methyltransferase METTL4.
复制标题
DOI:
10.1038/s41467-022-33277-x
复制
发表时间:
2022-09-26
影响因子:
16.6
通讯作者:
中科院分区:
文献类型:
--
作者:
METTL4 belongs to a subclade of MT-A70 family members of methyltransferase (MTase) proteins shown to mediate N6-adenosine methylation for both RNA and DNA in diverse eukaryotes. Here, we report that Arabidopsis METTL4 functions as U2 snRNA MTase for N6−2’-O-dimethyladenosine (m6Am) in vivo that regulates flowering time, and specifically catalyzes N6-methylation of 2’-O-methyladenosine (Am) within a single-stranded RNA in vitro. The apo structures of full-length Arabidopsis METTL4 bound to S-adenosyl-L-methionine (SAM) and the complex structure with an Am-containing RNA substrate, combined with mutagenesis and in vitro enzymatic assays, uncover a preformed L-shaped, positively-charged cavity surrounded by four loops for substrate binding and a catalytic center composed of conserved residues for specific Am nucleotide recognition and N6-methylation activity. Structural comparison of METTL4 with the mRNA m6A enzyme METTL3/METTL14 heterodimer and modeling analysis suggest a catalytic mechanism for N6-adenosine methylation by METTL4, which may be shared among MT-A70 family members. Here the authors combine functional and structural work to show that METTL4 functions as U2 snRNA m6Am RNA methyltransferase supporting N6-methylation of 2’-O-methyladenosine in Arabidopsis.
登录
查看更多内容
影响因子:
48
作者:
Linder, Bastian;Grozhik, Anya V.;Olarerin-George, Anthony O.;Meydan, Cem;Mason, Christopher E.;Jaffrey, Samie R.
通讯作者:
Jaffrey, Samie R.
DOI:
10.1107/s0907444904019158
发表时间:
2004-12-01
影响因子:
2.2
作者:
Emsley, P;Cowtan, K
通讯作者:
Cowtan, K
DOI:
10.1038/84104
发表时间:
2001-02-01
期刊:
NATURE STRUCTURAL BIOLOGY
影响因子:
--
作者:
Goedecke, K;Pignot, M;Weinhold, E
通讯作者:
Weinhold, E
影响因子:
1.7
作者:
Kechin, Andrey;Boyarskikh, Uljana;Filipenko, Maxim
通讯作者:
Filipenko, Maxim
影响因子:
5.2
作者:
Deng X;Su R;Stanford S;Chen J
通讯作者:
Chen J