The cytosolic Fe-S cluster assembly component MET18 is required for the full enzymatic activity of ROS1 in active DNA demethylation

被引:31
作者
Wang, Xiaokang [1 ,2 ]
Li, Qi [1 ,2 ]
Yuan, Wei [1 ,2 ]
Cao, Zhendong [1 ,2 ]
Qi, Bei [1 ,2 ]
Kumar, Suresh [3 ]
Li, Yan [1 ,2 ]
Qian, Weiqiang [1 ,2 ]
机构
[1] Peking Univ, Sch Adv Agr Sci, Peking Tsinghua Ctr Life Sci, State Key Lab Prot & Plant Gene Res, Beijing 100871, Peoples R China
[2] Peking Univ, Sch Life Sci, Beijing 100871, Peoples R China
[3] Indian Agr Res Inst, Div Biochem, New Delhi 110012, India
来源
SCIENTIFIC REPORTS | 2016年 / 6卷
基金
中国国家自然科学基金;
关键词
IRON-SULFUR PROTEINS; DOMAIN PROTEIN; HISTONE ACETYLTRANSFERASE; ARABIDOPSIS; METHYLATION; GENE; BIOGENESIS; DEMETER; EUKARYOTES; MATURATION;
D O I
10.1038/srep26443
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
DNA methylation patterns in plants are dynamically regulated by DNA methylation and active DNA demethylation in response to both environmental changes and development of plant. Beginning with the removal of methylated cytosine by ROS1/DME family of 5-methylcytosine DNA glycosylases, active DNA demethylation in plants occurs through base excision repair. So far, many components involved in active DNA demethylation remain undiscovered. Through a forward genetic screening of Arabidopsis mutants showing DNA hypermethylation at the EPF2 promoter region, we identified the conserved iron-sulfur cluster assembly protein MET18. MET18 dysfunction caused DNA hypermethylation at more than 1000 loci as well as the silencing of reporter genes and some endogenous genes. MET18 can directly interact with ROS1 in vitro and in vivo. ROS1 activity was reduced in the met18 mutant plants and point mutation in the conserved Fe-S cluster binding motif of ROS1 disrupted its biological function. Interestingly, a large number of DNA hypomethylated loci, especially in the CHH context, were identified from the met18 mutants and most of the hypo-DMRs were from TE regions. Our results suggest that MET18 can regulate both active DNA demethylation and DNA methylation pathways in Arabidopsis.
引用
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页数:15
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