@article{2c1933b28f7844b28ecf1660fcab4269,
title = "F-box protein CFK1 interacts with and degrades de novo DNA methyltransferase in Arabidopsis",
abstract = "DNA methylation plays crucial roles in cellular development and stress responses through gene regulation and genome stability control. Precise regulation of DOMAINS REARRANGED METHYLTRANSFERASE 2 (DRM2), the de novo Arabidopsis DNA methyltransferase, is crucial to maintain DNA methylation homeostasis to ensure genome integrity. Compared with the extensive studies on DRM2 targeting mechanisms, little information is known regarding the quality control of DRM2 itself. Here, we conducted yeast two-hybrid screen assay and identified an E3 ligase, COP9 INTERACTING F-BOX KELCH 1 (CFK1), as a novel DRM2-interacting partner and targets DRM2 for degradation via the ubiquitin-26S proteasome pathway in Arabidopsis thaliana. We also performed whole genome bisulfite sequencing (BS-seq) to determine the biological significance of CFK1-mediated DRM2 degradation. Loss-of-function CFK1 leads to increased DRM2 protein abundance and overexpression of CFK1 showed reduced DRM2 protein levels. Consistently, CFK1 overexpression induces genome-wide CHH hypomethylation and transcriptional de-repression at specific DRM2 target loci. This study uncovered a distinct mechanism regulating de novo DNA methyltransferase by CFK1 to control DNA methylation level.",
keywords = "Arabidopsis thaliana, DNA methylation, F-box protein, epigenetics, post-translational modification, ubiquitin proteasome pathway",
author = "Jiani Chen and Jie Liu and Jianjun Jiang and Shuiming Qian and Jingwen Song and Rachel Kabara and Isabel Delo and Giovanna Serino and Fengquan Liu and Zhihua Hua and Xuehua Zhong",
note = "Funding Information: We would like to thank Professors Richard Vierstra at Washington University in St Louis for the ubiquitin antibody and Nam‐Hai Chua at Rockefeller University for the β‐estradiol‐inducible pER8 vector. We thank Professor Ning Zheng at the University of Washington for valuable suggestions. Work in the Zhong laboratory was supported by a NSF CAREER award (MCB‐1552455), NIH‐MIRA (R35GM124806), and USDA & National Institute of Food and Agriculture grant (Hatch 1012915) and work in the Hua laboratory was supported by a NSF CAREER award (MCB‐1750361). Funding Information: We would like to thank Professors Richard Vierstra at Washington University in St Louis for the ubiquitin antibody and Nam-Hai Chua at Rockefeller University for the β-estradiol-inducible pER8 vector. We thank Professor Ning Zheng at the University of Washington for valuable suggestions. Work in the Zhong laboratory was supported by a NSF CAREER award (MCB-1552455), NIH-MIRA (R35GM124806), and USDA & National Institute of Food and Agriculture grant (Hatch 1012915) and work in the Hua laboratory was supported by a NSF CAREER award (MCB-1750361). Publisher Copyright: {\textcopyright} 2020 The Authors New Phytologist {\textcopyright} 2020 New Phytologist Foundation",
year = "2021",
month = mar,
doi = "10.1111/nph.17103",
language = "English",
volume = "229",
pages = "3303--3317",
journal = "New Phytologist",
issn = "0028-646X",
number = "6",
}