Abstract
DNA methylation is an important epigenetic mark conserved in eukaryotes from fungi to animals and plants, where it plays a crucial role in regulating gene expression and transposon silencing. Once the methylation mark is established by de novo DNA methyltransferases, specific regulatory mechanisms are required to maintain the methylation state during chromatin replication, both during meiosis and mitosis. Plant DNA methylation is found in three contexts; CG, CHG, and CHH (H = A, T, C), which are established and maintained by a unique set of DNA methyltransferases and are regulated by plant-specific pathways. DNA methylation in plants is often associated with other epigenetic modifications, such as noncoding RNA and histone modifications. This chapter focuses on the structure, function, and regulatory mechanism of plant DNA methyltransferases and their crosstalk with other epigenetic pathways.
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Abbreviations
- 5mC:
-
5-Methyl-cytosine
- 6 mA:
-
6-Methyl-adenine
- AdoHcy:
-
S-Adenosyl-L-homocysteine
- AdoMet:
-
S-Adenosyl-L-methionine
- AGO4:
-
ARGONAUTE 4
- BAH domain:
-
Bromo-adjacent homology domain
- CMT:
-
CHROMOMETHYLASE
- DCL3:
-
DICER-LIKE 3
- DDM1:
-
DECREASED IN DNA METHYLATION 1
- DRM2:
-
DOMAINS REARRANGED METHYLTRANSFERASE 2
- ITC:
-
Isothermal titration calorimetry
- KYP:
-
KRYPTONITE
- MET1:
-
DNA METHYLTRANSFERASE 1
- MTase:
-
Methyltransferase
- PKMT:
-
Protein lysine methyltransferase
- Pol II/IV/V:
-
RNA polymerase II/IV/V
- RdDM:
-
RNA-directed DNA methylation
- RDR2:
-
RNA-DEPENDENT RNA POLYMERASE 2
- RFTD:
-
Replication foci targeting domain
- SET domain:
-
Su(var)3–9, enhancer of zeste, trithorax domain
- SHH1:
-
SAWADEE HOMEODOMAIN HOMOLOG 1
- SRA domain:
-
SET and RING finger-associated domain
- SUVH:
-
SUPPRESSOR OF VARIEGATION 3–9 HOMOLOG
- TE:
-
Transposable elements
- TRD:
-
Target recognition domain
- UBA:
-
Ubiquitin-associated domain
- UHRF1:
-
Ubiquitin-like PHD and RING finger domains 1
- VIM:
-
VARIANT IN METHYLATION
- ZMET2:
-
Zea methyltransferase 2
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Acknowledgments
We apologize to those whose work was not discussed due to the space limitation. We would like to thank Zhong lab members Dr. Jianjun Jiang and Ray Scheid for the critical reading of this manuscript. This work was supported by NSF (MCB-1552455 and MCB-2043544) and the NIH-MIRA (R35GM124806) awards to XZ, and the Shenzhen Science and Technology Program (JCYJ20200109110403829) to JD.
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Leichter, S.M., Du, J., Zhong, X. (2022). Structure and Mechanism of Plant DNA Methyltransferases. In: Jeltsch, A., Jurkowska, R.Z. (eds) DNA Methyltransferases - Role and Function. Advances in Experimental Medicine and Biology, vol 1389. Springer, Cham. https://doi.org/10.1007/978-3-031-11454-0_6
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