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Structure and Mechanism of Plant DNA Methyltransferases

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DNA Methyltransferases - Role and Function

Part of the book series: Advances in Experimental Medicine and Biology ((AEMB,volume 1389))

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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Correspondence to Xuehua Zhong .

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© 2022 The Author(s), under exclusive license to Springer Nature Switzerland AG

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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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