Key Points
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Nine protein arginine methyltransferases (PRMTs) are encoded in mammalian genomes. Each PRMT isoform harbours the characteristic motifs of the seven-β-strand methyltransferase family, as well as additional 'double E' and 'THW' sequence motifs that are particular to the PRMT subfamily of methyltransferases.
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The PRMTs catalyse three types of arginine methylation. Monomethylation is regarded as an intermediate in the formation of dimethylated arginine. PRMT1 is the primary enzyme responsible for asymmetric dimethylation, and PRMT5 is the primary enzyme responsible for symmetric dimethylation.
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Prmt1- and Prmt5-knockout mice die very early during development, probably when the maternal RNA pool is depleted. This reflects the housekeeping nature of the two enzymes encoded by these genes. Co-activator-associated arginine methyltransferase 1 (Carm1)-knockout mice die at birth and display differentiational defects in a number of cell types. Knockout mice missing Prmt2, Prmt3 and Prmt6 are viable.
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The expression of some genes encoding PRMTs may be altered in certain cancers. The nuclear receptor co-activators PRMT1 and CARM1 are overexpressed in breast cancers and prostate cancers. The transcriptional co-repressors PRMT5 and PRMT6 suppress the expression of tumour suppressor genes and are overexpressed in lung cancer and blood cancers.
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Proteins that harbour tudor domains bind selectively to arginine-methylated motifs. The overexpression of methylarginine effector molecules, such as tudor domain-containing protein 3 (TDRD3), is linked to poor prognosis for the survival of patients with breast cancer.
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Whole-genome analyses of cancers have revealed cancer-associated alterations in PRMT8, but in no other PRMT. It is likely that cancer-associated mutations might be identified in additional PRMTs as sequencing depth increases and additional cancer types are explored.
Abstract
There are nine protein arginine methyltransferases (PRMTs) encoded in mammalian genomes, the protein products of which catalyse three types of arginine methylation — monomethylation and two types of dimethylation. Protein arginine methylation is an abundant modification that has been implicated in signal transduction, gene transcription, DNA repair and mRNA splicing, among others. Studies have only recently linked this modification to carcinogenesis and metastasis. Sequencing studies have not generally found alterations to the PRMTs; however, overexpression of these enzymes is often associated with various cancers, which might make some of them viable targets for therapeutic strategies.
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Acknowledgements
The authors apologize to those researchers whose original work could not be cited owing to space constraints. M.T.B. is supported by a US National Institutes of Health grant DK62248 and CPRIT funding RP110471.
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M.T.B. is a consultant for CellCentric, Ltd., Cambridge, UK. He is also a cofounder of EpiCypher.
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Glossary
- Guanidino group
-
Guanidine is the functional group of arginine. The central bond in this group is an imine, and the group is structurally related to urea. The guanidine group is protonated under physiological conditions. This positive charge is not affected by the methylation of the guanidino nitrogen atoms.
- Post-translational modification
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(PTM). The chemical modification of a protein after its translation. Common types of PTMs are phosphorylation, acetylation, ubiquitylation and methylation.
- Glycine- and arginine-rich (GAR) motifs
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Proteins with GAR motifs are major targets of arginine methylation. These types of motifs are methylated by most of the characterized PRMTs, with the exception of CARM1.
- PGM motif
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Proteins harbouring arginine residues in proline-, glycine- and methionine-rich regions (PGM motifs) are targeted for arginine methylation by PRMT5 and CARM1.
- AdoMet
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S-adenosyl methionine (SAM) is the donor substrate for methyl group transfer and is referred to as both AdoMet and SAM in the biochemical literature. AdoMet is generated in the cell from methionine by methionine adenosyltransferase and ATP.
- Histone tail
-
Histones are globular proteins with a flexible amino-terminal tail that protrudes from the nucleosome. These tails are subject to a variety of post-translational modifications, which regulate DNA access.
- Carboxy-terminal domain (CTD) of RNA polymerase II
-
The CTD of RNA polymerase II is composed of up to 52 heptapeptide repeats (YSPTSPS) that are essential for RNA polymerase activity. These repeats are not perfect, and one harbours an arginine residue (R1810) that can be methylated by CARM1.
- Adenosine-2′,3′-dialdehyde
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(AdOx). A small molecule that inhibits S-adenosyl homocysteine (AdoHcy) hydrolase. As a consequence of AdOx treatment, intracellular AdoHcy levels accumulate. Most methylation reactions are blocked through feedback inhibition by elevated levels of AdoHcy.
- Tudor domains
-
Conserved protein folds of about 50 amino acids. In mammals, there are more than 30 tudor domain-containing proteins. These proteins often have multiple copies of this domain. A subset of tudor domains contain an aromatic cage that can interact with methyl-lysine and methylarginine motifs.
- Homologous recombination repair
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(HRR). An identical or nearly identical DNA sequence from a homologous chromosome is used as a template for the repair of a DNA break.
- γH2AX foci
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The histone H2AX becomes phosphorylated on S139 in response to DNA damage. The phosphoryated form of this histone is referred to as γH2AX. At sites of DNA double-strand breaks, γH2AX forms foci that can be detected with a phospho-specific antibody.
- Epithelial–mesenchymal transition
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(EMT). A normal cellular process that is characterized by the loss of cell adhesion and increased cell mobility that is essential for embryogenesis. When cancer cells undergo EMT they become mobile, which results in metastasis.
- 5′-methylthioadenosine
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A nucleoside that is used as a broad-spectrum small-molecule methyltransferase inhibitor. Unlike AdOx, it is an AdoMet analogue that functions directly as a competitive inhibitor of methyltransferases.
- Jumonji C domain
-
A large class of more than 30 enzymes contain a conserved Jumonji C domain. A subset of these enzymes catalyse lysine demethylation through an oxidative reaction that requires the cofactors Fe(II) and α-ketoglutarate.
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Yang, Y., Bedford, M. Protein arginine methyltransferases and cancer. Nat Rev Cancer 13, 37–50 (2013). https://doi.org/10.1038/nrc3409
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DOI: https://doi.org/10.1038/nrc3409
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