SUV39H1 Histone methyltransferase that specifically trimethylates 'Lys-9' of histone H3 using monomethylated H3 'Lys- 9' as substrate. Also weakly methylates histone H1 (in vitro). H3 'Lys-9' trimethylation represents a specific tag for epigenetic transcriptional repression by recruiting HP1 (CBX1, CBX3 and/or CBX5) proteins to methylated histones. Mainly functions in heterochromatin regions, thereby playing a central role in the establishment of constitutive heterochromatin at pericentric and telomere regions. H3 'Lys-9' trimethylation is also required to direct DNA methylation at pericentric repeats. SUV39H1 is targeted to histone H3 via its interaction with RB1 and is involved in many processes, such as repression of MYOD1-stimulated differentiation, regulation of the control switch for exiting the cell cycle and entering differentiation, repression by the PML-RARA fusion protein, BMP-induced repression, repression of switch recombination to IgA and regulation of telomere length. Component of the eNoSC (energy-dependent nucleolar silencing) complex, a complex that mediates silencing of rDNA in response to intracellular energy status and acts by recruiting histone- modifying enzymes. The eNoSC complex is able to sense the energy status of cell: upon glucose starvation, elevation of NAD(+)/NADP(+) ratio activates SIRT1, leading to histone H3 deacetylation followed by dimethylation of H3 at 'Lys-9' (H3K9me2) by SUV39H1 and the formation of silent chromatin in the rDNA locus. Interacts with H3 and H4 histones. Interacts with GFI1B, DNMT3B, CBX1, CBX4, KIAA1967/DBC1, MBD1, RUNX1, RUNX3, MYOD1, SMAD5 and RB1. Interacts with SBF1 through the SET domain. Interacts with HDAC1 and HDAC2 through the N-terminus and associates with the core histone deacetylase complex composed of HDAC1, HDAC2, RBBP4 and RBBP7. Component of the eNoSC complex, composed of SIRT1, SUV39H1 and RRP8. In case of infection, interacts with HTLV-1 Tax protein, leading to abrogate Tax transactivation of HTLV-1 LTR. Interacts (via SET domain) with MECOM; enhances MECOM transcriptional repression activity. Inhibited by S-adenosyl-L-homocysteine. Negatively regulated by KIAA1967/DBC1. Belongs to the histone-lysine methyltransferase family. Suvar3-9 subfamily. Note: This description may include information from UniProtKB.
Protein type: Amino Acid Metabolism - lysine degradation; EC; Methyltransferase; Methyltransferase, protein lysine
Chromosomal Location of Human Ortholog: Xp11.23
Cellular Component:  chromatin silencing complex; chromosome, centromeric region; condensed nuclear chromosome; heterochromatin; nuclear lamina; nucleoplasm; nucleus; rDNA heterochromatin
Molecular Function:  chromatin binding; histone methyltransferase activity; histone methyltransferase activity (H3-K9 specific); histone-lysine N-methyltransferase activity; protein binding; protein N-terminus binding; S-adenosylmethionine-dependent methyltransferase activity; transcription regulatory region sequence-specific DNA binding; zinc ion binding
Biological Process:  cell cycle; cell differentiation; cellular response to DNA damage stimulus; cellular response to hypoxia; chromatin organization; chromatin silencing at rDNA; histone H3-K9 dimethylation; histone H3-K9 trimethylation; negative regulation of circadian rhythm; negative regulation of transcription by RNA polymerase II; negative regulation of transcription, DNA-templated; rhythmic process; rRNA processing; viral process
Reference #:  O43463 (UniProtKB)
Alt. Names/Synonyms: H3-K9-HMTase 1; Histone H3-K9 methyltransferase 1; Histone-lysine N-methyltransferase SUV39H1; histone-lysine N-methyltransferase, H3 lysine-9 specific 1; KMT1A; Lysine N-methyltransferase 1A; MG44; Position-effect variegation 3-9 homolog; Su(var)3-9 homolog 1; Suppressor of variegation 3-9 homolog 1; suppressor of variegation 3-9 homolog 1 (Drosophila); SUV39H; SUV39H1; SUV91
Gene Symbols: SUV39H1
Molecular weight: 47,907 Da
Basal Isoelectric point: 8.38  Predict pI for various phosphorylation states
CST Pathways:  G1/S Checkpoint  |  Histone Methylation
Protein-Specific Antibodies or siRNAs from Cell Signaling Technology® Total Proteins
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Protein Structure Not Found.

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