DESCRIPTION:Human recombinant SUV420H1, transcript variant 2 expressed in Sf9 insect cells with an N-terminal GST-tag. Catalyzes the transfer of methyl groups from S-adenosyl-L-methionine (SAM) to the epsilon-amino function of protein L-lysine residues, specifically converting monomethyl histone H4 lysine-20 (H4K20me) to the di- and trimethylated forms (H4K20me2/3). Results with mice and mouse cells deleted of SUV420H1 and/or the related enzyme SUV420H2 suggest that, in vivo, SUV420H1 may have the primary role in generating H4K20me2, whereas H4K20me3 is mostly the product of SUV420H2. However, transfection and chromatin localization studies with the human enzymes SUV420H1-tv1, SUV420H1-tv2 and SUV420H2 implicate all three in the generation of H4K20me3, with SUV420H1-tv2 found in both the nucleus and cytoplasm and producing the H4K20me3 mark throughout the nucleus. The methylation state of H4K20 is linked to the cell cycle, with the SUV420H1 conversion of SET8-generated H4K20me1 to H4K20me2 occurring broadly throughout the genome in the G1 phase. Entry into S-phase is delayed by an SUV420H1/2 double knockout, presumably due to the role of these enzymes and H4K20me2/3 in recruitment of the origin of replication complex (ORC). The SUV420H enzymes also play a role in DNA damage repair via the stabilizing effect of H4K20me2 on recruitment of 53BP1 to double strand breaks. The decrease in H4K20me3 at telomeres in SUV420H1/2-depleted cells promotes telomere elongation and recombination. Induced pluripotent stem cells (iPS) generated from SUV420H1/2-deleted cells display both these telomere effects and increased tumorigenic potential, suggesting, along with the prevalent loss of H4K20me3 from human cancer cells, that SUV420H1/2 may function as tumor suppressors.
ACCESSION #: NM_016028
Uniprot Link
INCLUDES AMINO ACIDS: 2-393 (C-term.)
TAG(S): N-terminal GST-tag
MW: 73.2 kDa
EXPRESSION SYSTEM: Insect cell/Baculovirus
SUPPLIED AS: Solution of purified recombinant protein in 50 mM Tris/HCl pH 7.5, 500 mM NaCl, 1 mM TCEP, 10% glycerol (v/v).
STORAGE: -80°C, aliquot and snap-freeze after first use.
View Product Data Sheet
Substantial Discounts Available on Bulk Quantities
We also offer assay services for SUV420H1-tv2.
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ReactionBiology详细产品列表：货号产品价格（美元）HMT-11-376ASH1L(His)Methyltransferase325DMT-21-124DNMT1450DMT-21-125DNMT3aMethyltransferase450DMT-21-126 DNMT3b450HMT-11-101DOT1LMethyltransferase395HMT-25-115 EZH1Complex450HMT-25-114EZH2Complex799HMT-25-173EZH2-Y641FComplex799HMT-11-102G9aMethyltransferase(GST)(aa786-1210)299HMT-11-245G9aMethyltransferase(His)(aa913-1193)299HMT-12-104G9a/GLPComplexMethyltransferase325HMT-11-103GLPMethyltransferaseProtein299HMT-15-105MLL1Complex499HMT-15-106 MLL2Complex499HMT-15-107MLL3Complex499HMT-15-108 MLL4Complex499MT-11-359NNMT(GST)(NicotinamideN-Methyltransferase)299MT-11-358NNMT(His)(NicotinamideN-Methyltransferase)299HMT-11-319NRMT1(GST)325HMT-21-139NSD1Methyltransferase450HMT-21-1380NSD2(His)Methyltransferase450HMT-21-122 NSD2Methyltransferase550HMT-11-377NSD2SET(His)325HMT-21-159NSD2-E1099KMethyltransferase599HMT-11-378NSD2-E1099K-SET(His)325HMT-21-181NSD2-T1150AMethyltransferase450HMT-11-379NSD2-T1150A-SET(His)325HMT-11-132 NSD3Methyltransferase325HMT-21-348PRDM2Methyltransferase325HMT-21-152PRDM9Methyltransferase450HMT-11-119PRMT1Methyltransferase325HMT-11-113PRMT3Methyltransferase325HMT-11-120PRMT4Methyltransferase399HMT-21-172PRMT5Methyltransferase450HMT-22-434PRMT5(C449S)/MEP50799HMT-22-148PRMT5/MEP50Complex799HMT-11-121PRMT6Methyltransferase(GST)325HMT-21-380PRMT6Methyltransferase(His)325HMT-21-382PRMT7(His)450HMT-11-135PRMT8Methyltransferase325MT-11-356s-COMT(His)(SolubleCatechol-O-Methyltransferase)299MT-11-357s-COMT(V108M)(His)(SolubleCatechol-O-Methyltransferase）299HMT-15-116 SET1AComplex(5-subunits)499HMT-15-117SET1BComplex(5-subunits)499HMT-11-133SET7/9Methyltransferase299HMT-11-476SET8(GST)299HMT-11-118 SET8Methyltransferase299HMT-11-128 SETD2(GST)Methyltransferase299HMT-11-129SETD2(His)Methyltransferase299HMT-11-110SMYD2Methyltransferase325HMT-11-111SUV39H1Methyltransferase299HMT-11-418SUV39H2(GST)Methyltransferase299HMT-11-112SUV39H2(His)Methyltransferase299HMT-21-149SUV420H1-tv1Methyltransferase450HMT-21-150SUV420H1-tv2Methyltransferase450HMT-21-349SUV420H2Methyltransferase325HMT-14-109WRAD2375HMT-14-438(H3.3-H4)2Tetramer325HMT-35-435CoreHistones(Chicken)250HMT-11-184Fibrillarin(GST)325HMT-11-183Fibrillarin(His)325HMT-11-137GST-GAR299HMT-12-316H2A/H2Bdimers325HMT-11-180HistoneH1.050HMT-11-146HistoneH2A50HMT-11-147HistoneH2B50HMT-11-134 HistoneH3.350HMT-35-179Nucleosomes(ChickenMono/Di)280HMT-35-182Nucleosomes(ChickenOligo/PolyH5Enriched)280
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调节至最适合温度（一般是37度），合适的酸碱度时，酶的活性最高
1，底物DNA上没有该限制酶的识别、切断位点。特别是一些经过重组等处理的DNA，碱基易发生缺失、变化等。
2，限制酶识别位点上的A或C被甲基化。部分限制酶对识别位点中的碱基是否被甲基化比较敏感，从而无法切断该位点。
3，底物不纯。如果底物DNA中有限制酶阻害物质，回影响限制酶的酶切作用。在此种情况下，底物DNA须重新进行精制。
4，限制酶的识别、切断位点在底物DNA的高级构造中所处的位置，对酶切反应也有一定的影响，例如,限制酶NaeI在切断pBR322DNA时,就有着非常难以切断的部位。
5，限制性内切酶本身无活性或低活性
决定酶促反应最大速度Vm的因素是什么？是同一底物，尽管加不同种酶，其Vmax都相同吗?可以画曲线图解释一下吗？可是根据米曼氏方程来看又有点矛盾，Km变大，Vmax也需变大，才可使v变大。所以题目所述到底应该怎么理解呢
