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Merck

D6566

Sigma-Aldrich

二氢叶酸还原酶 人

≥80% (SDS-PAGE), recombinant, expressed in E. coli, ≥1 units/mg protein

别名:

DHFR, 四氢叶酸NADP+ 氧化还原酶

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About This Item

MDL號碼:
分類程式碼代碼:
12352204
NACRES:
NA.54

重組細胞

expressed in E. coli

品質等級

化驗

≥80% (SDS-PAGE)

形狀

solution

比活性

≥1 units/mg protein

分子量

25 kDa

濃度

0.02-0.06 mg/mL

UniProt登錄號

運輸包裝

wet ice

儲存溫度

−20°C

基因資訊

human ... DHFR(1719)

一般說明

人DHFR是一种含有186个氨基酸的蛋白质,具有25kDa的表观分子量。它与 大肠杆菌 蛋白质具有30%的同源性,与脊椎动物蛋白质的同源性高达70%。

應用

人二氢叶酸还原酶已被用于研究绿色荧光蛋白的稳定表达和硫氧还蛋白过氧化物酶-1基因在牛肝菌中的定向破坏。 人二氢叶酸还原酶还被用于研究人二氢叶酸还原酶作为二元复合物的结构分析中。
人二氢叶酸还原酶已被用于:
  • 研究绿色荧光蛋白的稳定表达和硫氧还蛋白过氧化物酶-1基因在牛肝菌中的定向破坏
  • 研究人二氢叶酸还原酶作为二元复合物的结构分析
  • 研究其在酶抑制研究中的体外动力学检测

生化/生理作用

Km5,6
NADPH 0.16 mM
7,8-二氢叶酸 0.03 mM
8-甲基蝶呤 0.13 mM
Ki7
叶酸 2.6x10-5 mM
甲氨蝶呤 6.1-9x10-9
二氢叶酸还原酶(DHFR)是胸苷合成中的一种关键酶。它催化二氢叶酸(DHF)还原为四氢叶酸(THF)。它以较低的速度催化叶酸转化为THF。由于胸苷是DNA合成必需的底物,因此DHFR是抗癌药物开发的靶点。甲氨蝶呤是二氢叶酸还原酶抑制剂原型。来自Sigma的酶已被用于杜氏利什曼原虫蝶啶还原酶1(PTR1)的抑制研究。该酶已被用作阳性对照,用于测定从耻垢分枝杆菌中纯化的MS0308蛋白的DHFR活性。
DHFR 基因,以及其他哺乳动物的 DHFR 基因,通过基因扩增或氨基酸突变机制克服了甲氨蝶呤的抑制作用。二氢叶酸还原酶(DHFR)可催化NADPH依赖性的二氢叶酸(DHF)还原为四氢叶酸(THF),并以更低的速率将叶酸转化为THF。反应产物THF是通过胸苷酸合成酶将脱氧尿苷酸(dUMP)转化为脱氧胸苷酸(dTMP)过程中的重要辅助因子。它是胸苷合成中的关键酶。 因此,DHFR是DNA合成中的关键酶,并已成为药物开发和癌症治疗的靶标。不同来源的DHFR之间的差异使得研究人员能够开发出种类多样的DHFR抑制剂,例如甲氧苄氨嘧啶(抗菌和抗真菌剂)、乙胺嘧啶(抗原生动物)和甲氨蝶呤; MTX(抗肿瘤药、抗牛皮癣药和抗炎药)。

單位定義

在pH 7.5,22°C条件下,一个单元可在1分钟内将1.0μmol二氢叶酸转化为四氢叶酸。

外觀

溶于含有10 mM Tris(pH 8)、1 mM EDTA、0.5 mM DTT、5μM NADPH、蛋白酶抑制剂和50%甘油中的溶液中。

儲存類別代碼

12 - Non Combustible Liquids

水污染物質分類(WGK)

WGK 1

閃點(°F)

Not applicable

閃點(°C)

Not applicable

個人防護裝備

Eyeshields, Gloves, multi-purpose combination respirator cartridge (US)


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Masahito Asada et al.
Molecular and biochemical parasitology, 181(2), 162-170 (2011-11-24)
We have achieved stable expression of green fluorescent protein (GFP) in Babesia bovis by using the WR99210/human dihydrofolate reductase (DHFR) gene selection system. A GFP-expression plasmid with a dhfr expression cassette (DHFR-gfp) was constructed and transfected into B. bovis by
Eukaryotic dihydrofolate reductase.
R L Blakley
Advances in enzymology and related areas of molecular biology, 70, 23-102 (1995-01-01)
Dimitrios Evangelopoulos et al.
The FEBS journal, 278(24), 4824-4832 (2011-10-07)
Mycobacterium tuberculosis, the most successful bacterial pathogen, causes tuberculosis, a disease that still causes more than 2 million deaths per year. Arylamine N-acetyltransferase is an enzyme that is conserved in most Mycobacterium spp. The nat gene belongs to an operon that
Eyal Sharon et al.
Proceedings of the National Academy of Sciences of the United States of America, 111(1), 451-456 (2013-12-18)
E2F transcription factors play pivotal roles in controlling the expression of genes involved in cell-cycle progression. Different viruses affect E2F1/retinoblastoma (Rb) interactions by diverse mechanisms releasing E2F1 from its suppressor Rb, enabling viral replication. We show that in T cells
Samuel Genheden
Journal of chemical information and modeling, 52(11), 3013-3021 (2012-11-02)
In this paper, I evaluate the usefulness of protein homology models in rigorous free-energy simulations to determine ligand affinities. Two templates were used to create models of the factor Xa protein and one template was used for dihydrofolate reductase from

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