亮氨酸脱氢酶 来源于芽孢杆菌属

CAS: 9082-71-7 货号: L1493003 EC号: EC 1.4.1.9
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级别和纯度: 生物活性 ? 生物活性级(Bioactive)—— 经验证在功能检测中保持生物活性。当分子须具有功能活性而不仅是纯度时使用。 ActiBioPure™ ? ActiBioPure™ —— 阿拉丁面向生物活性和重组产品的优质系列。当同时需要高纯度和保持生物活性时使用。 天然 ? 天然型(Native)—— 处于天然(非重组、非变性)形态的蛋白/生物分子。当需要天然结构和活性时使用。 高性能 ? 高性能级 —— 纯度和性能特性经过优化。适用于普通等级无法满足的灵敏分析。 EnzymoPure™ ? EnzymoPure™ —— 阿拉丁的高质量酶解决方案系列。当酶纯度和明确活性决定检测或工艺性能时使用。 ≥20U/mg enzyme powder
Accession #
P0A393
生物活性
≥20U/mg enzyme powder
★
规格
库存
价格
数量
50U
L1493003-50U
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¥499.90
250U
L1493003-250U
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¥1,299.90
1KU
L1493003-1KU
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¥3,199.90
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为什么选择此级别

ActiBioPure™,EnzymoPure™,天然,生物活性,高性能 级 ,适用于对基线干扰要求严格的色谱和分析工作流程。

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储存与运输

-20°C储存,避免反复冻融。超低温运输 。请查阅批次 COA 获取详细规格。

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质量文档

SDS、COA、产品数据表及规格说明书均可下载。可通过批号查询获取批次 COA。

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文献证明

在色谱分析、有机合成和交叉偶联反应领域已被 0 篇同行评审文献引用。

概述


  Leucine Dehydrogenase is a member of the amino acid dehydrogenase family. Leucine Dehydrogenase is a nicotinamide adenine dinucleotide hydrogen (NADH)-dependent oxidoreductase. It is involved in catalyzing the reductive amination of aliphatic 2-oxo-acids to their respective L-amino acids.

PREPARATION and SPECIFICATION

Appearance:White amorphous powder, lyophilized
Activity:≥20U/mg enzyme powder (containing approx. 70 % of stabilizers) 
Contaminants:Leucylpeptide decomposing enzymes
(Leu-Val):≤1.0×10⁻²%
(Leu-Gly-Gly):≤1.0×10⁻²%
NADH oxidase:≤ 1.0×10⁻²%
Stabilizers:2-Mercaptoethanol, L-cysteine, dithiothreitol, ethylenediaminetetraacetate

PROPERTIES

StabilityStable at −20 ℃ for at least one year(Fig1)
Molecular weight245,000
Michaelis constants1.0×10⁻³ M (L-Leucine), 3.9×10⁻⁴ M (NAD⁺), 3.5×10⁻⁵ M (NADH), 3.1×10⁻⁴ M [α-Ketoisocaproate (α-KIC)], 2.0×10⁻¹ M (NH₃)
Structure6 subunits per enzyme molecule
InhibitorsNa₂S, Hg²⁺, Cu²⁺, Co²⁺, Mg²⁺, p-chloromercuribenzoate
Optimum pH10.5–10.8 (L-Leu→α-KIC), 9.4 (α-KIC→L-Leu)(Fig3)
Optimum temperatureabove 70 ℃(Fig4)
pH StabilitypH 5.5–10.5 (25 ℃, 20 hr)(Fig5)
Thermal stabilitybelow 60 ℃ (pH 6.9, 10 min)(Fig6)
Substrate specificity(Table 1)

APPLICATIONS

  This enzyme is useful for enzymatic measurement of L-leucine and the activity of leucine amino-peptidase.

ASSAY

1. Principle

The formation of NADH is measured at 340 nm by spectrophotometry.

2. Unit definition

One unit causes the formation of one micromole of NADH per minute under the conditions detailed below.

3. Method

3.1 Reagents

A. L-Leucine solution: 20mM L-leucine in 0.2M glycine-KCl-KOH buffer, pH 10.5 (Prepare freshly)

B. NAD⁺ solution: 12.5mM (Should be prepared fresh)

C. Enzyme diluent: 25mM K-phosphate buffer, pH 7.2

3.2 Procedure

① Prepare the following reaction mixture in a cuvette (d=1.0cm) and equilibrate at 37 ℃ for approximately 5 minutes.

3.0 mLSubstrate solution(A)
0.3 mLNAD⁺ solution
(B)

Concentration in assay mixture

Glycine buffer0.18 M
L -Leucine18 mM
NAD⁺
1.1mM

② Add 0.05 mL of the enzyme solution* and mix by gentle inversion.

③ Record the increase in optical density at 340 nm against water for 2 to 3 minutes with a spectrophotometer thermostated at 37 ℃, and calculate the ΔOD per minute from the initial linear portion of the curve (ΔOD test).

At the same time, measure the blank rate (ΔOD blank) using the same method as the test except that the enzyme diluent (C) is added instead of the enzyme solution.

*Dissolve the enzyme preparation in ice-cold enzyme diluent (C) (approx. 5 mg/mL) and dilute to 0.25−0.33 U/mL with the same buffer, immediately before the assay.

3.3 Calculation

Activity can be calculated by using the following formula:


Vt: Total volume (3.35 mL)
Vs: Sample volume (0.05 mL)
6.22: Millimolar extinction coefficient of NADH (cm²/micromole)
1.0: Light path length (cm)
df: Dilution factor
C: Enzyme concentration in dissolution (c mg/mL)

Table 1. Substrate Specificity of Leucine dehydrogenase

Substrate(10mM)Relative activity(%)Substrate(10mM)Relative activity(%)
L-Leucine100α-Ketoisocaproate100
L-Valine74α-Ketoisovalerate126
L-Isoleucine58α-Ketovalerate76
L-Norvaline41α-Ketobutyrate57
L-Norleucine10α-Ketocaproate46
L-Methionine0.6Inert: Pyruvate, α-Ketoglutarate, Phenylpyruvate, Oxaloacetate, Glyoxylate
L-Cysteine0.3
Inert: L-Ala, L-Glu, L-Thr, L-Ser, Gly, L-Phe, L-Lys, L-Arg, D-Leu, D-Val, D-Ile

规格

产品名称
亮氨酸脱氢酶 来源于芽孢杆菌属
别名
L-亮氨酸脱氢酶
英文别名
L-Leucine Dehydrogenase | L-Leucine:NAD+ oxidoreductase (deaminating) | LeuDH | dehydrogenase, leucine | LDH
规格或纯度
生物活性, ActiBioPure™, 天然, 高性能, EnzymoPure™, ≥20U/mg enzyme powder
生化机理
Catalyzes the reversible deamination of L-leucine to 4-methyl-2-oxopentanoate.
生物活性
≥20U/mg enzyme powder
种属
芽孢杆菌属(Bacillus sp.)
氨基酸
245 kDa
来源
天然
CAS编号和信息
9082-71-7
酶学委员会编号
EC 1.4.1.9
分子类型
酶
产品线
生物产品
储存与运输
物理形态
冻干(Lyophilized)
浓度
≥20U/mg enzyme powder
复溶
Reconstitute in 25 mM K-phosphate buffer, pH 7.2.
储存条件
-20°C储存,避免反复冻融
运输条件
超低温运输
稳定性与储存
长期储存-20℃(12个月);复溶后建议分装,避免反复冻融。
单位定义
One unit causes the formation of one micromole of NADH per minute under the conditions detailed below.

技术文档

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高级数据

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批号(Lot Number) 证书类型 货号
ZJ26F0434291 分析证书 L1493003
ZJ26F0434303 分析证书 L1493003
ZJ26F0434290 分析证书 L1493003
技术文档和文章
溶液计算器