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Merck
CN

G6641

葡萄糖氧化酶 来源于黑曲霉

Type II-S, 15,000-50,000 units/g solid (without added oxygen)

别名:

G.Od., β-D-葡萄糖:氧 1-氧化还原酶, GOx

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化学文摘社编号:
EC Number:
232-601-0
UNSPSC Code:
12352204
MDL number:
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InChI key

WQZGKKKJIJFFOK-VFUOTHLCSA-N

InChI

1S/C6H12O6/c7-1-2-3(8)4(9)5(10)6(11)12-2/h2-11H,1H2/t2-,3-,4+,5-,6-/m1/s1

type

Type II-S

form

powder

specific activity

15,000-50,000 units/g solid (without added oxygen)

mol wt

160 kDa

composition

, 20-40%

foreign activity

Catalase ≤10 Sigma units/mg protein, Maltase ≤10%, amylase ≤0.5%, galactose oxidase 0.5 - 4.0%, glycogenase ≤0.5%, invertase ≤0.5%

storage temp.

−20°C

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General description

分子量:160 kDa(凝胶过滤)
pI: 1865
消光系数:E1% = 16.7 (280 nm)

来自黑曲霉的葡萄糖氧化酶是由 2 个相等的亚基组成的二聚体,每个亚基的分子量为 80kDa。每个亚基含有一个黄素腺嘌呤二核苷酸部分和一个铁。该酶是含有 ~16% 中性糖和 2% 氨基糖的糖蛋白。该酶还含有 3 个半胱氨酸残基和 8 个 N-连接糖基化的潜在位点。

葡萄糖氧化酶能够以不同的速率氧化 D-己醛糖、单脱氧-D-葡萄糖和甲基-D-葡萄糖。

葡萄糖氧化酶的最佳 pH 为 5.5,虽然它的活性范围很宽,pH 4-7葡萄糖氧化酶对β-D-葡萄糖具有特异性,KM为33-110mM。

葡萄糖氧化酶不需要任何活化剂,但它被Ag+、Hg2+、Cu2+、醋酸苯汞和对-氯甲基苯甲酸酯抑制。它不受非金属 SH 试剂的抑制:N-乙基马来酰亚胺、碘乙酸盐和碘乙酰胺。

葡萄糖氧化酶可用于酶法测定溶液中的 D-葡萄糖。由于葡萄糖氧化酶将β-D-葡萄糖氧化成D-葡糖酸内酯和过氧化氢,因此辣根过氧化物酶通常用作葡萄糖测定的偶联酶。尽管葡萄糖氧化酶对β-D-葡萄糖具有特异性,但是可以对D-葡萄糖溶液进行定量,因为当酶促反应消耗β-D-葡萄糖时,α-D-glucose葡萄糖将变为β-D-葡萄糖。

Application

葡萄糖氧化酶广泛用于食品和制药工业,以及葡萄糖生物传感器的主要组分。

Biochem/physiol Actions

葡萄糖氧化酶催化β-d-葡萄糖氧化成 d-葡糖酸-β-内酯和过氧化氢,分子氧作为电子受体。

Analysis Note

Protein determined by biuret.

Other Notes

在 pH 5.1,35℃ 下,一个单位每分钟将1.0 μmole的β-D-葡萄糖氧化成 D-葡糖酸内酯和 H2O2,相当于每分钟吸收22.4 μl O2。如果反应混合物被氧气饱和,则活性最多可增加 100%。

pictograms

Health hazard

signalword

Danger

hcodes

Hazard Classifications

Resp. Sens. 1

存储类别

11 - Combustible Solids

wgk

WGK 1

ppe

dust mask type N95 (US), Eyeshields, Faceshields, Gloves

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