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Product details
名称
重组内切-β-半乳糖苷酶 (BfEndoβGal)
别名
内-β-半乳糖苷酶
英文别名
keratan-sulfate endo-1,4-beta-galactosidase | endo-beta-galactosidase | β-Galactosidase | BfEndoβGal
货号
E755085-100U
包装规格
100U
级别
生物活性
浓度
≥1000 U/mg protein
产品介绍
内切-β-半乳糖苷酶,E.C.:3.2.1.103,来源于 Bacteroides fragilis,内切β-半乳糖苷酶在大肠杆菌中重组表达的,是一种水解聚 n -乙酰乳胺结构中低聚糖(LNnT)内部β-半乳糖苷键的酶。对牛角膜硫酸角蛋白、牛奶低聚糖和糖脂类乳酸-n -新四糖基神经酰胺和乳酸-n -四糖基神经酰胺具有特异性。 使用方法 1.在反应体系中依次加入底物,50 mM 醋酸钠, pH 5.8,加入 5 mM CaCl2 混匀,加入适量内切-β-半乳糖苷酶。 用去离子水定容到反应体积。 2.将样品置于 37℃孵育 2-4 小时或者过夜。 【注】体系放大时候,孵育时间或酶量需要根据实际情况调整,可低速震荡混匀,可以增加转化率。 注意事项 为了您的安全和健康,请穿实验服并戴一次性手套操作。本产品仅作科研用途!
生化机理
未分枝的重复聚乙酰乳糖胺中的内部β(1-4)半乳糖连接[GlcNAc β(1-3)Gal β (1-4)] 结构是优选的底物。诸如硫酸角质素的硫酸化结构也会被裂解。底物的支化或岩藻糖基化可减少或完全抑制裂解。半乳糖上C-6的硫酸化将阻断裂解。取决于与优选底物的偏差,新乳酸基团的低聚糖会以极低的速率而被裂解。例如,Gal β(1-3)GlcNAc β(1-3) Gal β(1-4)Glc会以硫酸角质素5X10的速率而被裂解β-半乳糖苷酶可将乳糖切割成单糖成分、葡萄糖和半乳糖。它还在反馈环中催化葡萄糖转糖基化为β-半乳糖苷酶的诱导物异乳糖。
生物活性
≥1000 U/mg protein,单位定义:在37℃, pH 5.8 条件下,每小时从LNnT 中释放 1nmol还原糖的酶量。
来源
重组表达
蛋白标签
N-His
SDS-PAGE
36 kDa
表达系统
E. coli
种属
伊丽莎白病(Elizabethkingia miricola)
Safety
「No Dangerous Attributes」
Related
「No upstream and downstream information yet」
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Research chemical

Research chemical; supplied for laboratory research, analysis, inspection, and scientific procurement use.

item number:E755085-100U
Product model:100U
level: biological activity
Lead Time:30days
sold 280 Items
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100U

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