质量水平
类型
Type V
形式
lyophilized powder
比活
≥0.1 units/mg solid (using mucin)
≥1.3 units/mg solid (using 4MU-NANA)
应用
diagnostic assay manufacturing
异质活性
Protease and NAN-aldolase, present
运输
dry ice
储存温度
−20°C
基因信息
Clostridium perfringens str. 13 ... nanI(988807)
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相关类别
一般描述
神经氨酸酶是一种水解酶,其可促进流感病毒从感染细胞释放并促进病毒的传播。
应用
来自产气荚膜梭菌的神经氨酸酶已经用于评估神经氨酸酶预处理的绵羊中人T淋巴细胞的结合。 它也被用于研究胆汁盐对神经氨酸酶水解作用的影响。
生化/生理作用
使用神经氨酸酶去除细胞表面上糖蛋白的唾液酸残基已有多次报道。通常,实验步骤中会表明将神经氨酸酶在PBS中,37℃条件下孵育30分钟进行使用,然后用PBS洗涤几次。用浓度低得多的神经氨酸酶处理组织切片需要更长的温育时间:在pH 4.2-5的0.1M乙酸盐缓冲液中,对于1-4U/mL浓度,需要在37℃下孵育2-20小时。
利用神经氨酸酶裂解唾液酸基团已用来研究糖蛋白结构的抗体识别。与其他两种方法进行比较,使用神经氨酸酶可更好的对N-乙酰神经氨酸进行估测。
神经氨酸酶可以通过去除细胞表面上暴露的带负电荷的唾液酸残基来增加某些细胞系中的聚集。
神经氨酸酶可用于从多种糖蛋白中切割末端N-乙酰神经氨酸(唾液酸)。 来自产气荚膜梭菌的酶可切割末端唾液酸残基,这些残基可通过α-2,3-、α-2,6-或α-2,8-与Gal、GlcNac、GalNAc、AcNeu、GlcNeu、寡糖、糖脂或糖蛋白进行连接。切割的相对速率按以下顺序逐渐降低:α-2-3>α-2-6。α-2-8。与来自A. ureafaciens的神经氨酸酶(Sigma N3642)(优先切割α-2-6连接的残基)相比,来自产气荚膜梭菌的神经氨酸酶可最有效地切割α-2-3连接的唾液酸残基。
单位定义
在37°C、pH 5.0的条件下,一个单位每分钟可从牛下颌粘蛋白中释放1.0微摩尔的N-乙酰神经氨酸。以4MU-NANA为底物,
一个单位在37°C、pH 5.0的条件下,每分钟可释放1.0微摩尔的2′-(4-甲基伞形酮)-a-D-N-乙酰基神经氨酸。
一个单位在37°C、pH 5.0的条件下,每分钟可释放1.0微摩尔的2′-(4-甲基伞形酮)-a-D-N-乙酰基神经氨酸。
制备说明
其通过盐分馏进行制备。
分析说明
按照4MU-NANA单位进行包装
警示用语:
Danger
危险声明
预防措施声明
危险分类
Resp. Sens. 1
WGK
WGK 1
闪点(°F)
Not applicable
闪点(°C)
Not applicable
个人防护装备
Eyeshields, Gloves, type N95 (US)
法规信息
常规特殊物品
Practical laboratory medicine, 18, e00150-e00150 (2020-01-08)
A qualitative, semi-automatized method for apolipoprotein E (apoE) phenotyping by isoelectric focusing method has been evaluated on 40 serum samples from patients previously genotyped for apoE, especially as regards concordance with genotyping, but also repeatability and reproducibility of the method
Enhanced binding of neuraminidase-treated sheep erythrocytes to human T lymphocytes.
Blood, 42(6), 939-946 (1973-12-01)
The Journal of cell biology, 60(3), 641-652 (1974-03-01)
Aggregation of suspended HeLa cells is increased on removal of cell surface sialic acid. Calcium ions promote aggregation whereas magnesium ions have no effect. The calcium effect is abolished by previous treatment of the cells with neuraminidase. Trypsinization of the
Frontiers in immunology, 12, 661379-661379 (2021-06-11)
Influenza B viruses (IBV) cause respiratory disease epidemics in humans and are therefore components of seasonal influenza vaccines. Serological methods are employed to evaluate vaccine immunogenicity prior to licensure. However, classical methods to assess influenza vaccine immunogenicity such as the
The Biochemical journal, 193(1), 267-273 (1981-01-01)
Studies were done on the effect of bile salts on the rates of hydrolysis of the N-acetylneuraminyl linkages of several sialic acid-containing compounds by the neuraminidase of Clostridium perfringens. When GM3-ganglioside, two glycolipids (glycophorin and orosomucoid) and neuraminyl-lactose were used
商品
Understand sialic acid structure, function, signaling, and modifications. Easily find products for sialic acid research.
实验方案
Enzymatic Assay of Neuraminidase applies to products that have a specification for neuraminidase content by enzymatic determination.
在测定神经氨酸酶活性时,使用了一种以N-乙酰新胺酸为酶底物的比色法进行测定。神经氨酸酶是一种可促进流感病毒从感染细胞中释放的水解酶。
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