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名称

神经氨酸酶来源于产气荚膜梭菌（韦氏梭菌）

货号

N755098-4units

包装规格

4units

浓度

Type VI, lyophilized powder, 6-15 units/mg protein (using 4MU-NANA), 2-10 units/mg protein (mucin)

产品介绍

产气荚膜梭菌 (C. welchii) 的神经氨酸酶已用于评估适合用作制备试验底物的糖蛋白组分的研究。在一项研究中也被用来研究一种ε毒素对 MDCK 细胞的作用。应用：神经氨酸酶是水解酶，可促进流感病毒从感染细胞释放并促进病毒传播。 Neuraminidase enzymes are hydrolase enzymes that promote influenza virus release from infected cells and facilitate virus spread. Application: Neuraminidase from Clostridium perfringens (C. welchii) has been used in a study to assess a glycoprotein faction suitable for use as a substrate in preparation assays. It has also been used in a study to investigate the action of an epsilion-toxin on MDCK cells.

生化机理

产气荚膜梭菌的神经氨酸酶降低人白血病原始粒细胞的活力，减弱其激活淋巴细胞的能力。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。

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