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名称

α-乳清蛋白

货号

L1456598-25mg

包装规格

25mg

浓度

≥90%(SDS-PAGE)

产品介绍

α-乳清蛋白是一种分子量较小的球状乳清蛋白，存在于迄今为止已研究的所有乳汁中。它是在乳腺中产生的约14kDa的金属蛋白。应用： α-从牛乳中提取的乳清蛋白作为补充剂，用于各种细胞培养的基础培养基。也已作为标记物，用于十二烷基硫酸钠-聚丙烯酰胺凝胶电泳（SDS-PAGE）。 α-Lactalbumin is a small, globular, whey protein that has been found in all milk studied to date. It is a metalloprotein of approximately 14 kDa produced in the mammary glands. Application: α-Lactalbumin from bovine milk has been used as a supplement of basal medium for various cell cultures. It has also been used as a marker for sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE).

生化机理

α-乳清蛋白是人乳汁中的主要蛋白。它由单个多肽链组成，含有通过二硫键连接的8个半胱氨酸。α-乳清蛋白可结合多种金属离子，包括钙，这一性质被认为在从还原的变性形式再生成天然α-乳清蛋白的过程中发挥重要作用。α-乳清蛋白还具有独特的锌结合位点，其被认为在乳糖合酶复合物的结合中发挥作用。成熟蛋白质由123个氨基酸残基（14kD）组成，并且具有1.7 Α°分辨率三维结构，含四个α-螺旋和三链反式平行β-折叠。其可通过改变半乳糖基转移酶的底物特异性以增加乳糖形成的速率；半乳糖基转移酶和α-乳白蛋白的复合物称为乳糖合酶。Asp87 或 Asp88 对 Ala 的定点诱变完全消除了强钙结合亲和力，并将乳糖合酶的刺激降低到最大速率的 <3.5%。

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