Methods and compositions for tagging via azido substrates
    31.
    发明申请
    Methods and compositions for tagging via azido substrates 失效
    通过叠氮底物标记的方法和组合物

    公开(公告)号:US20050106627A1

    公开(公告)日:2005-05-19

    申请号:US10715329

    申请日:2003-11-17

    IPC分类号: C12P19/60 G01N33/53 G01N33/68

    摘要: The invention provides methods and compositions for azide tagging of biomolecules. In one embodiment of the invention, proteins are tagged by metabolic incorporation of prenylated azido-analog substrates. Examples of such analogs are azido famesyl diphosphate and azido famesyl alcohol. The azido moiety in the resulting modified proteins provides an affinity tag, which can be chemoselectively captured by an azide-specific conjugation reaction, such as the Staudinger reaction, using a phosphine capture reagent. When the capture agent is biotinylated, the resulting conjugates can be detected and affinity-purified by streptavidin-linked-HRP and streptavidin-conjugated agarose beads, respectively. The invention allows detection and isolation of proteins with high yield, high specificity, and low contamination without harsh treatment of proteins.

    摘要翻译: 本发明提供了用于生物分子的叠氮标签的方法和组合物。 在本发明的一个实施方案中,蛋白质通过代谢并入预先化合的叠氮基 - 类似物底物进行标记。 这种类似物的实例是叠氮基法甲基二磷酸酯和叠氮基茴香醇。 得到的修饰蛋白质中的叠氮基部分提供亲和标签,其可以使用磷化氢捕获试剂通过叠氮化物特异性缀合反应(例如Staudinger反应)进行化学选择性捕获。 当捕获剂被生物素化时,可以分别通过链霉亲和素连接的HRP和链霉抗生物素蛋白缀合的琼脂糖珠分别检测所得的缀合物并进行亲和纯化。 本发明允许以高产量,高特异性和低污染物检测和分离蛋白质,而不严格地处理蛋白质。

    PROPIONYL AND BUTYRYL LYSINE MODIFICATIONS IN PROTEINS
    35.
    发明申请
    PROPIONYL AND BUTYRYL LYSINE MODIFICATIONS IN PROTEINS 审中-公开
    蛋白质中的丙酸和丁基赖氨酸修饰

    公开(公告)号:US20080241862A1

    公开(公告)日:2008-10-02

    申请号:US12021960

    申请日:2008-01-29

    摘要: While the identification of acetylated lysine residues on proteins is well-known, the modification of lysine residues through propionylation and butyrylation is not very well understood. A method for the identification and mapping of propionylated and butyrylated lysine residues has been developed. Anti-acetyllysine antibody, normally used to affinity purify a protein mixture based on the presence of acetylated lysine, can also be used to affinity purity proteins having propionylated and butyrylated lysine residues due to the structural similarity. The method involves searching protein databases to locate mass spectrometry datasets for those proteins purified by anti-acetyllysine antibody. The located spectra are manually reviewed to identify those peptides having propionyllysine and butyryllysine residues. These identified peptides are synthesized, with the lysine modifications added at the appropriate positions. The synthesized proteins are then analyzed with mass spectrometry and the resultant spectra are compared to those located in the protein databases to confirm the location of the lysine modifications.

    摘要翻译: 虽然蛋白质上的乙酰化赖氨酸残基的鉴定是众所周知的,但是通过丙酰化和丁酰化修饰赖氨酸残基不是很好地理解。 已经开发了用于鉴定和测定丙酰化和丁酰化赖氨酸残基的方法。 通常用于亲和纯化基于乙酰化赖氨酸存在的蛋白质混合物的抗乙酰赖氨酸抗体也可用于由于结构相似性而具有丙酰化和丁酰化赖氨酸残基的亲和纯度蛋白质。 该方法包括搜索蛋白质数据库来定位由抗乙酰赖氨酸抗体纯化的蛋白质的质谱数据集。 手工检查定位的光谱,以鉴定具有丙酰赖氨酸和丁酰赖氨酸残基的那些肽。 合成这些鉴定的肽,其中在适当位置加入赖氨酸修饰。 然后通过质谱分析合成的蛋白质,并将所得光谱与位于蛋白质数据库中的蛋白质进行比较,以确认赖氨酸修饰的位置。