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Phospho-Ubiquitin (pS65), PAb

磷酸泛素(pS65),PAb

Company: EMD Millipore
Catalog#: A-110
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Non-radioactive in vitro PINK1 Kinase Assays Using Ubiquitin or Parkin as Substrate
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2016-10-05
[Abstract]  This protocol describes the in vitro phosphorylation of ubiquitin and Parkin by the kinase PINK1 using recombinant proteins. Both substrates, ubiquitin and Parkin, are phosphorylated at the conserved serine 65 residue (pS65-ubiquitin and pS65-Parkin). The protocol also includes the use of monomeric and K48- and K63-linked poly-ubiquitin chains as alternative substrates. Although there are commercially available antibodies, we have not tested their performance in this assay since, but used validated antibodies from our laboratory. An alternative antibody-independent method, the use of phos-tag gels to detect pS65-ubiquitin and pS65-Parkin, is described in addition. [摘要]  该协议描述了通过激酶PINK1使用重组蛋白的泛素和帕金蛋白的体外磷酸化。两种底物,泛素和帕金蛋白,在保守的丝氨酸65残基(pS65-泛素和pS65-帕金蛋白)上磷酸化。该方案还包括使用单体和K48和K63连接的聚泛素链作为替代底物。虽然有市售的抗体,我们没有测试他们在这个测定中的性能,因为,但使用我们实验室的验证抗体。另外描述了另一种抗体非依赖性方法,使用phos-标记凝胶检测pS65-泛素和pS65-帕金。

[背景] 在细胞中, PINK1是稳定和激活的线粒体膜去极化和其他形式的应力,导致线粒体损伤。活化的PINK1磷酸化泛素,其作为线粒体表面上胞质E3泛素连接酶Parkin的受体。 Parkin对PINK1的磷酸化是Parkin对线粒体底物的完全活性所必需的。活性pS65-Parkin的存在在前馈机制中扩增了作为线粒体标记的线粒体上的pS65-泛素的量。最终,受损的线粒体被自噬噬菌体衔接子识别,并将被蛋白酶体和自噬(mitophagy)降解。这种关键的线粒体质量控制通路促进线粒体的周转,并防止可导致细胞变性的功能障碍线粒体的积累。 PINK1或Parkin中的功能缺失突变与早发性帕金森病相关。
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