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Chemistry

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Chemistry

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Biochemistry

Protein Interaction Capture Methods in Cells

Description

Co-immunoprecipitation and pull-down assays are laboratory methods used to capture stable protein-protein interactions. Protein-protein interactions help control many biological functions, but many of them have not yet been identified. These assays are related to immunoprecipitation, which isolates a target protein from a mi...

Transcript

蛋白质-蛋白质相互作用在多种生物学功能中发挥着重要作用。目前大多数蛋白质-蛋白质相互作用及其生物学效应仍有待鉴定。免疫共沉淀(Co-immunoprecipitation,简称 CoIP)和拉下实验(pull-down assay)是两种密切相关的方法,可用于鉴定稳定的蛋白质-蛋白质相互作用。本视频将介绍这两种实验方法的原理、通用实验操作流程以及这些技术的应用。

共免疫沉淀(CoIP)和拉下实验是免疫沉淀的变体,后者是一种从复杂溶液中选择性分离特定蛋白质的方法。在免疫沉淀实验中,使用针对目标蛋白质的特异性抗体,使其在样品中与该目标蛋白形成免疫复合物。随后,该复合物被固定在固相支持物上,通常是结合了蛋白A的葡聚糖珠(sepharose bead)。未结合的蛋白质通过离心步骤被...

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