文章基本信息

标题：Development of a yeast internal-subunit eGFP labeling strategy and its application in subunit identification in eukaryotic group II chaperonin TRiC/CCT
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作者：Yunxiang Zang ; Huping Wang ; Zhicheng Cui 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2018
卷号：8
期号：1
页码：2374
DOI：10.1038/s41598-017-18962-y
语种：English
出版社：Springer Nature
摘要：Unambiguous subunit assignment in a multicomponent complex is critical for thorough understanding of the machinery and its functionality. The eukaryotic group II chaperonin TRiC/CCT folds approximately 10% of cytosolic proteins and is important for the maintenance of cellular homeostasis. TRiC consists of two rings and each ring has eight homologous but distinct subunits. Unambiguous subunit identification of a macromolecular machine such as TRiC through intermediate or low-resolution cryo-EM map remains challenging. Here we present a yeast internal-subunit eGFP labeling strategy termed YISEL, which can quickly introduce an eGFP tag in the internal position of a target subunit by homologous recombination, and the tag labeled protein can be expressed in endogenous level. Through this method, the labeling efficiency and tag-occupancy is ensured, and the inserted tag is usually less mobile compared to that fused to the terminus. It can also be used to bio-engineer other tag in the internal position of a protein in yeast. By applying our YISEL strategy and combined with cryo-EM 3D reconstruction, we unambiguously identified all the subunits in the cryo-EM map of TRiC, demonstrating the potential for broad application of this strategy in accurate and efficient subunit identification in other challenging complexes.