Isolation of Protein Complexes from Tobacco Leaves by a Two‐Step Tandem Affinity Purification

烟草 串联亲和纯化 蛋白质纯化 标志标签 农业渗透 烟草花叶病毒 亲和层析 生物化学 生物 效应器 蛋白质标签 蛋白质-蛋白质相互作用 烟草 细胞生物学 计算生物学 化学 融合蛋白 重组DNA 遗传学 基因 病毒 茄科
作者
Raoul Martin,Furong Liu,Brian J. Staskawicz
出处
期刊:Current protocols [Wiley]
卷期号:2 (10) 被引量:2
标识
DOI:10.1002/cpz1.572
摘要

Protein purification is an essential method for understanding protein function, as many biochemical and structural techniques require a high concentration of isolated protein for analysis. Yet, many studies of protein complexes are hampered by our inability to express them recombinantly in model systems, generally due to poor expression or aggregation. When studying a protein complex that requires its host cellular environment for proper expression and folding, endogenous purification is typically required. Depending on the protein of interest, however, endogenous purification can be challenging because of low expression levels in the host and lack of knowledge working with a non-model expression system, resulting in yields that are too low for subsequent analysis. Here, we describe a protocol for the purification of protein complexes endogenous to Nicotiana benthamiana directly from leaf tissue, with yields that enable structural and biochemical characterization. The protein complex is overexpressed in Nicotiana benthamiana leaves via agroinfiltration, and the protein-packed leaves are then mechanically ground to release the complex from the cells. The protein complex is finally purified by a simple two-step tandem affinity purification using distinct affinity tags for each complex member, to ensure purification of the assembled complex. Our method yields enough protein for various biochemical or structural studies. We have previously used this protocol to purify the complex formed by an innate immune receptor native to tobacco, ROQ1, and the Xanthomonas effector XopQ, and to solve its structure by single-particle cryo-electron microscopy-we use this example to illustrate the approach. This protocol may serve as a template for the purification of proteins from N. benthamiana that require the plant's cellular environment and are expressed at low levels. © 2022 Wiley Periodicals LLC. Basic Protocol 1: Expression of the protein complex in leaf tissue Basic Protocol 2: Tandem affinity purification of the ROQ1-XopQ complex.
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