Analysis of Tagged Proteins Using Tandem Affinity-Buffer Exchange Chromatography Online with Native Mass Spectrometry.
Analysis of Tagged Proteins Using Tandem Affinity-Buffer Exchange Chromatography Online with Native Mass Spectrometry.
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DOI:
10.1021/acs.biochem.1c00138
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发表时间:
2021-06-22
期刊:
影响因子:
2.9
通讯作者:
Wysocki, Vicki H.
中科院分区:
文献类型:
--
作者:
Busch, Florian;VanAernum, Zachary L.;Lai, Stella M.;Gopalan, Venkat;Wysocki, Vicki H.
Protein overexpression and purification are critical for in vitro structure–function characterization studies. However, some proteins are difficult to express in heterologous systems due to host-related (e.g., codon usage, translation rate) and/or protein-specific (e.g., toxicity, aggregation) challenges. Therefore, it is often necessary to test multiple overexpression and purification conditions to maximize the yield of functional protein, particularly for resource-heavy downstream applications (e.g., biocatalysts, tertiary structure determination, biotherapeutics). Here, we describe an automatable liquid chromatography–mass spectrometry-based method for direct analysis of target proteins in cell lysates. This approach is facilitated by coupling immobilized metal affinity chromatography (IMAC), which leverages engineered poly-histidine tags in proteins of interest, with size exclusion-based online buffer exchange (OBE) and native mass spectrometry (nMS). While we illustrate a proof of concept here using relatively straightforward examples, the use of IMAC–OBE–nMS to optimize conditions for large-scale protein production may become invaluable for expediting structural biology and biotherapeutic initiatives.
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