Abstract
Protein purification is a basic technology in both biological research and industrial production, and efficient, convenient, economical, and environmentally friendly purification methods have always been pursued. In this study, it was found that alkaline earth metal cations (Mg2+, Ca2+) and alkali metal cations (Li+, Na+, K+) and even nonmetal cations (e.g., NH4+, imidazole, guanidine, arginine, lysine) can precipitate multi-histidine-tagged proteins (at least two tags in a whole protein) at low salts concentrations that are 1–3 orders of magnitude lower than salting-out, and precipitated proteins could be dissolved at moderate concentration of corresponding cation. Based on this finding, a novel cation affinity purification method was developed, which requires only three centrifugal separations to obtain highly purified protein with purification fold similar to that of immobilized metal affinity chromatography. The study also provides a possible explanation for unexpected protein precipitation and reminds researchers to consider the influence of cations on the experimental results. The interaction between histidine-tagged proteins and cations may also have broad application prospects.
Key points
• Histidine-tagged proteins can be precipitated by low-concentrations common cations
• A novel nonchromatographic protein purification method was developed
• Purified protein can be obtained in pellet form by only three centrifugations
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All data generated or analyzed during this study are included in this published article and its supplementary information files.
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This work was financially supported by the National Natural Science Foundation of China (22078019).
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Conceptualization: HS and HL; formal analysis: HS and HW; funding acquisition: HL; investigation: HS, HW, QC, WD, CG, HS, HP, RL, HW, and LH; methodology: HS, HW, and HL; project administration: HL; supervision: YC and HL; validation: HS and HW; visualization: HS and HW; writing—original draft: HS; writing—review and editing: HS, YC, and HL.
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A patent application related to this work has been filed, in which HL, YC, HS, HW, and QC are named inventors. The other authors declare no conflict of interest.
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Sun, H., Wang, H., Chen, Q. et al. Cation affinity purification of histidine-tagged proteins. Appl Microbiol Biotechnol 107, 2639–2651 (2023). https://doi.org/10.1007/s00253-023-12425-3
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DOI: https://doi.org/10.1007/s00253-023-12425-3