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Batch affinity adsorption of His-tagged proteins with EDTA-based chitosan

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Abstract

Affinity adsorption purification of hexahistidine-tagged (His-tagged) proteins using EDTA–chitosan-based adsorption was designed and carried out. Chitosan was elaborated with ethylenediaminetetraacetic acid (EDTA), and the resulting polymer was characterized by FTIR, TGA, and TEM. Different metals including Ni2+, Cu2+, and Zn2+ were immobilized with EDTA–chitosan, and their capability to the specific adsorption of His-tagged proteins were then investigated. The results showed that Ni2+–EDTA–chitosan and Zn2+–EDTA–chitosan had high affinity toward the His-tagged proteins, thus isolating them from protein mixture. The target fluorescent-labeled hexahistidine protein remained its fluorescent characteristic throughout the purification procedure when Zn2+–EDTA–chitosan was used as a sorbent, wherein the real-time monitor was performed to examine the immigration of fluorescent-labeled His-tagged protein. Comparatively, Zn2+–EDTA–chitosan showed more specific binding ability for the target protein, but with less binding capacity. It was further proved that this purification system could be recovered and reused at least for 5 times and could run on large scales. The presented M2+–EDTA–chitosan system, with the capability to specifically bind His-tagged proteins, make the purification of His-tagged proteins easy to handle, leaving out fussy preliminary treatment, and with the possibility of continuous processing and a reduction in operational cost in relation to the costs of conventional processes.

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Funding

This study was funded by the Natural Science Foundation of Zhejiang Province of China (Y3110204), the Technology Planning Project of Zhejiang Province of China (2011C12031), the National Science Foundation of China (21102129), and the Natural Key Technology R & D Program of China during the 12th Five-Year Plan Period (2012BAD29B06).

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This article does not contain any studies with human participants or animals performed by any of the authors.

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The authors declare that they have no competing interests.

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Correspondence to Jianying Huang.

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Hua, W., Lou, Y., Xu, W. et al. Batch affinity adsorption of His-tagged proteins with EDTA-based chitosan. Appl Microbiol Biotechnol 100, 879–891 (2016). https://doi.org/10.1007/s00253-015-7137-5

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  • DOI: https://doi.org/10.1007/s00253-015-7137-5

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