Abstract
Proteins purified using affinity-based chromatography often exploit a recombinant affinity tag. Existing methods for the removal of the extraneous tag, needed for many applications, suffer from poor efficiency and/or high cost. Here we describe a simple, efficient, and potentially low-cost approach—split intein-mediated ultrarapid purification (SIRP)—for both the purification of the desired tagged protein from Escherichia coli lysate and removal of the tag in less than 1 h. The N- and C-fragment of a self-cleaving variant of a naturally split DnaE intein from Nostoc punctiforme are genetically fused to the N-terminus of an affinity tag and a protein of interest (POI), respectively. The N-intein/affinity tag is used to functionalize an affinity resin. The high affinity between the N- and C-fragment of DnaE intein enables the POI to be purified from the lysate via affinity to the resin, and the intein-mediated C-terminal cleavage reaction causes tagless POI to be released into the flow-through. The intein cleavage reaction is strongly inhibited by divalent ions (e.g., Zn2+) under non-reducing conditions and is significantly enhanced by reducing conditions. The POI is cleaved efficiently regardless of the identity of the N-terminal amino acid except in the cases of threonine and proline, and the N-intein-functionalized affinity resin can be regenerated for multiple cycles of use.
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Acknowledgements
Funding for this work was provided by the Norman Hackerman Advanced Research Program, National Science Foundation and the Chemical Engineering Department at the Texas A&M University.
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Guan, D., Chen, Z. (2017). Affinity Purification of Proteins in Tag-Free Form: Split Intein-Mediated Ultrarapid Purification (SIRP). In: Mootz, H. (eds) Split Inteins. Methods in Molecular Biology, vol 1495. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-6451-2_1
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DOI: https://doi.org/10.1007/978-1-4939-6451-2_1
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