Affitins for protein purification by affinity magnetic fishing

⿢First time successfully use of Affitins as ligands in a non-chromatographic support.⿢Protein purification with magnetic beads functionalized with Affitins.⿢Optimization of ligand immobilization, binding and elution conditions.⿢Lysozyme and IgG purification with high purity. Currently most economica...

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Bibliographic Details
Published in:Journal of Chromatography A 2016-07, Vol.1457, p.50-58
Main Authors: Fernandes, Cláudia S.M., dos Santos, Raquel, Ottengy, Stella, Viecinski, Aline Canani, Béhar, Ghislaine, Mouratou, Barbara, Pecorari, Frédéric, Roque, A.Cecília A.
Format: Article
Language:English
Subjects:
Affinity
Affinity purification
Affitin
Antibodies
Binding
Cancer
Constants
Economics
Escherichia coli
Fishing
Life Sciences
Lysozyme
Magnetic fishing
Magnetic particles
Proteins
Purification
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Summary:⿢First time successfully use of Affitins as ligands in a non-chromatographic support.⿢Protein purification with magnetic beads functionalized with Affitins.⿢Optimization of ligand immobilization, binding and elution conditions.⿢Lysozyme and IgG purification with high purity. Currently most economical and technological bottlenecks in protein production are placed in the downstream processes. With the aim of increasing the efficiency and reducing the associated costs, various affinity ligands have been developed. Affitins are small, yet robust and easy to produce, proteins derived from the archaeal extremophilic ⿿7kDa DNA-binding⿿ protein family. By means of combinatorial protein engineering and ribosome display selection techniques, Affitins have shown to bind a diversity of targets. In this work, two previously developed Affitins (anti-lysozyme and anti-IgG) were immobilized onto magnetic particles to assess their potential for protein purification by magnetic fishing. The optimal lysozyme and human IgG binding conditions yielded 58mg lysozyme/g support and 165mgIgG/g support, respectively. The recovery of proteins was possible in high yield (⿥95%) and with high purity, namely⿿⿥95% and 81%, when recovering lysozyme from Escherichia coli supernatant and IgG from human plasma, respectively. Static binding studies indicated affinity constants of 5.0ÿ104M⿿1 and 9.3ÿ105M⿿1 for the anti-lysozyme and anti-IgG magnetic supports. This work demonstrated that Affitins, which can be virtually evolved for any protein of interest, can be coupled onto magnetic particles creating novel affinity adsorbents for purification by magnetic fishing.
ISSN:0021-9673
1873-3778
DOI:10.1016/j.chroma.2016.06.020