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Expression, One-Step Purification, and Immobilization of HaloTagTM Fusion Proteins on Chloroalkane-Functionalized Magnetic Beads

Abstract

The presented work introduces a novel method to immobilize enzymes either purified or directly out of a crude extract onto magnetic particles in the micrometer range. This method is based on the creation of a fusion protein consisting of the enzyme of choice and a mutant dehalogenase. The dehalogenase gene is commercially available from the company Promega under the name HaloTagTM. When the fusion protein is contacted with magnetic beads having chemically synthesized, chloroalkane ligands on their surface, the dehalogenase and the ligand undergo a covalent coupling leading to stable and spatially defined immobilization. The principle was proved with a lipase fused to the HaloTagTM gene and magnetic poly(methyl)methacrylate beads as carriers. The solubility of the tagged lipase was strongly increased by fusion of the malE gene at the N-terminal end of the HaloTagTM lipase gene. This tripartite protein was purified on amylose resin and used for immobilization. About 13 µg protein could be immobilized per 1 mg of beads within a few minutes. Due to the defined binding site, no activity loss was observed in the course of the immobilization. The resulting enzyme carrier was tested with the same beads up to six times for lipase activity over a storage period of 36 days at 8 °C. No loss of activity was found during this time.

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Acknowledgment

The authors want to thank Prof. Rainer Köster for his valuable contributions to several discussions of the synthesis and functionalization of polymer beads.

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Correspondence to Matthias Franzreb.

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Motejadded, H., Kranz, B., Berensmeier, S. et al. Expression, One-Step Purification, and Immobilization of HaloTagTM Fusion Proteins on Chloroalkane-Functionalized Magnetic Beads. Appl Biochem Biotechnol 162, 2098–2110 (2010). https://doi.org/10.1007/s12010-010-8985-1

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  • DOI: https://doi.org/10.1007/s12010-010-8985-1

Keywords

  • Enzyme immobilization
  • HaloTag™
  • Fusion protein
  • Magnetic bead
  • Dehalogenase
  • Expression