Abstract
The value of coupling biological molecules such as enzymes to solid materials has long been recognized. To date, protein immobilization onto such surfaces often involves covalent coupling, encapsulation, or non-specific adsorption techniques. Here we demonstrate the feasibility of specifically attaching a haloalkane dehalogenase enzyme to silica-coated or uncoated iron oxide superparamagnetic nanoparticles using affinity peptides. The enzyme was cloned from Xanthobacter autotrophicus strain GJ10 into Escherichia coli to produce fusion proteins containing dehalogenase sequences with C-terminal polypeptide repeats that have specific affinity for either silica or iron oxide. The fusion proteins serve dual functions, allowing for specific inorganic surface binding and for enzymatic activity. The degree of fusion protein adsorption to nanoparticle surfaces was found to exceed that of enzymes that had not been activated with affinity sequences, particularly for iron-oxide nanoparticles. The ability to specifically adsorb cloned affinity-tagged dehalogenase was further demonstrated by selectively adsorbing dehalogenase fusion proteins containing an iron-oxide affinity tripeptide directly from cell lysate. The retention of enzymatic activity was found to be dependent upon the surface chemistry of the nanoparticles. An increase in activity was observed after adsorption of fusion proteins onto the surface of nanoparticles modified by treatment with hydrophilic polyethylene glycol or 3-glycidoxypropyltrimethoxysilane molecules. As a result of this work, it is possible to tag an active enzyme with specific peptides that bind to inorganic nanoparticle surfaces. Because the conjugates self assemble, the novel surface-specific conjugate formation procedure is highly efficient and easily scalable for use in large-scale applications.
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Acknowledgements
This research was funded by grants from the M. J. Murdock Charitable Trust (grant #2005123JVZ), the Idaho EPSCoR Program (grant #EPS0132626), and the Idaho INBRE Program (NIH grant #P20 RR016454). We express appreciation to Franklin Bailey from the Electron Microscopy Center at the University of Idaho; we thank Cornelia Sawatzky for editorial assistance.
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Andrew K. Johnson and Anna M. Zawadzka contributed equally to this work.
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Johnson, A.K., Zawadzka, A.M., Deobald, L.A. et al. Novel method for immobilization of enzymes to magnetic nanoparticles. J Nanopart Res 10, 1009–1025 (2008). https://doi.org/10.1007/s11051-007-9332-5
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DOI: https://doi.org/10.1007/s11051-007-9332-5