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Protein-surfactant-polysaccharide nanoparticles increase the catalytic activity of an engineered β-lactamase maltose-activated switch enzyme

Fuenzalida Werner, J. P.; xiong, T.; Moerschbacher, B. M.; Ostermeier, M.; Goycoolea, F. M.

2019-08-24 biochemistry
10.1101/746560 bioRxiv
Show abstract

We present polysaccharide-based nanoparticles able to associate and increase the catalytic activity of the maltose-binding MBP317-347 switch enzyme. Fluorescence quenching and molecular docking studies along with the partial resistance to increasing pH and ionic strength indicate that the increase in enzymatic activity is due to a specific interaction between the maltose binding pocket on MBP317-347 and alginate exposed on the surface of the nanoparticles. Finally, we show that the hybrid self co-assembled particles increase the half-life of MBP317-347 over six-fold at 37{degrees}C, thus reflecting their potential use as a macromolecular drug delivery system.

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