Terminal supraparticle assemblies from similarly charged protein molecules and nanoparticles

Jai Il Park, Trung Dac Nguyen, Gleiciani de Queirós Silveira, Joong Hwan Bahng, Sudhanshu Srivastava, Gongpu Zhao, Kai Sun, Peijun Zhang, Sharon C. Glotzer () and Nicholas A. Kotov ()
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Jai Il Park: University of Michigan
Trung Dac Nguyen: University of Michigan
Gleiciani de Queirós Silveira: University of Michigan
Joong Hwan Bahng: Biomedical Engineering, University of Michigan
Sudhanshu Srivastava: University of Michigan
Gongpu Zhao: University of Pittsburgh School of Medicine
Kai Sun: Materials Science and Engineering, University of Michigan
Peijun Zhang: University of Pittsburgh School of Medicine
Sharon C. Glotzer: University of Michigan
Nicholas A. Kotov: University of Michigan

Nature Communications, 2014, vol. 5, issue 1, 1-9

Abstract: Abstract Self-assembly of proteins and inorganic nanoparticles into terminal assemblies makes possible a large family of uniformly sized hybrid colloids. These particles can be compared in terms of utility, versatility and multifunctionality to other known types of terminal assemblies. They are simple to make and offer theoretical tools for designing their structure and function. To demonstrate such assemblies, we combine cadmium telluride nanoparticles with cytochrome C protein and observe spontaneous formation of spherical supraparticles with a narrow size distribution. Such self-limiting behaviour originates from the competition between electrostatic repulsion and non-covalent attractive interactions. Experimental variation of supraparticle diameters for several assembly conditions matches predictions obtained in simulations. Similar to micelles, supraparticles can incorporate other biological components as exemplified by incorporation of nitrate reductase. Tight packing of nanoscale components enables effective charge and exciton transport in supraparticles and bionic combination of properties as demonstrated by enzymatic nitrate reduction initiated by light absorption in the nanoparticle.

Date: 2014
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DOI: 10.1038/ncomms4593

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