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In vitro gene expression and enzyme catalysis in bio-inorganic protocells

Li, Mei; Green, David C.; Anderson, J. L. Ross; Binks, Bernard P.; Mann, Stephen


Mei Li

David C. Green

J. L. Ross Anderson

Stephen Mann


Silica nanoparticles with a balance of hydrophilic and hydrophobic surface properties exhibit surfactant-like behaviour, and as a consequence can strongly adsorb at oil/water interfaces to stabilize the formation of water micro-droplets. Here we exploit this strategy to construct a model of a primitive bio-inorganic protocell, which unlike conventional paradigms based on self-assembled vesicles, is structurally delineated by a porous inorganic membrane rather than a lipid-based bilayer. As proof-ofprinciple we show that the nanoparticle-stabilized droplets (colloidosomes) can support a range of functionally active biomolecules and bio-machinery related to metabolic and informational processing. Specifically, we demonstrate that the rate of cell-free fluorescent protein (eGFP) is essentially the same within the colloidosome interior as in bulk aqueous solution. In addition, we report considerable enhancements in the specific activity of enzymes such as lipoprotein lipase, chymotrypsin or alkaline phosphatase when entrapped within the nanoparticlestabilized water droplets. Our results suggest that artificial protocells based on the construction of biological/inorganic nanoscale components could have considerable potential in areas such as synthetic biology and bionanotechnology. In a wider perspective, studies on bio-inorganic protocells could provide alternative models for evaluating potential prebiotic pathways prior to the emergence of lipidbased compartmentalization on the early Earth.

Journal Article Type Article
Publication Date 2011
Journal Chemical Science
Print ISSN 2041-6520
Electronic ISSN 2041-6539
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 2
Issue 9
Pages 1739-1745
APA6 Citation Li, M., Green, D. C., Anderson, J. L. R., Binks, B. P., & Mann, S. (2011). In vitro gene expression and enzyme catalysis in bio-inorganic protocells. Chemical science, 2(9), 1739-1745. doi:10.1039/c1sc00183c
Keywords General Chemistry
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