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Issue 9, 2013
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Multiplex analysis of enzyme kinetics and inhibition by droplet microfluidics using picoinjectors

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Abstract

Enzyme kinetics and inhibition is important for a wide range of disciplines including pharmacology, medicine and industrial bioprocess technology. We present a novel microdroplet-based device for extensive characterization of the reaction kinetics of enzyme substrate inhibitor systems in a single experiment utilizing an integrated droplet picoinjector for bioanalysis. This device enables the scanning of multiple fluorescently-barcoded inhibitor concentrations and substrate conditions in a single, highly time-resolved experiment yielding the Michaelis constant (Km), the turnover number (kcat) and the enzyme inhibitor dissociation constants (ki, ki′). Using this device we determine Km and kcat for β-galactosidase and the fluorogenic substrate Resorufin β-D-galactopyranoside (RBG) to be 442 μM and 1070 s−1, respectively. Furthermore, we examine the inhibitory effects of isopropyl-β-D-thiogalactopyranoside (IPTG) on β-galactosidase. This system has a number of potential applications, for example it could be used to screen inhibitors to pharmaceutically relevant enzymes and to characterize engineered enzyme variants for biofuels production, in both cases acquiring detailed information about the enzyme catalysis and enzyme inhibitor interaction at high throughput and low cost.

Graphical abstract: Multiplex analysis of enzyme kinetics and inhibition by droplet microfluidics using picoinjectors

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Publication details

The article was received on 20 Dec 2012, accepted on 12 Feb 2013 and first published on 13 Feb 2013


Article type: Paper
DOI: 10.1039/C3LC41398E
Lab Chip, 2013,13, 1754-1761

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    Multiplex analysis of enzyme kinetics and inhibition by droplet microfluidics using picoinjectors

    S. L. Sjostrom, H. N. Joensson and H. A. Svahn, Lab Chip, 2013, 13, 1754
    DOI: 10.1039/C3LC41398E

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