Multiplex analysis of enzyme kinetics and inhibition by droplet microfluidics using picoinjectors
2013 (English)In: Lab on a Chip, ISSN 1473-0197, E-ISSN 1473-0189, Vol. 13, no 9, 1754-1761 p.Article in journal (Refereed) Published
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 (K-m), the turnover number (k(cat)) and the enzyme inhibitor dissociation constants (k(i), k(i)'). Using this device we determine K-m and k(cat) for beta-galactosidase and the fluorogenic substrate Resorufin beta-D-galactopyranoside (RBG) to be 442 mu M and 1070 s(-1), respectively. Furthermore, we examine the inhibitory effects of isopropyl-beta-D-thiogalactopyranoside (IPTG) on beta-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.
Place, publisher, year, edition, pages
2013. Vol. 13, no 9, 1754-1761 p.
Beta-Galactosidase, Microchip, Systems, Assays, Chip, Flow
Biochemistry and Molecular Biology
IdentifiersURN: urn:nbn:se:kth:diva-121627DOI: 10.1039/c3lc41398eISI: 000316962700012ScopusID: 2-s2.0-84875790638OAI: oai:DiVA.org:kth-121627DiVA: diva2:619346
FunderScience for Life Laboratory - a national resource center for high-throughput molecular bioscience
QC 201305032013-05-032013-05-032015-01-29Bibliographically approved