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Reference: Geertz M, et al. (2012) Massively parallel measurements of molecular interaction kinetics on a microfluidic platform. Proc Natl Acad Sci U S A 109(41):16540-5

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Abstract


Quantitative biology requires quantitative data. No high-throughput technologies exist capable of obtaining several hundred independent kinetic binding measurements in a single experiment. We present an integrated microfluidic device (k-MITOMI) for the simultaneous kinetic characterization of 768 biomolecular interactions. We applied k-MITOMI to the kinetic analysis of transcription factor (TF)-DNA interactions, measuring the detailed kinetic landscapes of the mouse TF Zif268, and the yeast TFs Tye7p, Yox1p, and Tbf1p. We demonstrated the integrated nature of k-MITOMI by expressing, purifying, and characterizing 27 additional yeast transcription factors in parallel on a single device. Overall, we obtained 2,388 association and dissociation curves of 223 unique molecular interactions with equilibrium dissociation constants ranging from 2 ? 10(-6) M to 2 ? 10(-9) M, and dissociation rate constants of approximately 6 s(-1) to 8.5 ? 10(-3) s(-1). Association rate constants were uniform across 3 TF families, ranging from 3.7 ? 10(6) M(-1) s(-1) to 9.6 ? 10(7) M(-1) s(-1), and are well below the diffusion limit. We expect that k-MITOMI will contribute to our quantitative understanding of biological systems and accelerate the development and characterization of engineered systems.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Geertz M, Shore D, Maerkl SJ
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