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Issue 21, 2013
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Protein–DNA force assay in a microfluidic format

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The detailed study of protein–DNA interactions is a core effort to elucidate physiological processes, including gene regulation, DNA repair and the immune response. The molecular force assay (MFA) is an established method to study DNA-binding proteins. In particular, high-affinity binder dissociation is made possible by the application of force. Microfluidic lab-on-a-chip approaches have proven helpful for parallelization, small sample volumes, reproducibility, and low cost. We report the successful combination of these two principles, forming a microfluidic molecular force assay and representing a novel use for the established MITOMI chip design. We present, characterize, validate and apply this integrated method. An alternative confocal fluorescence microscopy readout and analysis method is introduced and validated. In a multiplexing application, EcoRI binding is detected and characterized. This method paves the way for quantitative on-chip force measurements. It is suited for integration with DNA micro-spotting and in vitro expression of transcription factors to form a high-throughput chip for detailed DNA–protein interaction studies.

Graphical abstract: Protein–DNA force assay in a microfluidic format

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Publication details

The article was received on 12 Jul 2013, accepted on 02 Aug 2013 and first published on 29 Aug 2013

Article type: Paper
DOI: 10.1039/C3LC50830G
Lab Chip, 2013,13, 4198-4204

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    Protein–DNA force assay in a microfluidic format

    M. Otten, P. Wolf and H. E. Gaub, Lab Chip, 2013, 13, 4198
    DOI: 10.1039/C3LC50830G

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