Anomalous diffusion of DNA on a supported cationic lipid membrane
1 Institute of Physics, Academia Sinica - Taipei, Taiwan 11529
2 Department of Physics, National Central University - Jhongli, Taiwan 32001
Received: 11 November 2014
Accepted: 21 January 2015
We used fluorescence microscopy to investigate the diffusion dynamics of individual DNA molecules on supported cationic lipid membranes. The mean-squared displacement of DNA on the membrane surface showed sub-diffusion associated with a slower DNA conformational relaxation at a short time scale. The evolution of contours of these non-entangled DNA at this short time scale was retained within a “hypothetical tube” of diameter . Inhomogeneous DNA-surface interaction along the DNA contour, identified by total internal reflection fluorescence microscopy, suggested a mechanism for the anomalous dynamics of DNA on the membrane.
PACS: 82.35.Gh – Polymers on surfaces; adhesion / 87.15.H- – Dynamics of biomolecules / 87.14.gk – DNA
© EPLA, 2015