Fluidification of entanglements by a DNA bending protein

Abstract

In spite of the nanoscale and single-molecule insights into how nucleoid associated proteins (NAPs) interact with DNA, their role in modulating the mesoscale viscoelasticity of the entangled genome in vivo has been overlooked so far. By combining microrheology and molecular dynamics simulation we find that the important NAP called Integration Host Factor (IHF) lowers the viscosity of entangled $\lambda$DNA 20-fold at physiological concentrations and stoichiometries. We argue that IHF may act as a "genomic fluidiser", reducing the effective viscosity of the nucleoid $\sim$200-fold. Our results suggest a previously unappreciated key role of IHF in regulating DNA dynamics and re-organisation in vivo

References in corpus (2)

• Differential Dynamic Microscopy: Probing wave vector dependent dynamics with a microscope
• Viscoelasticity and primitive path analysis of entangled polymer liquids: From f-actin to polyethylene

Cited by in corpus (2)

• Runaway Transition in Irreversible Polymer Condensation with Cyclisation
• Yeast condensin acts as a transient intermolecular crosslinker in entangled DNA