Effects of Salts on Internal DNA Pressure and Mechanical Properties of Phage Capsids.

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Abstract

Based on atomic force microscopy nanoindentation measurements of phage λ, we previously proposed a minimal model describing the effect of water hydrating DNA that strengthens viral capsids against external deformation at wild-type DNA packing density. Here, we report proof of this model by testing the prediction that DNA hydration forces can be dramatically decreased by addition of multivalent ions (Mg(2+) and Sp(4+)). These results are explained using a DNA hydration model without adjustable parameters. The model also predicts the stiffness of other DNA-filled capsids, which we confirm using bacteriophage ϕ29 and herpes simplex virus type 1 particles.

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Subject classification (UKÄ) – MANDATORY

  • Physical Chemistry
  • Biological Sciences
Original languageEnglish
Pages (from-to)18-23
JournalJournal of Molecular Biology
Volume405
Publication statusPublished - 2011
Publication categoryResearch
Peer-reviewedYes