Effect of Calcium Ions and Disulfide Bonds on Swelling of Virus Particles

Roi Asor, Daniel Khaykelson, Orly Ben-Nun-Shaul, Ariella Oppenheim, Uri Raviv*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Multivalent ions affect the structure and organization of virus nanoparticles. Wild-type simian virus 40 (wt SV40) is a nonenveloped virus belonging to the polyomavirus family, whose external diameter is 48.4 nm. Calcium ions and disulfide bonds are involved in the stabilization of its capsid and are playing a role in its assembly and disassembly pathways. Using solution small-angle X-ray scattering (SAXS), we found that the volume of wt SV40 swelled by about 17% when both of its calcium ions were chelated by ethylene glycol-bis(2-aminoethylether)-N,N,N′,N′-tetraacetic acid and its disulfide bonds were reduced by dithiothreitol. By applying osmotic stress, the swelling could be reversed. DNA-containing virus-like particles behaved in a similar way. The results provide insight into the structural role of calcium ions and disulfide bonds in holding the capsid proteins in compact conformation.

Original languageAmerican English
Pages (from-to)58-64
Number of pages7
JournalACS Omega
Issue number1
StatePublished - 2 Jan 2019

Bibliographical note

Publisher Copyright:
© 2019 American Chemical Society.


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