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Journal of Biological Physics

, Volume 39, Issue 2, pp 215–228 | Cite as

Statistical analysis of sizes and shapes of virus capsids and their resulting elastic properties

  • Anže Lošdorfer BožičEmail author
  • Antonio Šiber
  • Rudolf Podgornik
Original Paper

Abstract

From the analysis of sizes of approximately 130 small icosahedral viruses we find that there is a typical structural capsid protein, having a mean diameter of 5 nm and a mean thickness of 3 nm, with more than two thirds of the analyzed capsid proteins having thicknesses between 2 nm and 4 nm. To investigate whether, in addition to the fairly conserved geometry, capsid proteins show similarities in the way they interact with one another, we examined the shapes of the capsids in detail. We classified them numerically according to their similarity to sphere and icosahedron and an interpolating set of shapes in between, all of them obtained from the theory of elasticity of shells. In order to make a unique and straightforward connection between an idealized, numerically calculated shape of an elastic shell and a capsid, we devised a special shape fitting procedure, the outcome of which is the idealized elastic shape fitting the capsid best. Using such a procedure we performed statistical analysis of a series of virus shapes and we found similarities between the capsid elastic properties of even very different viruses. As we explain in the paper, there are both structural and functional reasons for the convergence of protein sizes and capsid elastic properties. Our work presents a specific quantitative scheme to estimate relatedness between different proteins based on the details of the (quaternary) shape they form (capsid). As such, it may provide an information complementary to the one obtained from the studies of other types of protein similarity, such as the overall composition of structural elements, topology of the folded protein backbone, and sequence similarity.

Keywords

Capsid Virus Geometry Icosahedron Faceting Elasticity 

Notes

Acknowledgements

We thank Alberto Vianelli for informing us about [20]. We also thank the two anonymous reviewers for their suggestions on improving the manuscript. A.L.B. acknowledges the support from the Slovene Agency for Research and Development under the young researcher grant. A.Š. acknowledges support from the Ministry of Science, Education, and Sports of Republic of Croatia (Grant No. 035-0352828-2837). R.P. acknowledges the support from the Slovene Agency for Research and Development (Grant No. P1-0055 and J1-4297).

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Anže Lošdorfer Božič
    • 1
    Email author
  • Antonio Šiber
    • 2
  • Rudolf Podgornik
    • 1
    • 3
  1. 1.Department of Theoretical PhysicsJožef Stefan InstituteLjubljanaSlovenia
  2. 2.Institute of PhysicsZagrebCroatia
  3. 3.Department of PhysicsFaculty of Mathematics and PhysicsLjubljanaSlovenia

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