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Boerdijk-Coxeter helix and biological helices
J. F. Sadoc1a and N. Rivier2
Laboratoire de Physique des Solides (associé au CNRS) ,
bâtiment 510, Université de Paris-Sud 91405 Orsay Cedex, France
2 Laboratoire de Dynamique des Fluides Complexes (associé au CNRS) , 3 rue de l'Université, Université Louis Pasteur, 67084 Strasbourg, France
Corresponding author: a email@example.com
Revised: 12 April 1999
Published online: 15 November 1999
Helices and dense packing of spherical objects are two closely related problems. For instance, the Boerdijk-Coxeter helix, which is obtained as a linear packing of regular tetrahedra, is a very efficient solution to some close-packing problems. The shapes of biological helices result from various kinds of interaction forces, including steric repulsion. Thus, the search for a maximum density can lead to structures related to the Boerdijk-Coxeter helix. Examples are presented for the -helix structure in proteins and for the structure of the protein collagen, but there are other examples of helical packings at different scales in biology. Models based on packing efficiency related to the Boerdijk-Coxeter helix, explain, mainly from topological arguments, why the number of amino acids per turn is close to 3.6 in -helices and 2.7 in collagen.
PACS: 87.10.+e – General theory and mathematical aspects / 36.20.-r – Macromolecules and polymer molecules
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999