Chemistry of Life, The Journey of a Carbon Atom
By coiling, you get the Alpha Helix structure and now you can get your R group
Image (http://cbm.msoe.edu/teachingResources/proteinStructure/assets/images/alphaHelix.jpg)
Image (http://cbm.msoe.edu/teachingResources/proteinStructure/assets/images/alphaHelix.jpg)