James Holton wrote:
I think the definition of a "coiled coil" is that the helices are symmetric (Crick 1953).
This is only true for parallel in register coiled coils. There are many coiled coils that are antiparallel, see e.g. the SOCKET database at http://www.lifesci.sussex.ac.uk/research/woolfson
Best wishes, Sergei
