Fig. 8: PPII helix orientation impacts HBS.
From: Orientation affects hydrogen bonding cooperativity in polyproline II helical bundles
HBS between the parallel and/or antiparallel PPII helices of the four different 3D computational models. The PDPR arrangement is indicated in purple; the PDAR arrangement, in magenta, the ADPR arrangement, in orange, and the ADAR arrangement, in gray.
